DTC    C1235/35    Foreign Object is Attached on Tip of Front Speed Sensor RH

DTC    C1236/36    Foreign Object is Attached on Tip of Front Speed Sensor LH

DTC    C1238/38    Foreign Object is Attached on Tip of Rear Speed Sensor RH

DTC    C1239/39    Foreign Object is Attached on Tip of Rear Speed Sensor LH

DTC    C1275/75    Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC    C1276/76    Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

DTC    C1277/77    Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)

DTC    C1278/78    Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)

for Preparation Click here


DESCRIPTION

When foreign matter adheres to the speed sensor tip or speed sensor rotor, these DTCs are output. An abnormal waveform input from the sensor determines these conditions.
These DTCs may be detected when a malfunction occurs in the connector terminals or wire harness of the speed sensor circuit.
DTCs C1275/75 to C1278/78 will be cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs from C1275/75 to C1278/78 are output only in Test Mode.

DTC Code
INF Code
DTC Detection Condition
Trouble Area
C1235/35
541
Either of the following is detected:
  1. When driving at 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.
  2. When driving at 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.
  1. Speed sensor rotor malfunction (foreign object attached)
  2. Foreign object attached to speed sensor
  3. Open or short in speed sensor
  4. Open or short in wire harness
  5. Improperly connected connector, deformation or corrosion of terminals
  6. Resistance in speed sensor circuit
  7. Brake booster with master cylinder (Skid control ECU)
C1236/36
542
Either of the following is detected:
  1. When driving at 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.
  2. When driving at 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.
  1. Speed sensor rotor malfunction (foreign object attached)
  2. Foreign object attached to speed sensor
  3. Open or short in speed sensor
  4. Open or short in wire harness
  5. Improperly connected connector, deformation or corrosion of terminals
  6. Resistance in speed sensor circuit
  7. Brake booster with master cylinder (Skid control ECU)
C1238/38
543
Either of the following is detected:
  1. When driving at 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.
  2. When driving at 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.
  1. Speed sensor rotor malfunction (foreign object attached)
  2. Foreign object attached to speed sensor
  3. Open or short in speed sensor
  4. Open or short in wire harness
  5. Improperly connected connector, deformation or corrosion of terminals
  6. Resistance in speed sensor circuit
  7. Brake booster with master cylinder (Skid control ECU)
C1239/39
544
Either of the following is detected:
  1. When driving at 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.
  2. When driving at 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.
  1. Speed sensor rotor malfunction (foreign object attached)
  2. Foreign object attached to speed sensor
  3. Open or short in speed sensor
  4. Open or short in wire harness
  5. Improperly connected connector, deformation or corrosion of terminals
  6. Resistance in speed sensor circuit
  7. Brake booster with master cylinder (Skid control ECU)
C1275/75
C1276/76
C1277/77
C1278/78
-
Detected only during Test Mode.
  1. Speed sensor
  2. Speed sensor rotor

HINT:
  1. DTCs C1235/35 and C1275/75 are for the front speed sensor RH.
  2. DTCs C1236/36 and C1276/76 are for the front speed sensor LH.
  3. DTCs C1238/38 and C1277/77 are for the rear speed sensor RH.
  4. DTCs C1239/39 and C1278/78 are for the rear speed sensor LH.


WIRING DIAGRAM

Refer to DTCs C1464/31, C1465/32, C1466/33 and C1467/34 (Click here for front, and Click here for rear).

INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve (Click here).

1.CHECK DTC

  1. Check that no speed sensor malfunction DTC is output (Click here).

    HINT:
    When C1464/31, C1465/32, C1466/33, and/or C1467/34 are output together with C1235/35, C1236/36, C1238/38, and/or C1239/39, inspect and repair the trouble areas indicated by C1464/31, C1465/32, C1466/33, and/or C1467/34 first.


    Result:

    Result
    		Proceed to
    DTCs (C1235/35 and/or C1236/36) are output
    		A
    DTCs (C1238/38 and C1239/39) are output
    		B
    Speed sensor malfunction DTCs (C1464/31, C1465/32, C1466/33 and/or C1467/34) are output
    		C



B
Go to step 10

C
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)
A


2.CHECK FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR

  1. Remove the front speed sensor and front speed sensor rotor (Click here and Click here).

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

    OK:
    The sensor tip and rotor is free of scratches, oil, and foreign matter.

    NOTICE:
    1. 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.
    2. Check the speed sensor signal after cleaning or replacement (Click here).



