ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1265/65, C1285/85

DTC Code DTC Name
C1265/65 Vacuum Sensor Malfunction
C1285/85 Vacuum Sensor Output Malfunction (Test Mode DTC)

DESCRIPTION

DTC C1285/85 can be deleted when the vacuum sensor sends a vacuum signal or the Test Mode ends.

DTC C1285/85 is output only in the Test Mode.

DTC Code DTC Detection Condition Trouble Area
C1265/65

When any of the following is detected:


  1. When IG1 terminal voltage is 20 to 32 V, VCM terminal voltage is not between 4.3 and 5.8 V for 1.2 seconds or more.

  2. Either PIM or PIM2 terminal voltage is not between 0.4 and 4.5 V for 1.2 seconds or more.

  3. After the stop light switch is turned off with PMC terminal voltage 1 V or more, either PIM or PIM2 terminal voltage does not change by 0.01 V in 1 second.

  4. Noise occurs in either PIM or PIM2 terminal voltage at least 7 times for 5 seconds.

  5. Difference between PIM and PIM2 terminal voltages is 344 mV or more for 10 seconds or more.

  • Vacuum sensor

  • Vacuum sensor circuit

  • Skid control ECU
C1285/85 Detected only during Test Mode. Vacuum sensor

WIRING DIAGRAM

A01CJ73E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK STOP LIGHT OPERATION


    1. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

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

    NG

    INSPECT STOP LIGHT CIRCUIT

    OK

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


    1. 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.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Select the Data List mode on the intelligent tester Click here.

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

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -

    5. Check that the stop light condition observed on the intelligent tester changes when the brake pedal is depressed.

      OK
      When the brake pedal is depressed, the intelligent tester displays "ON".

    NG

    INSPECT SKID CONTROL ECU (STP TERMINAL) 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. INSPECT VACUUM SENSOR


    1. A01CGW3E02

      Remove the No. 1 and No. 2 vacuum sensors.

    2. Connect 3 dry batteries of 1.5 V in series.

    3. Connect the VC terminal to the battery's positive (+) terminal and the E2 terminal to the battery's negative (-) terminal. Then apply about 4.5 V between the VC and E2 terminals.

      Note

      Do not apply 6 V or more to terminals VC and E2.

    4. Connect a voltmeter to terminals PIM and E2 of the sensor, and measure the output voltage at atmospheric pressure.

    5. Apply a vacuum to the vacuum sensor in 20 kPa (0.2 kgf/cm2, 2.9 psi) in increments to 100 kPa (1.02 kgf/cm2, 14.51 psi).

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

      Standard voltage
      Tester Connection

      Front Brake Pressure kPa (kgf/cm2, psi)

      		 Specified Condition
      2 (PIM) - 1 (E2) 20 (0.2, 2.9) 0.5 V
      2 (PIM) - 1 (E2) 60 (0.61, 8.7) 2.4 V
      2 (PIM) - 1 (E2) 100 (1.02, 14.51) 3.6 V

    7. Check the difference of voltage between the vacuum sensors.

      OK
      Difference is 340 mV or more.

      Note

      Check the vacuum sensor signal after replacement Click here


    NG

    REPLACE VACUUM SENSOR

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VACUUM SENSOR)


    1. A01CHENE01

      Install the vacuum sensor.

    2. Disconnect the skid control ECU connector and the vacuum sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S12-11 (E4) - V1-1 (E2) Always Below 1 Ω
      S12-11 (E4) - Body ground Always 10 kΩ or higher
      S12-10 (PIM) - V1-2 (PI M) Always Below 1 Ω
      S12-10 (PIM) - Body ground Always 10 kΩ or higher
      S12-21 (VCP) - V1-3 (VC) Always Below 1 Ω
      S12-21 (VCP) - Body ground Always 10 kΩ or higher
      S12-13 (E5) - V2-1 (E2) Always Below 1 Ω
      S12-13 (E5) - Body ground Always 10 kΩ or higher
      S12-23 (PIM2) - V2-2 (PIM) Always Below 1 Ω
      S12-23 (PIM2) - Body ground Always 10 kΩ or higher
      S12-22 (VCP2) - V2-3 (VC) Always Below 1 Ω
      S12-22 (VCP2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT SKID CONTROL ECU (SENSOR INPUT)


    1. A01CI3VE03

      Reconnect the skid control ECU connector.

    2. Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S12-21 (VCP) - Body ground Ignition switch ON 4.75 to 5.25 V
      S12-22 (VCP2) - Body ground Ignition switch ON 4.75 to 5.25 V

    NG

    REPLACE SKID CONTROL ECU

    OK

  7. RECONFIRM DTC


    1. Reconnect the vacuum sensor.

    2. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    3. 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).

    4. Check if the same DTC is recorded (See Pub. No. RM1008E, page 05-195).

      Result
      Result Proceed to
      DTC (C1265/65) is not output A
      DTC (C1265/65) is output B

      Tech Tips

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


    B

    REPLACE SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  8. INSPECT SKID CONTROL ECU (STP TERMINAL)


    1. A01CIMFE02

      Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S13-1 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 16 to 32 V
      S13-1 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 3 V

      Tech Tips

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

    OK

    REPLACE SKID CONTROL ECU