VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1273, C1274, C1277, C1278

DTC Code DTC Name
C1273 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1274 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)
C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

DTCs C1273 to C1278 will be deleted when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs from C1273 to C1278 are output only in Test Mode.

DTC Code DTC Detection Condition Trouble Area

C1273

C1274

 Detected only during Test Mode.

  • Rear speed sensor RH/LH

  • Sensor installation

  • Speed sensor rotor

C1277

C1278

 Detected only during Test Mode. Speed sensor rotor

Tech Tips


  • DTCs C1273 and C1277 are for the rear speed sensor RH.

  • DTCs C1274 and C1278 are for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1403 and C1404 Click here.

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)


    1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to the DTC Click here.

      ABS / VSC / TRC:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Speed Open RR speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      RL Speed Open RL speed sensor open detection / ERROR or NORMAL

      ERROR: Momentary interruption

      NORMAL: Normal

      		 -
      Result
      Result Proceed to
      There are momentary interruptions A
      There are no momentary interruptions B
      There is a constant open circuit C

      Tech Tips

      Perform the above inspection before removing the sensor and connector.


    B

    READ VALUE ON INTELLIGENT TESTER (REAR SPEED SENSOR) Click here

    C

    CHECK REAR SPEED SENSOR INSTALLATION Click here

    A

  2. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)


    1. Turn the ignition switch off.

    2. Repair or replace the harness or connector.

    3. Check for any momentary interruption between the skid control ECU and the rear speed sensor Click here.

    4. Check that there are no momentary interruptions.


    NEXT

  3. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

    2. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are erased.

    NG

    READ VALUE ON INTELLIGENT TESTER (REAR SPEED SENSOR) Click here

    OK

    END

  4. READ VALUE ON INTELLIGENT TESTER (REAR SPEED SENSOR)


    1. Turn the ignition switch off.

    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 Item/Range Normal Condition Diagnostic Note
      RR Wheel Speed RR wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer
      RL Wheel Speed RL wheel speed sensor reading / min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) Actual wheel speed Similar speed as indicated on speedometer

    5. Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle.

      Tech Tips

      Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Click here.

      OK
      The speed value output from the speed sensor displayed on the intelligent tester is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
      ABS / VSC / TRC:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      RR Wheel Direction RR wheel direction / FORWARD or BACK

      FORWARD: Forward

      BACK: Back

      		 -
      RL Wheel Direction RL wheel direction / FORWARD or BACK

      FORWARD: Forward

      BACK: Back

      		 -

    6. Check that the sensor signal conforms to the wheel direction.

      OK
      The wheel direction is displayed.

    NG

    CHECK REAR SPEED SENSOR INSTALLATION Click here

    OK

  5. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

    2. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are erased.

    NG

    CHECK REAR SPEED SENSOR INSTALLATION Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  6. CHECK REAR SPEED SENSOR INSTALLATION


    1. A017C9VE01

      Turn the ignition switch off.

    2. Check the speed sensor installation (for 2WD).

      OK
      There is no clearance between the sensor and the rear axle carrier.

    3. Check the speed sensor installation (for 4WD).

      OK
      There is no clearance between the sensor and the rear axle carrier.
      The installation nut is tightened properly.
      Torque
      8.0 N*m (82 kgf*cm, 71 in.*lbf)
      Result
      Result Proceed to
      OK (for 4WD) A
      OK (for 2WD) B
      NG (for 2WD) C
      NG (for 4WD) D

    B

    INSPECT REAR SPEED SENSOR Click here

    C

    INSTALL REAR SPEED SENSOR CORRECTLY (for 2WD) Click here

    D

    INSTALL REAR SPEED SENSOR CORRECTLY (for 4WD) Click here

    A

  7. CHECK REAR SPEED SENSOR TIP


    1. Remove the rear speed sensor Click here.

    2. Check the speed sensor tip.

      OK
      No scratches, oil, or foreign matter on the sensor tip.

      Note

      Check the speed sensor signal after cleaning or replacement Click here.


    NG

    CLEAN OR REPLACE REAR SPEED SENSOR

    OK

  8. CHECK REAR SPEED SENSOR ROTOR


    1. Remove the rear speed sensor rotor Click here.

    2. Check the speed sensor rotor.

      OK
      No scratches, oil, or foreign matter on the rotors.

      Note

      Check the speed sensor signal after cleaning or replacement Click here.

      Tech Tips

      If the rear speed sensor rotor needs to be replaced, replace it together with the rear drive shaft assembly.


    NG

    CLEAN OR REPLACE REAR SPEED SENSOR ROTOR

    OK

  9. INSPECT REAR SPEED SENSOR


    1. A017D48E02

      Install the rear speed sensor and the rear speed sensor rotor.

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

    3. Disconnect the rear speed sensor connector.

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

      Standard resistance
      for 2WD RH
      Tester Connection Condition Specified Condition
      2 (RR+) - Body ground Always 10 kΩ or higher
      1 (RR-) - Body ground Always 10 kΩ or higher
      for 4WD RH
      Tester Connection Condition Specified Condition
      1 (RR+) - Body ground Always 10 kΩ or higher
      2 (RR-) - Body ground Always 10 kΩ or higher
      for 2WD LH
      Tester Connection Condition Specified Condition
      2 (RL+) - Body ground Always 10 kΩ or higher
      1 (RL-) - Body ground Always 10 kΩ or higher
      for 4WD LH
      Tester Connection Condition Specified Condition
      1 (RL+) - Body ground Always 10 kΩ or higher
      2 (RL-) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for 2WD) A
      OK (for 4WD) B
      NG (for 2WD) C
      NG (for 4WD) D

      Note

      Check the speed sensor signal after replacement Click here.


