C2124

TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2121/21-C2124/24,C2181/81-C2184/84: No Signal from Transmitter ID1
C2184/84 - Transmitter ID4 not Received (Test Mode DTC)

DESCRIPTION

The tire pressure warning valve and transmitter installed in each tire and wheel assembly measures the tire pressures. The measured values are transmitted as radio waves to the tire pressure warning antenna and receiver on the body and then sent to the tire pressure warning ECU. The ECU compares the measured air pressure values with the air pressure threshold. When the measured air pressure value is less than this threshold, the warning light in the combination meter comes on.

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

Under the conditions below, the tire pressure warning antenna 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 tire pressure warning valve and transmitter ID is mistyped during registration.

* A wheel from a different vehicle is installed.

HINT
When a transmitter ID is not received from a tire pressure warning valve and transmitter for a total of 20 minutes while the vehicle speed is over 8 km/h (5 mph) or no transmitter ID is received from all of the tire pressure warning valve and transmitters for a total of 20 minutes, DTCs are set.

DTCs from C2121/21 to C2124/24 can only be cleared by using the Techstream. DTCs from C2181/81 to C2184/84 can be cleared when the transmitter in the tire pressure warning valve and transmitter sends a forced transmission signal or signal check mode (test mode) ends. DTCs from C2181/81 to C2184/84 are output only in signal check (test mode).

NOTICE:
When DTCs C2121/21 to C2124/24 are set, DTC C2173/73 may be set simultaneously. In such cases, troubleshoot C2173/73 first, then troubleshoot DTCs C2121/21 to C2124/24.

HINT
It is necessary to perform this procedure to identify the malfunctioning tire pressure warning valve and transmitter as it cannot be identified only by the output DTC.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
* It is necessary to perform initialization Initialization after registration Registration of the transmitter IDs into the tire pressure warning ECU if the ECU and/or any of the valve and transmitters have been replaced.

PROCEDURE

1. READ OUTPUT DTC (DTC C2173/73)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) Read DTCs.

Result:

NOTICE:
When DTC C2173/73 is output, troubleshoot that DTC first. Then troubleshoot DTCs C2121/21 to C2124/24.

B -- GO TO DTC C2173/73 C2173
A -- Continue to next step.

2. CHECK FREQUENCY RECEIVING CONDITION

(a) Check that the vehicle is not located in an area such as described below:

(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 described above, the tire pressure warning light may come on only in a particular area 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 -- Continue to next step.

3. IDENTIFY TRANSMITTER CORRESPONDING TO DTC

(a) Set all tire pressures to the specified value(s) Service Precautions.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

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

(g) Check the values by referring to the table below.

Tire Pressure Monitor

HINT
*: It may take about 2 or 3 minutes until the values are displayed.

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

(i) Check the Data List.

NOTICE:
* It takes about 2 or 3 minutes to display the updated tire pressure data.
* If the "ID Tire Inflation Pressure" data 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 it.
* Record the transmitter ID of which "ID Tire Inflation Pressure" data corresponds to each tire.

(j) After confirming that the "ID Tire Inflation Pressure" data for one tire (ID1 to ID4) has changed, repeat this procedure for each wheel. Identify which transmitter is not being received.

Result:

B -- END

A -- CHECK TRANSMITTER ID
C -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (ECU - RECEIVER)

(a) Disconnect the E44 ECU connector.

(b) Disconnect the L10 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 -- Continue to next step.

5. CHECK TRANSMITTER ID

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) Check the values by referring to the table below.

Tire Pressure Monitor

(g) Check the ID number on the identified transmitter by removing it from the tire and wheel.

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

Result:

B -- REGISTRATION OF TRANSMITTER ID
A -- Continue to next step.

6. REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

(a) Replace the tire pressure warning valve and transmitter Removal.

NEXT -- Continue to next step.

7. REGISTRATION OF TRANSMITTER ID

(a) Perform registration Registration.

NEXT -- Continue to next step.

8. PERFORM INITIALIZATION

(a) Perform initialization Initialization.

NEXT -- Continue to next step.

9. READ VALUE USING TECHSTREAM (DATA LIST)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) Check the values by referring to the table below.

Tire Pressure Monitor

HINT
* *: It may take about 2 or 3 minutes until the values are displayed.
* If no "ID Tire Inflation Pressure" data has 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 it.

Result:

A -- END
B -- Continue to next step.

10. REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER

(a) Replace the tire pressure warning antenna and receiver Removal.

NEXT -- Continue to next step.

11. READ VALUE USING TECHSTREAM (DATA LIST)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) Check the values by referring to the table below.

Tire Pressure Monitor

B -- REPLACE TIRE PRESSURE WARNING ECU Removal

A -- END