VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1237,C1275,C1276,C1277 and C1278

DTC Code DTC Name
C1237 Speed Sensor Rotor Faulty
C1275 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1276 Abnormal Change in Output Signal of Front 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

The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from each speed sensor.

These signals are used for recognizing that all four wheels are operating properly.

Therefore, signals from all wheels must be equal.

DTCs C1275 to C1278 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1275 to C1278 are output only in Test Mode.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1237

Speed Sensor Rotor Faulty

Any of the following is detected:

  1. Discrepancy among four wheel speed sensor output.

  2. Abnormal pulse signals from 3 or more sensors.

  3. Continuous ABS control is performed for 60 seconds or more.

  4. VSC control is performed for 5 seconds or more.

  • Tire and wheel size

  • Tire deformation

  • Speed sensor rotor

  • Speed sensor

  • Speed sensor circuit

  • Skid control ECU (brake actuator assembly)

C1275

Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)

Detected only during Test Mode.

Front speed sensor rotor RH (front drive outboard joint shaft assembly RH)

C1276

Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

Detected only during Test Mode.

Front speed sensor rotor LH (front drive outboard joint shaft assembly LH)

C1277

Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)

Detected only during Test Mode.

Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)

C1278

Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

Detected only during Test Mode.

Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
Tip:

  • DTC C1275 is for the front speed sensor RH.

  • DTC C1276 is for the front speed sensor LH.

  • DTC C1277 is for the rear speed sensor RH.

  • DTC C1278 is for the rear speed sensor LH.

WIRING DIAGRAM

Refer to DTCs C1330, C1331, C1332, C1333, C1464, C1465, C1466 and C1467.

for front:Click here

for rear:Click here

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning.

Click here

Tip:

When C1330, C1331, C1332, C1333, C1464, C1465, C1466 and/or C1467 is output together with C1237, inspect and repair the trouble areas indicated by C1330, C1331, C1332, C1333, C1464, C1465, C1466 and/or C1467 first.

for C1330, C1331, C1464 and C1465:Click here

for C1332, C1333, C1466 and C1467:Click here

PROCEDURE

  1. CHECK TIRES

    1. Check the size and condition of all four tires.

      Click here

      Tip:

      The DTC is output when tire deformation or a difference in tire size is detected.

      OK

      The diameter of all four tires and the tire pressure are the same.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE TIRES SO THAT ALL FOUR TIRES ARE THE SAME SIZE

    OK

  2. READ VALUE USING GTS (SPEED SENSOR)

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Data List using the GTS.

      Click here

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      FR Wheel Speed

      Front wheel speed sensor RH reading

      Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)

      Vehicle stopped: 0 km/h (0 mph)

      When driving at constant speed: No large fluctuations

      FL Wheel Speed

      Front wheel speed sensor LH reading

      Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)

      Vehicle stopped: 0 km/h (0 mph)

      When driving at constant speed: No large fluctuations

      RR Wheel Speed

      Rear wheel speed sensor RH reading

      Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)

      Vehicle stopped: 0 km/h (0 mph)

      When driving at constant speed: No large fluctuations

      RL Wheel Speed

      Rear wheel speed sensor LH reading

      Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph)

      Vehicle stopped: 0 km/h (0 mph)

      When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      FR Wheel Speed

      FL Wheel Speed

      RR Wheel Speed

      RL Wheel Speed

    4. Check the speed value output from the speed sensor displayed on the GTS.

      Tip:

      Factors that affect the indicated vehicle speed include tire size, tire pressure, 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 GTS is similar to the speed indicated on the speedometer.

    Result

    Result

    Proceed to

    OK

    A

    NG (for front)

    B

    NG (for rear)

    C
    B

    CHECK FRONT SPEED SENSOR AND SENSOR ROTORClick here

    C

    INSPECT SKID CONTROL SENSOR WIREClick here

    A

  3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

    1. Turn the ignition switch off.

    2. Perform the sensor check using Test Mode Procedure.

      Click here

      Chassis > ABS/VSC/TRC > Utility

      Tester Display

      Signal Check

      OK

      All Test Mode DTCs are cleared.