    B

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR) Click here

    C

    REPLACE REAR SPEED SENSOR (for 2WD) Click here

    D

    REPLACE REAR SPEED SENSOR (for 4WD) Click here

    A

  10. CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)


    1. A017G3GE02

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

    2. Disconnect the skid control sensor wire.

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

      Standard resistance
      for RH
      Tester Connection Condition Specified Condition
      z10 ("A"-2) - z10 ("B"-1) Always Below 1 Ω
      z10 ("A"-2) - z10 ("B"-2) Always 10 kΩ or higher
      z10 ("A"-2) - Body ground Always 10 kΩ or higher
      z10 ("A"-1) - z10 ("B"-2) Always Below 1 Ω
      z10 ("A"-1) - z10 ("B"-1) Always 10 kΩ or higher
      z10 ("A"-1) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      z9 ("A"-2) - z9 ("B"-1) Always Below 1 Ω
      z9 ("A"-2) - z9 ("B"-2) Always 10 kΩ or higher
      z9 ("A"-2) - Body ground Always 10 kΩ or higher
      z9 ("A"-1) - z9 ("B"-2) Always Below 1 Ω
      z9 ("A"-1) - z9 ("B"-1) Always 10 kΩ or higher
      z9 ("A"-1) - Body ground Always 10 kΩ or higher

      Note

      Check the speed sensor signal after replacement Click here.


    NG

    REPLACE SKID CONTROL SENSOR WIRE

    OK

  11. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)


    1. A017CRVE03

      Reconnect the skid control sensor wire (for 2WD).

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

    3. Disconnect the skid control ECU connector.

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

      Standard resistance
      for 2WD RH
      Tester Connection Condition Specified Condition
      A24-17 (RR+) - z10-2 (RR+) Always Below 1 Ω
      A24-17 (RR+) - Body ground Always 10 kΩ or higher
      A24-16 (RR-) - z10-1 (RR-) Always Below 1 Ω
      A24-16 (RR-) - Body ground Always 10 kΩ or higher
      for 4WD RH
      Tester Connection Condition Specified Condition
      A24-17 (RR+) - N22-1 (RR+) Always Below 1 Ω
      A24-17 (RR+) - Body ground Always 10 kΩ or higher
      A24-16 (RR-) - N22-2 (RR-) Always Below 1 Ω
      A24-16 (RR-) - Body ground Always 10 kΩ or higher
      for 2WD LH
      Tester Connection Condition Specified Condition
      A24-5 (RL+) - z9-2 (RL+) Always Below 1 Ω
      A24-5 (RL+) - Body ground Always 10 kΩ or higher
      A24-4 (RL-) - z9-1 (RL-) Always Below 1 Ω
      A24-4 (RL-) - Body ground Always 10 kΩ or higher
      for 4WD LH
      Tester Connection Condition Specified Condition
      A24-5 (RL+) - O40-1 (RL+) Always Below 1 Ω
      A24-5 (RL+) - Body ground Always 10 kΩ or higher
      A24-4 (RL-) - O40-2 (RL-) Always Below 1 Ω
      A24-4 (RL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. INSPECT SKID CONTROL ECU (SENSOR INPUT)


    1. A017G2EE03

      Reconnect the skid control ECU connector.

    2. Turn the ignition switch on (IG).

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

      Standard voltage
      for 2WD RH
      Tester Connection Switch Condition Specified Condition
      z10-2 (RR+) - Body ground Ignition switch on (IG) 8 to 14 V
      for 4WD RH
      Tester Connection Switch Condition Specified Condition
      N22-1 (RR+) - Body ground Ignition switch on (IG) 8 to 14 V
      for 2WD LH
      Tester Connection Switch Condition Specified Condition
      z9-2 (RL+) - Body ground Ignition switch on (IG) 8 to 14 V
      for 4WD LH
      Tester Connection Switch Condition Specified Condition
      O40-1 (RL+) - Body ground Ignition switch on (IG) 8 to 14 V

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  13. PERFORM TEST MODE (SIGNAL CHECK)


    1. Turn the ignition switch off.

    2. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are erased.
      Result
      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for 4WD) C

    B

    REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR Click here

    C

    REPLACE REAR SPEED SENSOR Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  14. REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR


    1. Turn the ignition switch off.

    2. Replace the rear speed sensor Click here.

    3. Replace the rear axle hub and bearing assembly (rear speed sensor rotor) Click here.

      Tech Tips

      The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.

      If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  15. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are erased.

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    END

  16. REPLACE REAR SPEED SENSOR


    1. Turn the ignition switch off.

    2. Replace the rear speed sensor Click here.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  17. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are erased.

    NG

    REPLACE REAR SPEED SENSOR ROTOR Click here

    OK

    END

  18. REPLACE REAR SPEED SENSOR ROTOR


    1. Turn the ignition switch off.

    2. Replace the rear drive shaft assembly (rear speed sensor rotor) Click here.

      Tech Tips

      If the rear speed sensor rotor needs to be replaced, replace it together with the rear drive shaft assembly.

      Note

      Check the speed sensor signal after replacement Click here.


    NEXT

  19. PERFORM TEST MODE (SIGNAL CHECK)


    1. Perform the sensor check in the Test Mode procedure Click here.

      OK
      All Test Mode DTCs are erased.

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    END