Toyota Avalon (XX50): Tire Pressure Warning System(for Gasoline Model)

Tire Pressure Monitor Receiver Communication Stop (B1247)

DESCRIPTION

The main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver communicate by direct line. If a malfunction occurs in this communication signal, B1247 is output by the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.
• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

  Click here

PROCEDURE

(a) Using an oscilloscope, check the waveform. NOTICE: With the connector connected, check from the backside of the connector. Standard Voltage: Tester Connection Tool Setting Range Condition Specified Condition K11-4 (RDA) - Body ground 5 V/DIV.5 ms./DIV. Engine switch on (IG) Waveform generation

*a Component with harness connected (Tire Pressure Warning ECU and Receiver) *b GND

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

B

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

C

(a) Disconnect the K11 tire pressure warning ECU and receiver connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

(a) Turn the engine switch off.

(b) Disconnect the G34 main body ECU (multiplex network body ECU) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Transmitter ID1 Operation Stop (C2111-C2114)

DESCRIPTION

The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of each wheel. The measured values are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. The ECU compares the measured tire pressure values with the tire pressure threshold. When the measured tire pressure value is less than this threshold, the warning light in the combination meter assembly illuminates. The tire pressure warning ECU and receiver stores a DTC when the tire pressure warning valve and transmitter stops transmitting signals. The signals can be forcibly transmitted by releasing the tire pressure rapidly. The stored DTCs are cleared when signal transmission resumes.

HINT:

It is necessary to perform the following procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.

WIRING DIAGRAM

PROCEDURE

(a) Set the tire pressure to the specified value.

Click here

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(g) Read the Data List according to the display on the Techstream.

HINT:

*1: It may take a few minutes until the values are displayed. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121 to C2124.

Click here

(h) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.

(1) Check that each "ID Tire Inflation Pressure" value displayed on the Techstream has changed.

OK:

Each "ID Tire Inflation Pressure" value displayed on the Techstream changed to the actual tire inflation pressure value.

NOTICE:

• It may take a few minutes until the values are displayed.
• When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.

(2) After confirming that all of the tire "ID Tire Inflation Pressure" values displayed on the Techstream have changed, set the tire pressure to the appropriate specified values.

HINT:

If an "ID Tire Inflation Pressure" value displayed on the Techstream has not changed after rechecking, inspect for another problem.

Click here

OK

END

NG

GO TO TRANSMITTER AND RECEIVER INSPECTION PROCEDURE

Transmitter ID 1 not Received (Main) (C2121-C2124,C2181-C2184)

DESCRIPTION

The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of each wheel. The measured values are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. The ECU compares the measured tire pressure values with the tire pressure threshold. When the measured tire pressure value is less than this threshold, the warning light in the combination meter assembly illuminates.

The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning ECU and receiver.

Under the conditions below, the tire pressure warning ECU and receiver is unable to receive the signals from the tire pressure warning valve and transmitters, and a DTC is stored.

• Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
• Devices using similar radio frequencies are used in the vehicle.
• The ID of a tire pressure warning valve and transmitter is mistyped during registration.
• A tire, wheel and/or transmitter from a different vehicle is installed.

HINT:

When no transmitter ID is received from a tire pressure warning valve and transmitter for 20 minutes or more while the vehicle speed is more than 40 km/h (25 mph), or no transmitter ID is received from all of the tire pressure warning valve and transmitters for 20 minutes or more, DTCs from C2121 to C2124 are stored.

DTCs C2121 to C2124 can only be cleared by using the Techstream. DTCs C2181 to C2184 can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs C2181 to C2184 are output only in test mode.

NOTICE:

• When DTCs C2121 to C2124 are stored, DTC C2179 may be stored simultaneously. In such cases, troubleshoot DTCs C2121 to C2124 first, then troubleshoot DTC C2179.
• If the Techstream is used to display the Data List for 10 minutes or more, the tire pressure warning ECU stores DTCs C2121, C2122, C2123 and C2124. If these DTCs are stored, clear the DTCs using the Techstream.
• If any DTC from C2121 to C2124 is output, clear the DTCs or drive the vehicle at 40 km/h (25 mph) for 1 minute or more after repairing the malfunctions.

HINT:

It is necessary to perform the following procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver or tire pressure warning valve and transmitter, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU and/or one of the valve and transmitters has been replaced.

PROCEDURE

(a) Check that the following conditions are not met:

(1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

HINT:

If the vehicle is located in an area such as the one described above, the tire pressure warning light may illuminate after blinking for 1 minute due to interfering radio frequencies.

(2) Devices using similar radio frequencies are used in the vehicle.

HINT:

Radio transmissions may be interrupted due to the surroundings or devices installed by the user.

B

GO TO STEP 10

A

(a) Check the stored DTC.

B

GO TO STEP 5

A

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Display the "ID Tire Position" value for each wheel using the Techstream.

(g) Refer to the following chart and check the wheel position of the DTC and transmitter match.

HINT:

Refer to the following chart for the Data List items that correspond to the DTCs.

NEXT

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Refer to the following chart and record the tire pressure warning valve and transmitter ID of the output DTC.

HINT:

• *1: Displayed only when the ID No. is not registered.
• Refer to the following chart for the Data List items that correspond to the DTCs.

  DTC No.	Detection Item	Data List
  C2121	Transmitter ID 1 not Received (Main)	Registered ID 1 code
  C2181	Transmitter ID 1 not Received (for Test Diagnosis)
  C2122	Transmitter ID 2 not Received (Main)	Registered ID 2 code
  C2182	Transmitter ID 2 not Received (for Test Diagnosis)
  C2123	Transmitter ID 3 not Received (Main)	Registered ID 3 code
  C2183	Transmitter ID 3 not Received (for Test Diagnosis)
  C2124	Transmitter ID 4 not Received (Main)	Registered ID 4 code
  C2184	Transmitter ID 4 not Received (for Test Diagnosis)

(g) Disassemble the tire indicated in the output DTC and check the tire pressure warning valve and transmitter ID.

