VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1492, C1493

DTC Code DTC Name
C1492 Clutch Switch OFF Stuck
C1493 Clutch Switch ON Stuck

DESCRIPTION

The clutch switch signal is sent to the skid control ECU (brake actuator assembly) via the CAN communication system.

If any faults are present in the CAN communication cable with the ECM, DTC U0100 (Lost Communication with ECM / PCM "A") is stored.

DTC No. DTC Detection Condition Trouble Area
C1492 Clutch switch system circuit has a malfunction

  • CAN communication system

  • Clutch switch assembly

  • Skid control ECU

  • ECM

  • Wire harness or connector
C1493 Clutch switch system circuit has a malfunction

  • CAN communication system

  • Clutch switch assembly

  • Skid control ECU

  • ECM

  • Wire harness or connector

WIRING DIAGRAM

B008BD8E02
*a from IG2 Relay
*b Clutch Switch Assembly
*c Skid Control ECU (Brake Actuator Assembly)
*d CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform VSC sensor neutral memorization Click here.

  • Inspect the fuses for circuits related to this system before performing the following 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

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. READ VALUE USING GTS (CLUTCH SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Select the Data List using the GTS.

      Powertrain / Engine / Data List
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Clutch Switch Clutch switch status/ ON or OFF

      ON: Clutch pedal depressed

      OFF: Clutch pedal released

      		 -
      OK
      The GTS displays ON or OFF according to the brake pedal operation.

    NG

    INSPECT CLUTCH SWITCH ASSEMBLY Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTCs C1492 and/or C1493 are not output. A
      DTCs C1492 and/or C1493 are output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SKID CONTROL ECU Click here

  4. INSPECT CLUTCH SWITCH ASSEMBLY


    1. Inspect the clutch switch assembly.

      for LHD: Click here

      for RHD: Click here

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE CLUTCH SWITCH ASSEMBLY Click here

    C

    REPLACE CLUTCH SWITCH ASSEMBLY Click here

    A

  5. CHECK HARNESS AND CONNECTOR (CLUTCH SWITCH ASSEMBLY POWER SOURCE TERMINAL)


    1. Disconnect the clutch switch assembly connector.

    2. B008BE7E02

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A21-1 - Body ground Ignition Switch ON 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Clutch Switch Assembly)

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (ECM - CLUTCH SWITCH ASSEMBLY)


    1. Disconnect the clutch switch connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for open)
      Tester Connection Condition Specified Condition
      A33-15 (CLSW) - A21-2 Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      A33-15 (CLSW) or A21-2 - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR