ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/o Vacuum Brake Booster), Diagnostic DTC:C1235, C1236, C1238, C1239

DTC Code DTC Name
C1235 Foreign Object is Attached on Tip of Front Speed Sensor RH
C1236 Foreign Object is Attached on Tip of Front Speed Sensor LH
C1238 Foreign Object is Attached on Tip of Rear Speed Sensor RH
C1239 Foreign Object is Attached on Tip of Rear Speed Sensor LH

DESCRIPTION

When foreign matter adheres to a speed sensor tip or speed sensor rotor, these DTCs are stored. The presence of foreign matter can be judged when an abnormal waveform is received from a sensor.

These DTCs may also be detected when a malfunction occurs in the connector terminals or wire harness of the speed sensor circuit.

When C1464, C1465, C1466, and/or C1467 are output together with C1235, C1236, C1238, and/or C1239, inspect and repair the trouble areas indicated by C1464, C1465, C1466, and/or C1467 first.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1235 Foreign Object is Attached on Tip of Front Speed Sensor RH 302

Either of the following is detected:


  1. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.

  2. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.

  • Speed sensor rotor malfunction (foreign matter attached)

  • Foreign matter attached to speed sensor

  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Resistance in speed sensor circuit

  • Skid control ECU assembly

 -
C1236 Foreign Object is Attached on Tip of Front Speed Sensor LH 303

Either of the following is detected:


  1. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.

  2. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.

  • Speed sensor rotor malfunction (foreign matter attached)

  • Foreign matter attached to speed sensor

  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Resistance in speed sensor circuit

  • Skid control ECU assembly

 -
C1238 Foreign Object is Attached on Tip of Rear Speed Sensor RH 304

Either of the following is detected:


  1. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.

  2. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.

  • Speed sensor rotor malfunction (foreign matter attached)

  • Foreign matter attached to speed sensor

  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Resistance in speed sensor circuit

  • Skid control ECU assembly

 -
C1239 Foreign Object is Attached on Tip of Rear Speed Sensor LH 305

Either of the following is detected:


  1. At a vehicle speed of 20 km/h (12 mph) or more, noise occurs on the speed sensor signal waveform for 5 seconds or more.

  2. At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.

  • Speed sensor rotor malfunction (foreign matter attached)

  • Foreign matter attached to speed sensor

  • Open or short in speed sensor

  • Open or short in wire harness

  • Improperly connected connector, deformation or corrosion of terminals

  • Resistance in speed sensor circuit

  • Skid control ECU assembly

 -

Tech Tips


  • DTC C1235 is for the front speed sensor RH.

  • DTC C1236 is for the front speed sensor LH.

  • DTC C1238 is for the rear speed sensor RH.

  • DTC C1239 is for the rear speed sensor LH.

DTC Detection Conditions: C1235 INF Code: 302
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition The vehicle speed is 20 km/h (12 mph) or more ○ -
The vehicle speed is 10 km/h (6 mph) or more - ○
Malfunction Status Noise occurs in the speed sensor signal waveform ○ -
Noise is input 1 time per rotor revolution - ○
Detection Time 5 seconds or more 15 seconds or more
Number of Trips 1 trip 1 trip
DTC Detection Conditions: C1236 INF Code: 303
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition The vehicle speed is 20 km/h (12 mph) or more ○ -
The vehicle speed is 10 km/h (6 mph) or more - ○
Malfunction Status Noise occurs in the speed sensor signal waveform ○ -
Noise is input 1 time per rotor revolution - ○
Detection Time 5 seconds or more 15 seconds or more
Number of Trips 1 trip 1 trip
DTC Detection Conditions: C1238 INF Code: 304
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition The vehicle speed is 20 km/h (12 mph) or more ○ -
The vehicle speed is 10 km/h (6 mph) or more - ○
Malfunction Status Noise occurs in the speed sensor signal waveform ○ -
Noise is input 1 time per rotor revolution - ○
Detection Time 5 seconds or more 15 seconds or more
Number of Trips 1 trip 1 trip
DTC Detection Conditions: C1239 INF Code: 305
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition The vehicle speed is 20 km/h (12 mph) or more ○ -
The vehicle speed is 10 km/h (6 mph) or more - ○
Malfunction Status Noise occurs in the speed sensor signal waveform ○ -
Noise is input 1 time per rotor revolution - ○
Detection Time 5 seconds or more 15 seconds or more
Number of Trips 1 trip 1 trip

WIRING DIAGRAM

Refer to DTCs C1464, C1465, C1466 and C1467.

for Front: Click here

for Rear: Click here

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve.