NOTICE:

For vehicles equipped with the wheel speed type tire inflation pressure display function, be sure to use tire pressure warning valve and transmitters with identification marks.

(h) Confirm that the ID number on the transmitter and recorded transmitter ID match.

A

REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

B

GO TO STEP 7

(a) Perform a test mode inspection and perform Transmitter Data Reception Check (C2181 to C2184).

Click here

OK

END

NG

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Refer to the following chart and record all of the tire pressure warning valve and transmitter IDs.

HINT:

• *1: Displayed only when the ID No. is not registered.
• The wheel position cannot be determined from ID1 through ID4 on the Data List.

(g) Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.

NOTICE:

For vehicles equipped with the wheel speed type tire inflation pressure display function, be sure to use tire pressure warning valve and transmitters with identification marks.

(h) Confirm that the ID number on the transmitter and recorded transmitter ID match.

A

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

B

(a) Perform registration.

Click here

NEXT

(a) Perform initialization.

Click here

NEXT

(a) Clear the DTCs.

NEXT

END

(a) Clear the DTCs.

NEXT

END

Transmitter ID not Received (Main) (C2126)

DESCRIPTION

If ID registration via the automatic ID registration function is canceled or the tire pressure warning ECU and receiver does not receive data from the tire pressure warning valve and transmitters after the tire pressure warning valve and transmitter ID registration is completed using the Techstream, the tire pressure warning ECU and receiver stores DTC C2126.

After ID registration is complete using the Techstream, the tire pressure warning light illuminates after blinking for 1 minute. When the tire pressure warning ECU and receiver receives the data from all tire pressure warning valve and transmitters with registered IDs, the tire pressure is judged to be normal and the tire pressure warning light turns off.

NOTICE:

If DTC C2126 is stored, C2128 may also be stored. If DTC C2128 is stored, perform troubleshooting for DTC C2128 before performing troubleshooting for DTC C2126.

HINT:

The purpose of this DTC is to help prevent delivering a vehicle that has incorrectly registered transmitter IDs. After all IDs are registered, DTC C2126 is detected and the tire pressure warning light blinks for 1 minute and then illuminates. If the tire pressure warning light does not go off after a little while, the transmitter IDs may be incorrectly registered.

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver or tire pressure warning valve and transmitter, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU and/or one of the valve and transmitters has been replaced.

PROCEDURE

(a) Set the tire pressure to the specified value.

Click here

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(g) Display the "ID Tire Inflation Pressure" value for each wheel using the Techstream.

HINT:

• *1: It may take a few minutes until the values are displayed.
• The wheel position cannot be determined from ID1 through ID4 on the Data List.

(h) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kg/cm2, 5.8 psi) within 30 seconds. If the "ID Tire Inflation Pressure" value displayed on the Techstream does not change, the tire pressure warning valve and transmitter corresponding to the unchanged "ID Tire Inflation Pressure" value was the cause of the output DTC.

HINT:

• Identify the malfunctioning tire pressure warning valve and transmitter by repeatedly decreasing the tire pressure for each tire.
• Record which "ID Tire Inflation Pressure" value corresponds to each tire.

(i) Check the Data List.

NOTICE:

• It may take a few minutes until the values are displayed.
• When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.
• Record the transmitter IDs and positions of transmitters that are normal.

(j) After confirming that the "ID Tire Inflation Pressure" value for one tire has changed, repeat this procedure one by one. Identify the transmitter not received.

A

END

C

GO TO STEP 3

B

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Read the Data List according to the display on the Techstream.

HINT:

• *1: Displayed only when the ID No. is not registered.
• The wheel position cannot be determined from ID1 through ID4 on the Data List.

(g) Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.

NOTICE:

For vehicles equipped with the wheel speed type tire inflation pressure display function, be sure to use tire pressure warning valve and transmitters with identification marks.

(h) Confirm that the ID number on the transmitter and recorded transmitter ID match.

A

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

B

GO TO STEP 4

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Read the Data List according to the display on the Techstream.

HINT:

• *1: Displayed only when the ID No. is not registered.
• The wheel position cannot be determined from ID1 through ID4 on the Data List.

(g) Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.

NOTICE:

For vehicles equipped with the wheel speed type tire inflation pressure display function, be sure to use tire pressure warning valve and transmitters with identification marks.

(h) Confirm that the ID number on the transmitter and recorded transmitter ID match.

A

REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

B

(a) Perform registration.

Click here

NEXT

(a) Perform initialization.

Click here

NEXT

END

Auto ID Under Registration (C2128)

DESCRIPTION

When ID registration is being performed via the automatic ID registration function, the tire pressure warning ECU and receiver stores C2128 and the tire pressure warning light flashes for 1 minute and then illuminates.

When the tire pressure warning ECU receives data from all registered tire pressure warning valve and transmitters and the system is judged to be normal, the tire pressure warning light turns off.

PROCEDURE

(a) Turn the engine switch on (IG).

(b) Check if the electronically controlled brake system DTCs are output.

HINT:

If DTC C2128 is stored, electronically controlled brake system DTCs may also be stored. If electronically controlled brake system DTCs are stored, perform troubleshooting for the electronically controlled brake system before performing ID registration via the automatic ID registration function.

B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

A

(a) Turn the engine switch off.

(b) Turn the engine switch on (IG).

(c) Perform ID registration for the tire pressure warning ECU and receiver (ID registration via the automatic ID registration function).

Click here

HINT:

Perform the following procedures within 1 trip and do not turn the engine switch off.

NEXT

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(d) According to the display on the Techstream, display the ECU Data List.

(e) Refer to the following chart and check the "[RAM] Auto ID Registered Wheel Judgment Status" of each transmitter.