NG
CLEAN OR REPLACE FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR
OK


3.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

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

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

  1. Disconnect the skid control ECU connector and the front speed sensor connector.

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

    Standard Resistance:
    for RH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-18 (FR+) - A34-2 (FR+)
    		Always
    		Below 1 Ω
    A61-18 (FR+) - Body ground
    		Always
    		10 kΩ or higher
    A61-5 (FR-) - A34-1 (FR-)
    		Always
    		Below 1 Ω
    A61-5 (FR-) - Body ground
    		Always
    		10 kΩ or higher
    for LH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-31 (FL+) - A13-2 (FL+)
    		Always
    		Below 1 Ω
    A61-31 (FL+) - Body ground
    		Always
    		10 kΩ or higher
    A61-32 (FL-) - A13-1 (FL-)
    		Always
    		Below 1 Ω
    A61-32 (FL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    C156480E51

  1. Reconnect the skid control ECU connector.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    for RH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A34-2 (FR+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V
    for LH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A13-2 (FL+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Front Speed Sensor)

    Result:

    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A


5.RECONFIRM DTC

  1. Turn the power switch off.

  1. Reconnect the front speed sensor connector.

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 seconds.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1235/35 and/or C1236/36) are output
    		A
    DTCs (C1235/35 and C1236/36) are not output
    		B



B
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


6.REPLACE FRONT SPEED SENSOR

  1. Turn the power switch off.

  1. Replace the front speed sensor (Click here).

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


NEXT


7.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 seconds.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1235/35 and/or C1236/36) are output
    		A
    DTCs (C1235/35 and C1236/36) are not output
    		B



B
END
A


8.REPLACE FRONT SPEED SENSOR ROTOR

  1. Turn the power switch off.

  1. Replace the front axle hub sub-assembly (front speed sensor rotor) (Click here).

    HINT:
    The front speed sensor rotor is incorporated into the front axle hub sub-assembly.
    If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.

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


NEXT


9.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 seconds.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1235/35 and/or C1236/36) are output (for LHD)
    		A
    DTCs (C1235/35 and/or C1236/36) are output (for RHD)
    		B
    DTCs (C1235/35 and C1236/36) are not output
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
END
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)  

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


    C151832E15

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

  1. Disconnect the rear speed sensor connector and the skid control sensor wire.

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

    Standard Resistance:
    for RH:
    Tester Connection
    		Condition
    		Specified Condition
    b2-2 - bQ1-1
    		Always
    		Below 1 Ω
    b2-2 - bQ1-2
    		Always
    		10 kΩ or higher
    b2-2 - Body ground
    		Always
    		10 kΩ or higher
    b2-1 - bQ1-2
    		Always
    		Below 1 Ω
    b2-1 - bQ1-1
    		Always
    		10 kΩ or higher
    b2-1 - Body ground
    		Always
    		10 kΩ or higher
    for LH:
    Tester Connection
    		Condition
    		Specified Condition
    b1-2 - bP1-1
    		Always
    		Below 1 Ω
    b1-2 - bP1-2
    		Always
    		10 kΩ or higher
    b1-2 - Body ground
    		Always
    		10 kΩ or higher
    b1-1 - bP1-2
    		Always
    		Below 1 Ω
    b1-1 - bP1-1
    		Always
    		10 kΩ or higher
    b1-1 - Body ground
    		Always
    		10 kΩ or higher

    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)

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



NG
REPLACE SKID CONTROL SENSOR WIRE (Click here)
OK


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

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

  1. Disconnect the skid control ECU connector.

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

    Standard Resistance:
    for RH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-22 (RR+) - bQ1-1 (RR+)
    		Always
    		Below 1 Ω
    A61-22 (RR+) - Body ground
    		Always
    		10 kΩ or higher
    A61-9 (RR-) - bQ1-2 (RR-)
    		Always
    		Below 1 Ω
    A61-9 (RR-) - Body ground
    		Always
    		10 kΩ or higher
    for LH:
    Tester Connection
    		Condition
    		Specified Condition
    A61-20 (RL+) - bP1-1 (RL+)
    		Always
    		Below 1 Ω
    A61-20 (RL+) - Body ground
    		Always
    		10 kΩ or higher
    A61-7 (RL-) - bP1-2 (RL-)
    		Always
    		Below 1 Ω
    A61-7 (RL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


12.INSPECT SKID CONTROL ECU (SENSOR OUTPUT)


    C213978E02

  1. Reconnect the skid control ECU connector.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    for RH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    bQ1-1 (RR+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V
    for LH:
    Tester Connection
    		Switch Condition
    		Specified Condition
    bP1-1 (RL+) - Body ground
    		Power switch on (IG)
    		5.7 to 14 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Skid Control Sensor Wire)

    Result:

    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A


13.RECONFIRM DTC

  1. Turn the power switch off.

  1. Reconnect the rear speed sensor connector and the skid control sensor wire.

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 seconds.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1238/38 and/or C1239/39) are output
    		A
    DTCs (C1238/38 and C1239/39) are not output
    		B



B
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


14.REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

  1. Turn the power switch off.

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

    HINT:
    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.

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


NEXT


15.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 15 seconds.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Result
    		Proceed to
    DTCs (C1238/38 and/or C1239/39) are output (for LHD)
    		A
    DTCs (C1238/38 and/or C1239/39) are output (for RHD)
    		B
    DTCs (C1238/38 and C1239/39) are not output
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
END
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)