ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1265, C1285

DTC Code DTC Name
C1265 Vacuum Sensor
C1285 Vacuum Sensor Output Malfunction (Test Mode DTC)

DESCRIPTION

DTC C1285 can be deleted when the skid control vacuum sensor sends a vacuum signal or the Test Mode ends.

DTC C1285 is output only in the Test Mode.

DTC No. DTC Detection Condition Trouble Area
C1265

When any of following conditions detected:


  • Difference between PIM terminal voltage and PIM2 terminal voltage is 344 mV or more for 10 seconds or more continuously.

  • Noise occurs in the PIM or PIM2 terminal voltage 7 times or more within 5 seconds.

  • With PMC terminal voltage of 1 V or more, the stop light switch is turned OFF and within one second PIM terminal voltage or PIM2 terminal voltage does not change by 0.01 V or more, and this occurs 5 times or more.

  • PIM terminal voltage or PIM2 terminal voltage is outside of the range 0.5 V to 4.2 V for 1.2 seconds or more continuously.

  • When IG terminal voltage is normal, the VCP or VSP2 terminal voltage is not within the range of 4.4 V to 5.7 V, and this continues for 1.2 seconds or more continuously.

  • Vacuum hose

  • Skid control vacuum sensor RH/LH

  • Harness or connector

  • Brake actuator assembly
C1285 Detected only during Test Mode. Skid control vacuum sensor

WIRING DIAGRAM

A01CIHNE01

INSPECTION PROCEDURE

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
      Stop light switch function is normal.

    NG

    INSPECT STOP LIGHT CIRCUIT Click here

    OK

  2. READ VALUE ON INTELLIGENT TESTER (STOP LIGHT SW)


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to ON.

    6. Turn the intelligent tester on.

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

    8. According to the display on the intelligent tester, read the Data List.

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

      OFF: Brake pedal released

      ON: Brake pedal depressed

      		 -

    9. Check that the stop light switch display 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

    Click here

    OK

  3. CHECK VACUUM HOSE


    1. Turn the ignition switch off.

    2. Check the vacuum hose.

      OK
      No cracks or damage on the vacuum hoses.

    NG

    REPLACE VACUUM HOSE

    OK

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL VACUUM SENSOR)


    1. Disconnect the B9 skid control ECU (brake actuator assembly) connector.

    2. Disconnect the S32 and/or S33 skid control vacuum sensor connector.

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

      Standard Resistance
      RH
      Tester Connection Condition Specified Condition
      B9-2 (E4) - S32-1 (E4) Always Below 1 Ω
      B9-3 (PIM) - S32-2 (PIM) Always Below 1 Ω
      B9-30 (VCP) - S32-3 (VCP) Always Below 1 Ω
      B9-2 (E4) or S32-1 (E4) - Body ground Always 10 kΩ or higher
      B9-3 (PIM) or S32-2 (PIM) - Body ground Always 10 kΩ or higher
      B9-30 (VCP) or S32-3 (VCP) - Body ground Always 10 kΩ or higher
      LH
      Tester Connection Condition Specified Condition
      B9-20 (E3) - S33-1 (E3) Always Below 1 Ω
      B9-11 (PIM2) - S33-2 (PIM2) Always Below 1 Ω
      B9-10 (VCP2) - S33-3 (VCP2) Always Below 1 Ω
      B9-20 (E3) or S33-1 (E3) - Body ground Always 10 kΩ or higher
      B9-11 (PIM2) or S33-2 (PIM2) - Body ground Always 10 kΩ or higher
      B9-10 (VCP2) or S33-3 (VCP2) - Body ground Always 10 kΩ or higher

    4. Reconnect the B9 skid control ECU (brake actuator assembly) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)


    1. Turn the ignition switch to ON.

    2. A01CH2SE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control Vacuum Sensor)
      *b RH
      *c LH

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

      Standard Voltage
      RH
      Tester Connection Switch Condition Specified Condition
      S32-3 (VCP) - S32-1 (E4) Ignition switch ON 4.75 to 5.25 V
      LH
      Tester Connection Switch Condition Specified Condition
      S33-3 (VCP2) - S33-1 (E3) Ignition switch ON 4.75 to 5.25 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  6. REPLACE SKID CONTROL VACUUM SENSOR


    1. Replace the skid control vacuum sensor Click here.


    NEXT

  7. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. At a speed of 10 km/h (6 mph) or more, drive the vehicle and perform braking test (decelerate the vehicle by depressing the brake pedal).

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

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

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  8. CHECK HARNESS AND CONNECTOR (STP1 TERMINAL)


    1. Turn the ignition switch off.

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

    3. A01CIB3E12
      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
      B9-23 (STP1) - Body ground

      Stop light switch on

      (Brake pedal depressed)

      		 20 to 28 V
      B9-23 (STP1) - Body ground

      Stop light switch off

      (Brake pedal released)

      		 Below 1.5 V

    4. Reconnect the skid control ECU (brake actuator assembly) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here