B

GO TO STEP 5

A

(a) Perform ID registration for the tire pressure warning ECU and receiver (ID registration via Techstream).

Click here

NEXT

END

(a) Perform ID registration for the tire pressure warning ECU and receiver (ID registration via Techstream).

Click here

NEXT

END

Transmitter ID1 Error (C2141-C2144)

DESCRIPTION

The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of each wheel. The measured values are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. The ECU compares the measured tire pressure values with the tire pressure threshold. When the measured tire pressure value is less than this threshold, the warning light in the combination meter assembly illuminates.

When the internal circuit of a tire pressure warning valve and transmitter is malfunctioning, one of these DTCs is output.

HINT:

It is necessary to perform the following procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning valve and transmitter, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if one of the valve and transmitters has been replaced.

PROCEDURE

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Display the "ID Tire Position" value for each wheel using the Techstream.

(g) Refer to the following chart and check the wheel position of the DTC and transmitter match.

HINT:

Refer to the following chart for the Data List items that correspond to the DTCs.

NEXT

REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

Transmitter ID not Registered (Main) (C2171)

DESCRIPTION

The IDs of each tire pressure warning valve and transmitter are registered to the tire pressure warning ECU and receiver.

When the ECU detects that a transmitter ID code is not registered in the ECU, this DTC is stored.

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Read the Data List according to the display on the Techstream.

HINT:

*1: Displayed only when the ID No. is not registered.

OK:

The registered transmitter ID codes are displayed on the Techstream.

OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

(a) Perform registration.

Click here

NEXT

(a) Perform initialization.

Click here

NEXT

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Read the Data List according to the display on the Techstream.

HINT:

• *1: It may take a few minutes until the values are displayed.
• When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.

A

END

B

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

Receiver Error (C2176)

DESCRIPTION

Tire pressure warning valve and transmitter signals are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves.

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

(a) Clear the DTCs.

(b) Turn the engine switch off.

(c) Turn the engine switch on (IG) and check for DTCs.

A

END

B

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

Initialization not Completed (C2177)

DESCRIPTION

Initialization is necessary if one of the following occurs:

• The tire pressure warning ECU and receiver is replaced.
• A tire pressure warning valve and transmitter is replaced.
• Tires with different standard tire pressures are installed.
• The tires are rotated.
• A new vehicle is delivered.

Tire pressure warning initialization is performed when the engine switch is on (IG), "Set Pressure" is selected on the multi-information display and the "OK" switch (steering pad switch assembly) is pressed and held.

When an initialization request signal is received, the tire pressure warning ECU and receiver blinks the tire pressure warning light in the combination meter assembly 3 times and registers the tire pressure information sent from the tire pressure warning valve and transmitters.

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver or tire pressure warning valve and transmitter, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU and/or one of the valve and transmitters has been replaced.
• If initialization is performed using the Techstream when the Data List is displayed for 10 minutes or more, initialization will not complete and the tire pressure warning ECU and receiver stores DTC C2177.

PROCEDURE

(a) Check that the following conditions are not met:

(1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

HINT:

If the vehicle is located in an area such as the one described above, the tire pressure warning light may illuminate after blinking for 1 minute due to interfering radio frequencies.

(2) Devices using similar radio frequencies are used in the vehicle.

OK:

Facilities or devices that use similar radio frequencies are not located in the vicinity of the vehicle.

HINT:

Radio transmissions may be interrupted due to the surroundings, or devices installed by the user.

NG

CHECK IF ANY DEVICE IS INSTALLED BY USER

OK

(a) Perform initialization.

Click here

NEXT

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Read the Data List according to the display on the Techstream.

HINT:

• *1: It may take a few minutes until the values are displayed.
• When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.

A

END

B

GO TO DTC (C2121 TO C2124)

Vehicle Speed Information Communication Lost (C2178)

DESCRIPTION

The tire pressure warning ECU and receiver receives signals from the combination meter assembly via CAN communication. If a malfunction occurs in this communication line, DTC C2178 is output.

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

(a) Perform On-vehicle Inspection of the meter/gauge system.

Click here

HINT:

Check the meter function by referring to On-vehicle Inspection for the combination meter assembly.

A

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

B

GO TO METER / GAUGE SYSTEM

Tire Pressure Monitor ECU Communication Stop (C2179)

DESCRIPTION

The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.
• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

  Click here

PROCEDURE

(a) Using an oscilloscope, check the waveform. NOTICE: With the connector connected, check from the backside of the connector. Standard Voltage: Tester Connection Tool Setting Range Condition Specified Condition G34-11 (PRG) - Body ground 5 V/DIV.5 ms./DIV. Engine switch on (IG) Waveform generation

*a Component with harness connected (Main Body ECU (Multiplex Network Body ECU)) *b GND

A

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

C

(a) Disconnect the G34 main body ECU (multiplex network body ECU) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

(a) Turn the engine switch off.

(b) Disconnect the K11 tire pressure warning ECU and receiver connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Initialization Switch Error (for Test Diagnosis) (C2198)

DESCRIPTION

The switch circuit inside the combination meter assembly turns on and off according to the steering pad switch assembly operation.

During test mode, the tire pressure warning light blinks at 0.125 second intervals when "Set Pressure" is selected on the multi-information display, and illuminates when the "OK" switch (steering pad switch assembly) is pressed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

(a) Remove the steering pad switch assembly.

Click here

(b) Inspect the steering pad switch assembly.

Click here

NG

REPLACE STEERING PAD SWITCH ASSEMBLY

OK

(a) Remove the spiral cable sub-assembly.

Click here

(b) Inspect the spiral cable sub-assembly.

Click here

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK

(a) Disconnect the G17 spiral cable sub-assembly connector.

(b) Disconnect the G16 combination meter assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Disconnect the K11 tire pressure warning ECU and receiver connector.

