VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1273,C1274,C1332,C1333,C1466 and C1467

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)
C1332 Open in Rear Speed Sensor RH
C1333 Open in Rear Speed Sensor LH
C1466 Rear Speed Sensor RH
C1467 Rear Speed Sensor LH

DESCRIPTION

Each speed sensor detects the wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS.

The speed sensor rotors have rows of alternating N and S magnetic poles. The speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.

DTCs C1273 and C1274 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1273 and C1274 are output only in Test Mode.

Tip:

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

C362209E02
Table 1. Text in Illustration

*1

Front Speed Sensor

*2

Speed Sensor Rotor

*a

Waveform (Reference):

Between Speed Sensor (-) and Body Ground

*b

Low speed

*c

High speed

-

-

DTC No.

DTC Detection Condition

Trouble Area

C1273

Detected only during Test Mode.

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

  • Sensor installation

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

C1274

Detected only during Test Mode.

  • Rear speed sensor LH (rear axle hub and bearing assembly LH)

  • Sensor installation

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

C1332

An open or short in the speed sensor signal circuit.

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

  • Speed sensor circuit

  • Sensor installation

C1333

An open or short in the speed sensor signal circuit.

  • Rear speed sensor LH (rear axle hub and bearing assembly LH)

  • Speed sensor circuit

  • Sensor installation

C1466

Any of the following is detected:

  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a rear wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):

    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  6. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  7. An abnormal signal is received from a wheel speed sensor.

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

  • Speed sensor circuit

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

  • Sensor installation

  • Skid control ECU (brake actuator assembly)

C1467

Any of the following is detected:

  1. The vehicle speed is more than 50.4 km/h (31 mph) and pulses are not input for 0.4 seconds.

  2. After the initial start or restart and when the vehicle speed has reached 12 km/h (7 mph), a wheel speed of 0 km/h (0 mph) is detected.

  3. After the initial start or restart and when the vehicle speed has reached 20 km/h (12 mph), a rear wheel speed of 0 km/h (0 mph) is detected.

  4. The following conditions are met for 9 to 72 seconds or more (varies depending on the driving conditions):

    • The difference between the speed of the fastest wheel and the speed of the slowest wheel is 5% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

    • The vehicle speed is less than 100 km/h (62 mph) and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 5 km/h (3 mph) or more. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.)

    • The vehicle speed is 100 km/h (62 mph) or more and the difference between the speed of the fastest wheel and the speed of the slowest wheel is 6% or more of vehicle speed. (If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.)

  6. Wheel speed sensor signal fluctuation is equivalent to 98 G or more, or alternates between 50 G or more and -50 G or less.

  7. An abnormal signal is received from a wheel speed sensor.

  • Rear speed sensor LH (rear axle hub and bearing assembly LH)

  • Speed sensor circuit

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

  • Sensor installation

  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

C323176E02

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration (Click here).

PROCEDURE

  1. READ VALUE USING GTS (REAR SPEED SENSOR)

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Select the Data List on the GTS (Click here).

      Table 2. ABS/VSC/TRC

      Tester Display

      Measurement Item/Range

      Normal Condition

      Diagnostic Note

      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

    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.

    CHECK REAR SPEED SENSOR INSTALLATIONClick here

  2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)

    1. Turn the ignition switch off.

    2. Perform the sensor check using the Test Mode procedure (Click here).

      OK

      No Test Mode DTCs are output.

    CHECK REAR SPEED SENSOR INSTALLATIONClick here

  3. RECONFIRM DTC

    1. Turn the ignition switch off.

    2. Clear the DTCs (Click here).

    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).

    Result

    Result

    Proceed to

    DTCs C1332, C1333, C1466 and C1467 are not output.

    A

    DTCs C1332, C1333, C1466 and/or C1467 are output.

    B
    Tip:

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

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLYClick here

  4. CHECK REAR SPEED SENSOR INSTALLATION

    1. C210569E05

      Turn the ignition switch off.

    2. Check the speed sensor installation.

      OK

      There is no clearance between the sensor and the rear axle hub and bearing assembly.

      Table 3. Text in Illustration

      *a

      Normal

      *b

      Abnormal

      *c

      Clearance

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

    (Click here)

  5. INSPECT SKID CONTROL SENSOR WIRE

    1. U123596E02

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

    2. for RH:

      Disconnect the z13 and zO1 skid control sensor wire connectors.

    3. for LH:

      Disconnect the z15 and zN1 skid control sensor wire connectors.