      Result

      Result

      Proceed to

      OK

      A

      NG (for front)

      B

      NG (for rear)

      C
    B

    CHECK FRONT SPEED SENSOR AND SENSOR ROTORClick here

    C

    INSPECT SKID CONTROL SENSOR WIREClick here

    A

  4. RECONFIRM DTC

    1. Turn the ignition switch off.

    2. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    6. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1237 is not output.

    A

    DTC C1237 is output (for front).

    B

    DTC C1237 is output (for rear).

    C
    A

    USE SIMULATION METHOD TO CHECK

    Click hereClick here

    B

    REPLACE FRONT SPEED SENSORClick here

    C

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLYClick here

  5. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR

    1. Remove the front speed sensor and the component with the sensor rotor.

      for speed sensor:Click here

      for sensor rotor (for 1AD-FTV):Click here

      for sensor rotor (for 1ND-TV):Click here

      for sensor rotor (for 1NR-FE):Click here

      for sensor rotor (for 1ZR-FAE):Click here

      for sensor rotor (for 1ZR-FE, 2ZR-FE):Click here

    2. Check the speed sensor tip and speed sensor rotor.

      OK

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

      Note:

      • If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

        If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.

      • Check the speed sensor signal after cleaning or replacement.

        Click here

    Result

    Proceed to

    OK

    NG
    NG

    CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - FRONT SPEED SENSOR)

    1. Install the front speed sensor and the component with the sensor rotor.

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

    3. Disconnect the A97 skid control ECU (brake actuator assembly) connector and A91 or A92 front speed sensor connector.

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

      Standard Resistance

      Table 1. for RH

      Tester Connection

      Condition

      Specified Condition

      A97-16 (FR+) - A91-1 (FR+)

      Always

      Below 1 Ω

      A97-16 (FR+) or A91-1 (FR+) - Body ground

      Always

      10 kΩ or higher

      A97-4 (FR-) - A91-2 (FR-)

      Always

      Below 1 Ω

      A97-4 (FR-) or A91-2 (FR-) - Body ground

      Always

      10 kΩ or higher
      Table 2. for LH

      Tester Connection

      Condition

      Specified Condition

      A97-19 (FL+) - A92-1 (FL+)

      Always

      Below 1 Ω

      A97-19 (FL+) or A92-1 (FL+) - Body ground

      Always

      10 kΩ or higher

      A97-8 (FL-) - A92-2 (FL-)

      Always

      Below 1 Ω

      A97-8 (FL-) or A92-2 (FL-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. RECONFIRM DTC

    1. Reconnect the A97 skid control ECU (brake actuator assembly) connector and A91 or A92 front speed sensor connector.

    2. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the ignition switch off.

    4. Start the engine.

    5. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    6. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1237 is output.

      A

      DTC C1237 is not output.

      B
    B

    USE SIMULATION METHOD TO CHECK

    Click hereClick here

    A

  8. REPLACE FRONT SPEED SENSOR

    1. Turn the ignition switch off.

    2. Replace the front speed sensor.

      Click here

      Note:

      Check the speed sensor signal after replacement.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  9. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1237 is output.

      A

      DTC C1237 is not output.

      B
    B

    END

    A

  10. REPLACE FRONT DRIVE OUTBOARD JOINT SHAFT ASSEMBLY

    1. Turn the ignition switch off.

    2. Replace the front speed sensor rotor (front drive outboard joint shaft assembly).

      for sensor rotor (for 1AD-FTV):Click here

      for sensor rotor (for 1ND-TV):Click here

      for sensor rotor (for 1NR-FE):Click here

      for sensor rotor (for 1ZR-FAE):Click here

      for sensor rotor (for 1ZR-FE, 2ZR-FE):Click here

      Tip:

      The front speed sensor rotor is incorporated into the front drive outboard joint shaft assembly.

      If the front speed sensor rotor needs to be replaced, replace the front drive outboard joint shaft assembly.

      Note:

      Check the speed sensor signal after replacement.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  11. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1237 is output.