(b) Disconnect the G16 combination meter assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Connect the K11 tire pressure warning ECU and receiver connector.

(b) Disconnect the G16 combination meter assembly connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

OK

GO TO METER / GAUGE SYSTEM

NG

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

Cannot Switch to Automatic ID Registration Mode

DESCRIPTION

When "Change Wheel" is selected on the multi-information display and the "OK" switch (steering pad switch assembly) is pushed and held, the system enters ID registration mode and the tire pressure warning light blinks 3 times.

The main body ECU (multiplex network body ECU) receives signals from the combination meter assembly via the CAN communication line.

WIRING DIAGRAM

PROCEDURE

(a) Perform Test Mode Procedure (Tire Pressure Warning Reset Switch Check (DTC C2198)).

Click here

NEXT

GO TO DTC C2198

Data List / Active Test

DATA LIST / ACTIVE TEST

READ DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) According to the display on the Techstream, read the Data List.

HINT:

• *1: Displayed only when the ID No. is not registered.
• *2: It may take a few minutes until the values are displayed. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121 to C2124.

  Click here

• *3: This item is displayed on the Techstream, however, it is not used for this vehicle.

PERFORM ACTIVE TEST

Using the Techstream to perform Active Tests allows the relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(f) Perform the Active Test according to the display on the Techstream.

Diagnosis System

DIAGNOSIS SYSTEM

CHECK WARNING LIGHT

NOTICE:

• When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals, and illuminates after 1 minute.
• When the malfunction has been corrected, the tire pressure warning light goes off.
• When the tire pressure warning light illuminates, immediately check the tire pressure of the tires and adjust them to the specified value.
• After the engine switch is turned on (IG), the tire pressure warning light illuminates for 3 seconds and then goes off. If the warning light does not illuminate for 3 seconds, proceed to the troubleshooting for the tire pressure warning light circuit.

  Click here

(a) Turn the engine switch on (IG).

(b) Check that the tire pressure warning light illuminates for 3 seconds.

WHAT TO CONSIDER WHEN TIRE PRESSURE WARNING LIGHT ILLUMINATES

(a) When the tire pressure warning light does not go off, or when it illuminates during driving, check the tire pressure. If the tire pressure warning light illuminates within several hours after adjusting the tire pressure, a tire may have a slow air leak.

(b) The system is disabled under the following conditions (when the condition returns to normal, the system will work properly).

(1) When all of the tire and wheel assemblies that have tire pressure warning valve and transmitters registered with the tire pressure warning ECU and receiver have not been installed.

(2) When all of the transmitter ID codes are not registered with the tire pressure warning ECU and receiver.

(3) When the tire pressure warning valve and transmitter battery is depleted (Battery life is 10 years).

(c) The system may become disabled under the following conditions (when the condition returns to normal, the system will work properly).

(1) When electric devices or facilities using similar radio frequencies are nearby.

(2) When a wireless device or other equipment operating at a similar frequency is in use in the vehicle.

(3) When a window tint that affects radio wave signals is installed.

(4) When there is a lot of snow or ice on the vehicle, in particular, around the wheels or wheel housing.

(5) When non-genuine wheels are used.

(6) When tire chains are used.

(7) When aftermarket tire repair sealant is used.

CAUTION:

After use of tire repair sealant, replacement of the tire pressure warning valve and transmitter is required to ensure normal system operation. (Normal system operation cannot be ensured by only repairing or replacing the tire.)

TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART

HINT:

The table below indicates the state of the tire pressure warning light after the engine switch is turned on (IG).

• *1: Blinks at 0.5 second intervals, and remains illuminated after 1 minute.

  *a	ON
  *b	OFF
  *c	0.5 sec.
  *d	1 minute

• *2: Blinks at 0.125 second intervals.

  *a	ON
  *b	OFF
  *c	0.125 sec.

• *3: Blinks 3 times at 1 second intervals.

  *a	ON
  *b	OFF
  *c	1 sec.

• *4: Goes off for 10 seconds to check the connection of the ECU connector, and then blinks at 0.5 second intervals, and remains illuminated after 1 minute.

  *a	ON
  *b	OFF
  *c	0.5 sec.
  *d	1 minute
  *e	10 sec.

NORMAL MODE DTC

(a) DTCs are stored in the tire pressure warning ECU and receiver and output by blinking the tire pressure warning light or by using the Techstream.

Click here

TEST MODE (SIGNAL CHECK MODE) DTC

(a) By switching from normal mode into test mode (signal check mode), the tire pressure warning ECU and receiver, each tire pressure warning valve and transmitter and tire pressure warning reset switch can be inspected.

Click here

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK DTC (for TIRE PRESSURE WARNING ECU AND RECEIVER)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Trouble Codes.

(f) Read the DTCs.

CHECK DTC (for MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(f) Read the DTCs.

CLEAR DTC (for TIRE PRESSURE WARNING ECU AND RECEIVER)

HINT:

After repairing the malfunctions, clear the DTCs.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Trouble Codes.

(f) Clear the DTCs following the prompts on the Techstream screen.

HINT:

Refer to the Techstream operator's manual for further details.

CLEAR DTC (for MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

HINT:

After repairing the malfunctions, clear the DTCs.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(f) Clear the DTCs following the prompts on the Techstream screen.

HINT:

Refer to the Techstream operator's manual for further details.

Fail-safe Chart

FAIL-SAFE CHART

FAIL-SAFE FUNCTION

(a) When a malfunction occurs in the tire pressure warning system, the tire pressure warning light illuminates after blinking for 1 minute to inform the driver of the system failure.

(b) As a result of this, tire pressure monitoring is disabled and a DTC is stored in the tire pressure warning ECU and receiver.

(c) When there is a system malfunction, the value of each related tire is not displayed.

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

• Use the following procedure to troubleshoot the tire pressure warning system.
• Make sure that the wireless door lock control system has exited diagnostic mode before performing the following procedure.
• *: Use the Techstream.

PROCEDURE

NEXT

(a) Interview the customer to confirm the problem.

HINT:

It is important to collect as much specific information as possible from the customer to allow for a quick repair.

NEXT

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Set all tire pressures to the specified value.

NOTICE:

Refer to the link as the procedure for adjusting the tire pressures differs depending on the temperature of the tires.

Click here

(g) Display "ID Tire Inflation Pressure" in the Data List and check that the tire pressure values match the adjusted pressure amount.

HINT:

It may take a few minutes until the values are displayed.

(h) Perform initialization.

Click here

HINT:

The tire pressure warning system illuminates the tire pressure warning light to warn the driver when any of the following condition is met:

• The tire pressure drops to approximately 75% or less of the tire pressure set when system initialization was performed using the steering pad switch assembly.

B

GO TO STEP 11

A

(a) Check the ECUs connected to the CAN bus.

Click here

B

GO TO CAN COMMUNICATION SYSTEM

A

(a) Check for DTCs.

Click here

B

GO TO CAN COMMUNICATION SYSTEM

A

(a) Check for DTCs.

Click here

B

GO TO STEP 8

A

(a) Refer to Diagnostic Trouble Code Chart.

Click here

NEXT

GO TO STEP 10

(a) Refer to Problem Symptoms Table.

Click here

NEXT

(a) Refer to Electronic Circuit Inspection Procedure.

Click here

NEXT

(a) Repair or replace parts based on the diagnosis result.

NEXT

(a) Check the Data List to confirm that the tire inflation pressure has been received.

Click here

(b) Perform initialization.

Click here

(c) Confirm that the initialization has been completed.

NEXT

END

Initialization

INITIALIZATION

NOTICE:

• Initialization can be confirmed through the tire pressure warning light.
• If the engine switch is turned off during initialization, the tire pressure warning ECU and receiver memorizes that initialization was being performed. Therefore, it is not necessary to perform the initialization procedure again after turning the engine switch on (IG).
• The order in which the data is received is random.
• If the signals from all the tire pressure warning valve and transmitters are received, initialization is completed.
• Initialization is completed when the Data List "ID Tire Inflation Pressure" display shows the correct pressures.

  Click here

• Initialization is normally completed within a few minutes.

  However, it may take 10 minutes or more until the tire pressure of the tire inflation pressure display function is shown (Tire Inflation Pressure Display Function).

• It may take a few minutes until the values are displayed. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121 to C2124.

  Click here

• If initialization has not been completed successfully, DTC C2177 is stored after a vehicle speed of 40 km/h (25 mph) or more is detected for 20 minutes or more.
• During test mode (sensor check mode), the system will not change to initialization mode even if the initialization procedure is performed.
• If initialization is performed, the existing tire positions will be cleared, but will be automatically identified when the vehicle is driven at 40 km/h (25 mph) or more for 10 to 30 minutes (Tire Inflation Pressure Display Function).
• If the Data List is displayed for 10 minutes or more using the Techstream during initialization, initialization will not complete and the tire pressure warning ECU and receiver will store DTC C2177.

BEFORE INITIALIZATION

(a) Set the tire pressure to the specified value.

NOTICE:

Refer to the link as the procedure for adjusting the tire pressures differs depending on the temperature of the tires.

Click here

HINT:

The tire pressure warning system illuminates the tire pressure warning light to warn the driver when any of the following condition is met:

• The tire pressure drops to approximately 75% or less of the tire pressure set when system initialization was performed using the steering pad switch assembly.

INITIALIZATION PROCEDURE

(a) Turn the engine switch on (IG).

(b) Select "Set Pressure" on the multi-information display and press and hold the "OK" switch (steering pad switch assembly) until the tire pressure warning light blinks 3 times.

(c) Turn the engine switch off.

(d) Connect the Techstream to the DLC3.

(e) Turn the engine switch on (IG).

(f) Turn the Techstream on.

(g) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

HINT:

• *1: It may take a few minutes until the values are displayed.
• The wheel position cannot be determined from ID1 through ID4 on the Data List.

(h) Check that initialization has been completed.

(i) Confirm that the tire pressure data of all tires is displayed on the Techstream screen.

Operation Check

OPERATION CHECK

CHECK TIRE PRESSURE WARNING SYSTEM FUNCTION

(a) Using the Data List, check that the current tire pressure is normal.

Click here

(1) Slowly reduce the tire pressure of the front or rear tires and check that the tire pressure on the Data List changes.

(2) Further reduce the tire pressure and check that the warning light illuminates.

(b) After reducing the tire pressure, set the tire pressure to the specified value.

Click here

Parts Location

PARTS LOCATION

ILLUSTRATION

ILLUSTRATION

ILLUSTRATION

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

TIRE PRESSURE WARNING ECU AND RECEIVER EXPRESSIONS

(a) The electrical key and tire pressure monitoring system receiver assembly is referred to as the tire pressure warning ECU and receiver in this section.

TIRE PRESSURE WARNING SYSTEM PRECAUTION

(a) Tire pressure decreases naturally over time, which also occurs in vehicle models without a tire pressure warning system.

HINT:

Tire pressure decreases by approximately 5 kPa (0.05 kgf/cm2, 0.7 psi) to 10 kPa (0.1 kgf/cm2, 1.5 psi) per month.

(b) It is necessary for the tire pressures to be adjusted periodically.

(c) In winter, tire pressure may decrease due to low ambient temperatures (tire pressure decreases by approximately 10 kPa (0.1 kgf/cm2, 1.5 psi) for every 10°C (18°F) drop in the ambient temperature). Therefore, the tire pressure warning system is more likely to indicate a warning if the tire pressures are not adjusted appropriately. If the daily temperature variation is large, increase the pressure of the tires so that the tire pressures are suitable under cold conditions. As a result, unnecessary tire pressure warning operations should decrease.