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

      Standard Resistance

      Table 4. for RH

      Tester Connection

      Condition

      Specified Condition

      z13-2 (RR+) - zO1-1

      Always

      Below 1 Ω

      z13-2 (RR+) - zO1-2

      Always

      10 kΩ or higher

      z13-2 (RR+) or zO1-1 - Body ground

      Always

      10 kΩ or higher

      z13-1 (RR-) - zO1-2

      Always

      Below 1 Ω

      z13-1 (RR-) - zO1-1

      Always

      10 kΩ or higher

      z13-1 (RR-) or zO1-2 - Body ground

      Always

      10 kΩ or higher
      Table 5. for LH

      Tester Connection

      Condition

      Specified Condition

      z15-2 (RL+) - zN1-1

      Always

      Below 1 Ω

      z15-2 (RL+) - zN1-2

      Always

      10 kΩ or higher

      z15-2 (RL+) or zN1-1 - Body ground

      Always

      10 kΩ or higher

      z15-1 (RL-) - zN1-2

      Always

      Below 1 Ω

      z15-1 (RL-) - zN1-1

      Always

      10 kΩ or higher

      z15-1 (RL-) or zN1-2 - Body ground

      Always

      10 kΩ or higher
      Table 6. Text in Illustration

      *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)
      Note:

      Check the speed sensor signal after replacement (Click here).

    REPLACE SKID CONTROL SENSOR WIRE

    (Click here)

  6. 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 A78 (for CVT) or A79 (except CVT) skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance (for CVT)

      Table 7. for RH

      Tester Connection

      Condition

      Specified Condition

      A78-17 (RR+) - zO1-1

      Always

      Below 1 Ω

      A78-17 (RR+) or zO1-1 - Body ground

      Always

      10 kΩ or higher

      A78-29 (RR-) - zO1-2

      Always

      Below 1 Ω

      A78-29 (RR-) or zO1-2 - Body ground

      Always

      10 kΩ or higher
      Table 8. for LH

      Tester Connection

      Condition

      Specified Condition

      A78-31 (RL+) - zN1-1

      Always

      Below 1 Ω

      A78-31 (RL+) or zN1-1 - Body ground

      Always

      10 kΩ or higher

      A78-18 (RL-) - zN1-2

      Always

      Below 1 Ω

      A78-18 (RL-) or zN1-2 - Body ground

      Always

      10 kΩ or higher

      Standard Resistance (except CVT)

      Table 9. for RH

      Tester Connection

      Condition

      Specified Condition

      A79-19 (RR+) - zO1-1

      Always

      Below 1 Ω

      A79-19 (RR+) or zO1-1 - Body ground

      Always

      10 kΩ or higher

      A79-5 (RR-) - zO1-2

      Always

      Below 1 Ω

      A79-5 (RR-) or zO1-2 - Body ground

      Always

      10 kΩ or higher
      Table 10. for LH

      Tester Connection

      Condition

      Specified Condition

      A79-7 (RL+) - zN1-1

      Always

      Below 1 Ω

      A79-7 (RL+) or zN1-1 - Body ground

      Always

      10 kΩ or higher

      A79-20 (RL-) - zN1-2

      Always

      Below 1 Ω

      A79-20 (RL-) or zN1-2 - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. RECONFIRM DTC

    1. for RH:

      Reconnect the z13 and zO1 skid control sensor wire connectors.

    2. for LH:

      Reconnect the z15 and zN1 skid control sensor wire connectors.

    3. Reconnect the A78 (for CVT) or A79 (except CVT) skid control ECU (brake actuator assembly) connector.

    4. Clear the DTCs (Click here).

    5. Turn the ignition switch off.

    6. Start the engine.

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

    8. Check if the same DTC is output (Click here).

    Result

    Result

    Proceed to

    DTCs C1332, C1333, C1466 and/or C1467 are output.

    A

    DTCs C1332, C1333, C1466 and C1467 are not output.

    B

    USE SIMULATION METHOD TO CHECK

    (Click here)

  8. 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).

  9. RECONFIRM DTC

    1. Clear the DTCs (Click here).

    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).

      Result

      Result

      Proceed to

      DTCs C1332, C1333, C1466 and C1467 are not output.

      A

      DTCs C1332, C1333, C1466 and/or C1467 are output.

      B

    END

    REPLACE BRAKE ACTUATOR ASSEMBLY

    (Click here)