VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1422

DTC Code DTC Name
C1422 Master Cylinder Pressure Sensor Zero Point High Malfunction

DESCRIPTION

Refer to DTCs C1421, C1423 and C1424 Click here.

DTC NO. DTC Detection Condition Trouble Area
C1422 When the stop light switch is OFF, the PMC terminal voltage is more than 0.86 V for 5 seconds or more.

  • Stop light switch

  • Stop light switch circuit

  • Master cylinder pressure sensor circuit

  • Brake actuator assembly (Master cylinder pressure sensor)

WIRING DIAGRAM

A005K5ZE03

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly (skid control ECU), perform zero point calibration Click here.

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

Tech Tips

When C1425 is output together with C1422, inspect and repair the trouble areas indicated by C1425 first Click here.

PROCEDURE


  1. CHECK STOP LIGHT OPERATION


    1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

      OK
      Condition Illumination Condition
      Brake pedal depressed ON
      Brake pedal released OFF

    NG

    INSPECT STOP LIGHT CIRCUIT Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch / ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -

    4. Check that the stop light condition observed on the intelligent tester changes according to brake pedal operation.

      OK
      The intelligent tester displays ON or OFF according to brake pedal operation.

    NG

    CHECK TERMINAL VOLTAGE (STP) Click here

    OK

  3. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION


    1. Turn the ignition switch off.

    2. Check the brake pedal height and stop light switch installation.

      Tech Tips


      OK
      The brake pedal height and stop light switch installation are normal.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH Click here

    C

    ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH Click here

    A

  4. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform braking test (decelerate the vehicle by depressing the brake pedal).

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1422) is not output A
      DTC (C1422) is output (for LHD) B
      DTC (C1422) is output (for RHD) C

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  5. CHECK TERMINAL VOLTAGE (STP)


    1. A005MICE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Brake actuator assembly (Skid control ECU))

      Turn the ignition switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

    3. Disconnect the A54 or A56 brake actuator assembly (skid control ECU) connector.

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

      Standard Voltage
      except LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A54-2 (STP) - Body ground

      Stop light switch ON

      (Brake pedal depressed)

      		 8 to 14 V
      A54-2 (STP) - Body ground

      Stop light switch OFF

      (Brake pedal released)

      		 Below 1.5 V
      for LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A56-2 (STP) - Body ground

      Stop light switch ON

      (Brake pedal depressed)

      		 8 to 14 V
      A56-2 (STP) - Body ground

      Stop light switch OFF

      (Brake pedal released)

      		 Below 1.5 V

    5. Reconnect the A54 or A56 brake actuator assembly (skid control ECU) connector.

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

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here