(d) Depending on the tire type, the system may not function properly even if the specified wheels are used.

(e) To prevent damage to the tire pressure warning valve and transmitter, make sure that the tire pressure warning valve and transmitter does not interfere with the tire bead when installing or removing a tire.

(f) To prevent damage to the tire pressure warning valve and transmitter, before disengaging the tire bead or removing the tire from the wheel, drop the tire pressure warning valve and transmitter into the wheel.

(g) Always use a new grommet and valve core when installing a tire pressure warning valve and transmitter to ensure the sealing performance.

(h) When replacing the tire pressure warning valve and transmitter, all tire pressure warning valve and transmitter ID codes and the amount of tires with transmitters must be registered to the tire pressure warning ECU and receiver. Even when replacing only one of the tire pressure warning valve and transmitters, all tire pressure warning valve and transmitter ID codes and the amount of tires with transmitters must be re-registered.

Make sure to record the current ID codes and already registered tires with transmitters (4 or 5) before performing registration for new ID codes and tires with transmitters.

(i) Use only a specified cap. If an unspecified cap is used, it may seize to the tire pressure warning valve and transmitter.

(j) The system is disabled under the following conditions (when the condition returns to normal, the system will work properly).

(1) When all of the tire and wheel assemblies that have tire pressure warning valve and transmitters registered with the tire pressure warning ECU and receiver have not been installed.

(2) When all of the transmitter ID codes are not registered with the tire pressure warning ECU and receiver.

(3) When the tire pressure warning valve and transmitter battery is depleted (Battery life is 10 years).

(k) The system may become disabled under the following conditions (when the condition returns to normal, the system will work properly).

(1) When electric devices or facilities using similar radio frequencies are nearby.

(2) When a wireless device or other equipment operating at a similar frequency is in use in the vehicle.

(3) When a window tint that affects radio wave signals is installed.

(4) When there is a lot of snow or ice on the vehicle, in particular, around the wheels or wheel housing.

(5) When non-genuine wheels are used.

(6) When tire chains are used.

(7) When aftermarket tire repair sealant is used.

CAUTION:

After use of tire repair sealant, replacement of the tire pressure warning valve and transmitter is required to ensure normal system operation. (Normal system operation cannot be ensured by only repairing or replacing the tire.)

(l) Tire Inflation Pressure Display Function:

(1) The tire inflation pressure display function displays the position and pressure of each tire on the multi-information display. If the position and pressure of each tire are not displayed, the problem may be alleviated by driving the vehicle to a location where the signal reception is better.

NECESSARY PROCEDURES WHEN REPLACING PARTS

(a) ID Registration

When replacing the tire pressure warning valve and transmitter and tire pressure warning ECU and receiver, perform ID registration for the tire pressure warning valve and transmitter.

Click here

(b) Initialization

After performing ID registration for the tire pressure warning valve and transmitter, make sure to initialize the tire pressure warning system.

Click here

(c) Tire Inflation Pressure Display Function:

Tire Position Identification

After performing ID registration for the tire pressure warning valve and transmitter and initializing the tire pressure warning system, perform tire position identification.

Click here

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

• Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
• Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Registration

REGISTRATION

PROCEDURE

1. BEFORE REGISTRATION

NOTICE:

• The transmitter ID is written on the tire pressure warning valve and transmitter. It is not possible to read the transmitter ID after installing the tire onto the wheel. Therefore, make a note of the transmitter ID before installing the tire.
• Make sure to perform ID registration using the Techstream after replacing the tire pressure warning ECU and receiver.

(a) When replacing the tire pressure warning ECU and receiver:

(1) When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.

(2) If reading the stored transmitter IDs is impossible due to malfunctions of components such as the tire pressure warning ECU and receiver, remove the tires from the wheels and check the IDs located on the tire pressure warning valve and transmitters.

(b) When replacing a tire pressure warning valve and transmitter:

(1) Take a note of the 7-digit number (transmitter ID) written on the tire pressure warning valve and transmitter.

NOTICE:

For vehicles equipped with the wheel speed type tire inflation pressure display function, be sure to use tire pressure warning valve and transmitters with identification marks.

2. REGISTER TRANSMITTER ID (USING TECHSTREAM)

HINT:

• The previously registered IDs will be cleared from memory when registration is completed.
• If the ID registration step is not completed within 300 seconds, ID registration will be canceled.

(a) Set the tire pressure to the specified value.

Click here

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / Tire Pressure Monitor / Utility / ID Registration/Tire Number Registration.

(g) Perform the procedure displayed on the Techstream.

HINT:

The number of registered tire pressure warning valve and transmitters can only be set to 4 when the value is currently set to 5. The number of registered tire pressure warning valve and transmitters should only be changed from the default value when requested by the customer.

3. CONFIRMATION OF TRANSMITTER ID REGISTRATION (USING TECHSTREAM)

NOTICE:

• It may take a few minutes until the values are displayed. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121 to C2124.

  Click here

• If the transmitter IDs have not been registered, DTC C2171 is stored in the tire pressure warning ECU and receiver after 3 minutes or more.
• If normal pressure values are displayed, the transmitter IDs have been registered correctly.
• If the tire pressure values are not displayed after a few minutes, the transmitter IDs may be incorrect or the system may have a malfunction.
• After all transmitter IDs are registered, DTC C2126 is stored in the tire pressure warning ECU and receiver and the tire pressure warning light blinks for 1 minute and then illuminates. When the tire pressure warning ECU and receiver successfully receives signals from all the transmitters whose IDs are stored in the ECU, DTC C2126 is cleared and the tire pressure warning light goes off.

(a) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

HINT:

*1: It may take a few minutes until the values are displayed. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121 to C2124.

(b) Reduce the tire inflation pressure of each tire 40 kPa (0.4 kgf/cm2, 5.8 psi) or more, and check that the "ID Tire Inflation Pressure" data is updated and that the actual tire inflation pressures are displayed.

