VEHICLE STABILITY CONTROL SYSTEM TRC OFF Indicator Light Remains ON

DESCRIPTION

• The skid control ECU is connected to the combination meter via the CAN and multiplex communication systems.

• Upon receiving a signal indicating an abnormality from the ECM, the skid control ECU disables TRC. When TRC is disabled, the TRC OFF indicator light comes on in the combination meter.

  Tech Tips

  Even if the skid control ECU receives a signal indicating an abnormality from the ECM, VSC remains available and the warning light remains off.

• When the VSC OFF switch is operated, the system switches between normal mode, TRC off mode and VSC off mode.

  If the VSC OFF switch is pressed in normal mode, the system enters TRC off mode and TRC is disabled.

  When TRC is disabled, the TRC OFF indicator light comes on in the combination meter.

  Tech Tips

  If the VSC system is malfunctioning, the VSC OFF switch is disabled.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if a CAN communication system DTC is output Click here.

      Result
      Result Proceed to DTC is not output A DTC is output B

   
   

   B

   INSPECT CAN COMMUNICATION SYSTEM Click here

   A

2. CHECK MULTIPLEX COMMUNICATION SYSTEM

   
   

   1. Check if a multiplex communication system DTC is output Click here.

      Result
      Result Proceed to DTC is not output A DTC is output B

   
   

   B

   INSPECT MULTIPLEX COMMUNICATION SYSTEM Click here

   A

3. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

   
   

   1. Check if the skid control ECU connector is securely connected.

      OK
      The connector is securely connected.

   
   

   NG

   CONNECT CONNECTOR TO ECU CORRECTLY

   OK

4. CHECK BATTERY

   
   

   1. Check the battery voltage.

      Standard Voltage
      11 to 14 V

   
   

   NG

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 2UR-GSE) Click here

   OK

5. READ VALUE USING INTELLIGENT TESTER (VSC OFF SWITCH)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      TRC/VSC Off Mode	VSC OFF switch / NORMAL, TRC OFF or VSC OFF	NORMAL: Normal TRC OFF: TRC off mode VSC OFF: VSC off mode	-

   4. Using the intelligent tester, check the switch condition on the intelligent tester changes according to VSC OFF switch operation.

      OK
      The intelligent tester display changes according to VSC OFF switch operation.

   
   

   NG

   INSPECT VSC OFF SWITCH Click here

   OK

6. INSPECT COMBINATION METER ASSEMBLY

   
   

   1. Turn the engine switch off.

   2. Perform the Active Test of the combination meter (meter CPU) using the intelligent tester Click here.

   3. Check the combination meter.

      OK
      The TRC OFF indicator light turns on or off in accordance with the intelligent tester operation.

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Click here.

   
   

   NG

   REPLACE COMBINATION METER ASSEMBLY Click here

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here

7. INSPECT VSC OFF SWITCH

   
   
   1. 

      Text in Illustration

      *1	Component without harness connected (VSC OFF Switch)

      Turn the engine switch off.

   2. Disconnect the VSC OFF switch connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition 3 (+) - 4 (E) Switch is pushed in Below 25 Ω 3 (+) - 4 (E) Switch is not pushed in 10 kΩ or higher

   
   

   NG

   REPLACE VSC OFF SWITCH Click here

   OK

8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH)

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Skid Control ECU)
      *2	Front view of wire harness connector (to VSC OFF Switch)

      Disconnect the skid control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A62-30 (CSW) - J135-3 (+) Always Below 1 Ω A62-30 (CSW) - Body ground Always 10 kΩ or higher J135-4 (E) - Body ground Always Below 1 Ω

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here