      A

      DTC C1237 is not output.

      B
    A

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    B

    END

  12. INSPECT SKID CONTROL SENSOR WIRE

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

      C273725C05

      *A

      for RH

      *B

      for LH

      *a

      Front view of skid control sensor wire

      *b

      Front view of wire harness connector

      (to Sensor Side Connector)

      *c

      Front view of wire harness connector

      (to Vehicle Side Connector)

      -

      -

    2. Remove the skid control sensor wire.

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

      Standard Resistance

      Table 3. for RH

      Tester Connection

      Condition

      Specified Condition

      h1-2 (RR+) - hL1-1 (RR+)

      Always

      Below 1 Ω

      h1-2 (RR+) - hL1-2 (RR-)

      Always

      10 kΩ or higher

      h1-2 (RR+) or hL1-1 (RR+) - Body ground

      Always

      10 kΩ or higher

      h1-1 (RR-) - hL1-2 (RR-)

      Always

      Below 1 Ω

      h1-1 (RR-) - hL1-1 (RR+)

      Always

      10 kΩ or higher

      h1-1 (RR-) or hL1-2 (RR-) - Body ground

      Always

      10 kΩ or higher
      Table 4. for LH

      Tester Connection

      Condition

      Specified Condition

      j1-2 (RL+) - jL1-1 (RL+)

      Always

      Below 1 Ω

      j1-2 (RL+) - jL1-2 (RL-)

      Always

      10 kΩ or higher

      j1-2 (RL+) or jL1-1 (RL+) - Body ground

      Always

      10 kΩ or higher

      j1-1 (RL-) - jL1-2 (RL-)

      Always

      Below 1 Ω

      j1-1 (RL-) - jL1-1 (RL+)

      Always

      10 kΩ or higher

      j1-1 (RL-) or jL1-2 (RL-) - Body ground

      Always

      10 kΩ or higher
      Note:

      Check the speed sensor signal after replacement.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE SKID CONTROL SENSOR WIRE

    Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE)

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

    2. Disconnect the A97 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance

      Table 5. for RH

      Tester Connection

      Condition

      Specified Condition

      A97-17 (RR+) - hL1-1 (RR+)

      Always

      Below 1 Ω

      A97-17 (RR+) or hL1-1 (RR+) - Body ground

      Always

      10 kΩ or higher

      A97-29 (RR-) - hL1-2 (RR-)

      Always

      Below 1 Ω

      A97-29 (RR-) or hL1-2 (RR-) - Body ground

      Always

      10 kΩ or higher
      Table 6. for LH

      Tester Connection

      Condition

      Specified Condition

      A97-31 (RL+) - jL1-1 (RL+)

      Always

      Below 1 Ω

      A97-31 (RL+) or jL1-1 (RL+) - Body ground

      Always

      10 kΩ or higher

      A97-18 (RL-) - jL1-2 (RL-)

      Always

      Below 1 Ω

      A97-18 (RL-) or jL1-2 (RL-) - Body ground

      Always

      10 kΩ or higher

      Result

      Proceed to

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. RECONFIRM DTC

    1. Install the skid control sensor wire.

    2. Reconnect the A97 skid control ECU (brake actuator assembly) connector.

    3. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    4. Turn the ignition switch off.

    5. Start the engine.

    6. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    7. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Result

      Proceed to

      DTC C1237 is output.

      A

      DTC C1237 is not output.

      B
    B

    USE SIMULATION METHOD TO CHECK

    Click hereClick here

    A

  15. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

    1. Turn the ignition switch off.

    2. Replace the rear speed sensor rotor with rear speed sensor (rear axle hub and bearing assembly).

      Click here

      Tip:

      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 the rear axle hub and bearing assembly with rear speed sensor.

      Note:

      Check the speed sensor signal after replacement.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  16. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 54 km/h (34 mph) or more for at least 120 seconds.

    5. Check if the same DTC is output.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

    Result

    Result

    Proceed to

    DTC C1237 is output.

    A

    DTC C1237 is not output.

    B
    A

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    B

    END