Click here

PROCEDURE


  1. CHECK DTC


    1. Check the output DTCs .

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1235 or C1236 is output. A
      DTC C1238 or C1239 is output. B
      DTCs C1464 or C1465 are output simultaneously. C
      DTCs C1466 or C1467 are output simultaneously. D

    B

    INSPECT SKID CONTROL SENSOR WIRE Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    D

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. INSPECT FRONT SKID CONTROL SENSOR WIRE

    B006DBCC06
    *A for RH
    *B for LH
    *1 Front Skid Control Sensor Wire
    *a

    Front view of wire harness connector

    (to Vehicle Side Connector)
    *b

    Front view of wire harness connector

    (to Sensor Side Connector)

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

    2. Remove the front 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
      z21 -1 (FR+) - A25 -5 (FR+) Always Below 1 Ω
      z21 -1 (FR+) or A25 -5 (FR+) - Body ground and other terminals Always 10 MΩ or higher
      z21 -2 (FR-) - A25 -1 (FR-) Always Below 1 Ω
      z21 -2 (FR-) or A25 -1 (FR-) - Body ground and other terminals Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A16 -2 (FL+) - AA3 -3 Always Below 1 Ω
      A16 -2 (FL+) or AA3 -3 - Body ground and other terminals Always 10 MΩ or higher
      A16 -1 (FL-) - AA3 -1 Always Below 1 Ω
      A16 -1 (FL-) or AA3 -1 - Body ground and other terminals Always 10 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SKID CONTROL SENSOR WIRE Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - FRONT 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 A10 and A12 skid control ECU assembly connectors.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A10-22 (FR+) - A25-5 (FR+) Always Below 1 Ω
      A10-22 (FR+) or A25-5 (FR+) - Body ground Always 10 MΩ or higher
      A10-23 (FR-) - A25-1 (FR-) Always Below 1 Ω
      A10-23 (FR-) or A25-1 (FR-) - Body ground Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A12-31 (FL+) - AA3 -3 Always Below 1 Ω
      A12-31 (FL+) or AA3 -3 - Body ground Always 10 MΩ or higher
      A12-32 (FL-) - AA3 -1 Always Below 1 Ω
      A12-32 (FL-) or AA3 -1 - Body ground Always 10 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT AXLE HUB SUB-ASSEMBLY Click here The front speed sensor and speed sensor rotor are incorporated into the front axle hub sub-assembly.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT SKID CONTROL SENSOR WIRE


    1. B006GRGC14
      *A for RH
      *B for LH
      *1 Front view of skid control sensor wire
      *a

      Front view of wire harness connector

      (to Vehicle Side Connector)
      *b

      Front view of wire harness connector

      (to Sensor Side Connector)

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

    2. Remove 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
      z24 -2 (RR+) - L175 -3 (RR+) Always Below 1 Ω
      z24 -2 (RR+) - L175 -4 (RR-) Always 10 MΩ or higher
      z24 -2 (RR+) or L175 -3 (RR+) - Body ground Always 10 MΩ or higher
      z24 -1 (RR-) - L175 -4 (RR-) Always Below 1 Ω
      z24 -1 (RR-) - L175 -3 (RR+) Always 10 MΩ or higher
      z24 -1 (RR-) or L175 -4 (RR-) - Body ground Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      L178 -2 (RL+) - LL4 -3 Always Below 1 Ω
      L178 -2 (RL+) - LL4 -4 Always 10 MΩ or higher
      L178 -2 (RL+) or LL4 -3 - Body ground Always 10 MΩ or higher
      L178 -1 (RL-) - LL4 -4 Always Below 1 Ω
      L178 -1 (RL-) - LL4 -3 Always 10 MΩ or higher
      L178 -1 (RL-) or LL4 -4 - Body ground Always 10 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SKID CONTROL SENSOR WIRE Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU 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 A13 and A11 skid control ECU assembly connectors.

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition
      A13-22 (RR+) - L175-3 (RR+) Always Below 1 Ω
      A13-22 (RR+) or L175-3 (RR+) - Body ground Always 10 MΩ or higher
      A13-21 (RR-) - L175-4 (RR-) Always Below 1 Ω
      A13-21 (RR-) or L175-4 (RR-) - Body ground Always 10 MΩ or higher
      for LH
      Tester Connection Condition Specified Condition
      A11-34 (RL+) - LL4 -3 Always Below 1 Ω
      A11-34 (RL+) or LL4 -3 - Body ground Always 10 MΩ or higher
      A11-35 (RL-) - LL4 -4 Always Below 1 Ω
      A11-35 (RL-) or LL4 -4 - Body ground Always 10 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK REAR SPEED SENSOR


    1. Check the speed sensor tip.

      OK
      The sensor tip is free of oil and foreign matter.
      Result
      Proceed to
      OK
      NG

    NG

    CLEAN REAR SPEED SENSOR

    OK

  7. CHECK REAR AXLE HUB AND BEARING ASSEMBLY


    1. Check the speed sensor rotor (rear axle hub and bearing assembly).

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

      Tech Tips

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

      Result
      Result Proceed to
      OK A
      Foreign matter and oil present B
      Damage present C

    A

    REPLACE REAR SPEED SENSOR Click here

    B

    CLEAN SPEED SENSOR ROTOR

    C

    REPLACE REAR AXLE HUB AND BEARING ASSEMBLY Click here