VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C120B

DTC Code DTC Name
C120B IG Supply Voltage Low

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
C120B The voltage at terminal IG1 is currently 8.4 V or less or there is a record of the voltage being 8.4 V or less, and there is a master cylinder pressure sensor output malfunction for 0.2 seconds or more.

  • Low power supply voltage

  • Brake actuator assembly

WIRING DIAGRAM

Refer to DTC C1241 Click here.

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG1 CIRCUIT)


    1. Disconnect the skid control ECU (brake actuator assembly) connector.

    2. A01FGCKE98
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A13-34 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FSE) B
      NG (for 4GR-FSE) C

    B

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    A

  2. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Check for DTC Click here.

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

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here