(c) After confirming that all of the tire inflation pressure values (except the compact spare tire) have been updated, adjust the tire inflation pressure to the specified value, operate the steering pad switch assembly and perform initialization.

4. REGISTER TRANSMITTER ID (USING AUTOMATIC ID REGISTRATION FUNCTION)

NOTICE:

• If the automatic ID registration operation is canceled while registration is being performed, DTC C2126 is stored in the tire pressure warning ECU and receiver.
• If the automatic ID registration is started while DTC C2126 is stored, DTC C2126 and C2128 are stored in the tire pressure warning ECU and receiver.
• During registration, DTC C2128 is stored by the tire pressure warning ECU and receiver and the tire pressure warning light blinks for 1 minute then illuminates. When the tire pressure warning ECU and receiver successfully receives signals from all the transmitters whose IDs are stored in the ECU, DTC C2128 is cleared and the tire pressure warning light turns off.
• If a tire pressure warning valve and transmitter of the same type is carried in the vehicle, registration may not complete.

HINT:

• When registration is complete, all previously registered IDs are cleared.
• If DTCs C2176, C2179 and U0129 are stored, registration mode cannot be entered.
• If the Techstream is being used to display the Data List, registration mode cannot be entered.
• If the Techstream is used to display the Data List during registration, registration will be canceled.
• If DTCs C2176, C2179 and U0129 are stored during registration, registration will be canceled.
• If the engine switch is turned off before the vehicle is driven after entering registration mode, registration will be canceled.

(a) Adjust the tire pressure in all tires to the specified pressure.

(b) Turn the engine switch off and stop the vehicle for 15 minutes or more.

HINT:

After stopping the vehicle for 15 minutes or more, the frequency of electrical wave signals sent by the tire pressure warning valve and transmitters increases for the first few minutes of driving (8 times the normal frequency).

(c) Select "Change Wheel" on the multi-information display and press and hold the "OK" switch (steering pad switch assembly) until the tire pressure warning light blinks 3 times.

HINT:

During registration, the tire pressure warning light blinks for 1 minute before turning on, the multi-information display tire pressure displays as "- -" and "Tire Pressure Recalibrating Please Wait until Complete" is displayed.

(d) Drive at approximately 40 km/h (25 mph) for approximately 10 to 30 minutes during 1 trip.

(e) During the procedure, make 2 or more right or left turns.

HINT:

Do not drive the vehicle in reverse during registration.

If the vehicle is driven in reverse during registration, the information may be reset before registration completes, and registration may take longer than normal to complete.

(f) When registration is completed, the tire pressure warning light turns off, the normal tire pressure is displayed on the multi-information display and "Tire Pressure Recalibrating Please Wait until Complete" stops displaying.

HINT:

• Registration may take longer than normal in the following situations.
  • The vehicle is stopped frequently
  • The vehicle is stopped for long period of time
  • The vehicle is driven in reverse
  • The vehicle is driven on rough roads or uneven surfaces
  • The vehicle is driven in close proximity to another vehicle with the same type of tire pressure warning valve and transmitter installed for a long period of time
  • The vehicle was not stopped for 15 minutes or more before registration
  • The vehicle is driven at 40 km/h (25 mph) or less for a long period of time
  • The engine switch is turned off during ID registration

5. TIRE POSITION IDENTIFICATION (USING TECHSTREAM) (Tire Inflation Pressure Display Function)

(a) Set the tire pressure to the specified value.

Click here

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

HINT:

*1: It may take a few minutes until the values are displayed.

(g) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.

NOTICE:

• It may take a few minutes until the values are displayed.
• When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.

(h) Read the "ID Tire Inflation Pressure" value and identify the tire with reduced pressure, and record the corresponding tire pressure warning valve and transmitter (ID1 to ID4).

(i) Repeat for each tire.

(j) Set the tire pressure to the specified value.

Click here

(k) Enter the following menus: Chassis / Tire Pressure Monitor / Utility / Tire Position Write.

(l) Perform the procedure displayed on the Techstream.

6. TIRE POSITION IDENTIFICATION (NOT USING TECHSTREAM) (Tire Inflation Pressure Display Function)

(a) Set the tire pressure to the specified value.

Click here

(b) Perform initialization to clear the existing tire position information, then drive the vehicle at 40 km/h (25 mph) or more for 10 to 30 minutes in 1 trip until each tire position is automatically identified.

HINT:

• Do not drive the vehicle in reverse gear while performing Tire Position Identification. If the vehicle is driven in reverse gear while performing Tire Position Identification, identification information will be discarded and Tire Position Identification may take longer than usual.
• Tire Position Identification may take longer than normal in the following situations.
  • The vehicle is stopped frequently
  • The vehicle is stopped for long period of time
  • The vehicle is driven in reverse
  • The vehicle is driven on rough roads or uneven surfaces
  • The vehicle is driven in close proximity to another vehicle with the same type of tire pressure warning valve and transmitter installed for a long period of time
  • The vehicle was not stopped for 15 minutes or more before registration
  • The vehicle is driven at 40 km/h (25 mph) or less for a long period of time

System Diagram

SYSTEM DIAGRAM

HINT:

Each tire pressure warning valve and transmitter sends its transmitter ID, temperature and tire pressure information to the tire pressure warning ECU and receiver.

Terminals Of Ecu

TERMINALS OF ECU

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

(a) Disconnect the K11 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.

(b) Connect the K11 tire pressure warning ECU and receiver connector.

(c) Measure the voltage according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.

HINT:

Measure the values on the wire harness side while the connector is connected.

(d) Using an oscilloscope, check waveform 1.

HINT:

The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.

Test Mode Procedure

TEST MODE PROCEDURE

TEST MODE (SIGNAL CHECK MODE) PROCEDURE

HINT:

• When entering test mode (signal check mode), the tire pressure warning ECU and receiver sets all the test mode (signal check mode) DTCs first.

  After the tire pressure warning ECU and receiver completes the signal check for each inspection item, the DTCs for systems that are determined to be normal will be cleared.

  The DTCs for other inspection items may not be cleared when only a certain signal is inspected.

• When test mode (signal check mode) returns to normal mode, all the test mode (signal check mode) DTCs will be cleared.
• Operation of the tire pressure warning reset switch can be checked in test mode (signal check mode).
• During test mode (signal check mode), the system will not be initialized by operating the steering pad switch assembly. The circuit of the tire pressure warning reset switch can be inspected during this mode.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Utility / Signal Check.

HINT:

Every time the test mode (signal check mode) DTC clear conditions are satisfied, the tire pressure warning light illuminates for 1 second. Following this, the tire pressure warning light blinks at 0.125 second intervals.

(f) Tire pressure warning reset switch check (DTC C2198).

(1) Select "Set Pressure" on the multi-information display and press the "OK" switch (steering pad switch assembly).

(g) Transmitter data reception check (DTCs C2181 to C2184).

(1) Wait for 1.5 minutes with the vehicle stopped, or drive the vehicle at a speed of 50 km/h (31 mph) or more for 1 minute.

HINT:

The tire pressure warning valve and transmitters send signals to the tire pressure warning ECU and receiver once every 1.5 minutes while the vehicle is stopped and once every minute while driving.

(h) Check that the tire pressure warning system test mode (signal check mode) DTCs are cleared.

(i) Result

HINT:

After the signal check is completed, check for test mode (signal check mode) DTCs to confirm the system status.

(j) End of test mode (signal check mode)

(1) After completing test mode (signal check mode), turn the engine switch off and disconnect the Techstream.

(k) Test mode (signal check mode) DTCs

(1) If a trouble code is displayed during the test mode (signal check mode) DTC check, check the diagnosis procedure listed for that code. For details of each code, refer to Link below.

Tire Position Not Identified

DESCRIPTION

The tire pressure warning ECU and receiver identifies the tire position for each tire pressure warning valve and transmitter according to the wheel speed signals from the skid control ECU and acceleration rate signal from each acceleration sensor built into each tire pressure warning valve and transmitter.

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning valve and transmitter, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if one of the valve and transmitters has been replaced.

  for Registration:

  Click here

  for Initialization

  Click here

PROCEDURE

(a) Set the tire pressure to the specified value.

Click here

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(g) Display the "ID Tire Inflation Pressure" value for each wheel using the Techstream.

HINT:

*1: It may take a few minutes until the values are displayed.

(h) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.

NOTICE:

• It may take a few minutes until the values are displayed.
• When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.

(i) Read the "ID Tire Inflation Pressure" value and identify the tire with reduced pressure, and record the corresponding tire pressure warning valve and transmitter (ID1 to ID4).

(j) Repeat for each tire.

(k) Set the tire pressure to the specified value.

Click here

NEXT

(a) Leave the vehicle with the engine switch turned off for 15 minutes or more.

HINT:

After the vehicle has been stopped for 15 minutes or more, the tire pressure warning valve and transmitter will transmit radio wave signals more frequently for the first several minutes of driving.

(b) Perform initialization to clear the existing tire position information.

Click here

NEXT

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Drive the vehicle at 40 km/h (25 mph) or more for 10 to 30 minutes in 1 trip.

HINT:

Do not drive the vehicle in reverse gear while performing Tire Position Identification. If the vehicle is driven in reverse gear while performing Tire Position Identification, identification information will be discarded and Tire Position Identification may take longer than usual.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Without turning off the engine switch, check the tire position for each transmitter.

B

GO TO TIRE PRESSURE WARNING LIGHT CIRCUIT INSPECTION PROCEDURE

C

END

A

(a) Without turning off the engine switch, check each transmitter with its tire position displayed as "Judging".

(b) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(c) Without turning off the engine switch, check the number of times the transmitter signal and speed sensor signal have synchronized.

Example: Transmitter ID1 installed to front wheel LH

OK:

The transmitter signal and speed sensor signal have synchronized one or more times.

NG

REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

OK

(a) Check that the following conditions are not met:

(1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

(2) Devices using similar radio frequencies are used in the vehicle.

OK:

Facilities or devices that use similar radio frequencies are not located in the vicinity of the vehicle.

HINT:

Radio wave transmissions may be interrupted due to the surroundings or devices installed by the user.

OK

IDENTIFY TIRE POSITION DURING DRIVING AGAIN

NG

CHECK IF ANY DEVICE IS INSTALLED BY USER

Tire Pressure Warning Light Circuit

DESCRIPTION

If the tire pressure warning ECU and receiver detects any problems, the tire pressure warning light blinks for 1 minute then illuminates, and tire pressure monitoring is disabled at the same time. At this time, the ECU stores a DTC in memory.

The tire pressure warning ECU and receiver sends the tire pressure warning light illumination request signal to the main body ECU (multiplex network body ECU) via a direct line. The main body ECU (multiplex network body ECU) then sends the signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

(a) Check if CAN communication system DTCs are output.

Click here

B

GO TO CAN COMMUNICATION SYSTEM

A

(a) Clear the DTCs.

(b) Turn the engine switch off.

(c) Turn the engine switch on (IG).

(d) Check for DTCs.

B

GO TO DTC (B1247)

A

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(f) Check the condition of the tire pressure warning light using the Techstream.

OK:

The tire pressure warning light turns on or off in accordance with the Techstream operation.

OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

GO TO METER / GAUGE SYSTEM

Lost Communication with Brake System Control Module (U0129)

DESCRIPTION

The tire pressure warning ECU and receiver receives signals from the skid control ECU (brake actuator assembly) via CAN communication system.

PROCEDURE

(a) Go to CAN communication system.

Click here

NEXT

END