ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1235, C1236, C1238, C1239

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.

WIRING DIAGRAM

Refer to DTCs C1464, C1465, C1466 and C1467.

for Front:Click here

for Rear:Click here

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK DTC

   
   

   1. Check the output DTCs .

      Click here

      
      
      1. Chassis > ABS/VSC/TRC > Trouble Codes
      2. 
         
      3. 
         

      Result
      Result Proceed to DTC C1235 or C1236 is output. (for 2WD) A DTC C1235 or C1236 is output. (for AWD) B DTC C1238 or C1239 is output. C DTCs C1464 or C1465 are output simultaneously. D DTCs C1466 or C1467 are output simultaneously. E

   
   
   • AClick here
   • BClick here
   • CClick here
   • D

     REPAIR CIRCUITS INDICATED BY OUTPUT DTCSClick here

   • E

     REPAIR CIRCUITS INDICATED BY OUTPUT DTCSClick here

2. *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)
   Click here

   INSPECT FRONT SKID CONTROL SENSOR WIRE

   
   

   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
      Table 5. 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
      Table 6. 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

   
   
   • OKClick here
   • NG

     REPLACE FRONT SKID CONTROL SENSOR WIREClick here

3. Click here

   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
      Table 7. 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
      Table 8. 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-ASSEMBLYClick here

     Tip:

     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. Click here

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

   
   

   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
      Table 9. for RH Tester Connection Condition Specified Condition A10-22 (FR+) - A73-5 (FR+) Always Below 1 Ω A10-22 (FR+) or A73-5 (FR+) - Body ground Always 10 MΩ or higher A10-23 (FR-) - A73-1 (FR-) Always Below 1 Ω A10-23 (FR-) or A73-1 (FR-) - Body ground Always 10 MΩ or higher
      Table 10. for LH Tester Connection Condition Specified Condition A12-31 (FL+) - A72-3 (FL+) Always Below 1 Ω A12-31 (FL+) or A72-3 (FL+) - Body ground Always 10 MΩ or higher A12-32 (FL-) - A72-1 (FL-) Always Below 1 Ω A12-32 (FL-) or A72-1 (FL-) - Body ground Always 10 MΩ or higher

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

5. Click here

   CHECK FRONT SPEED SENSOR

   
   

   1. Check the speed sensor tip.

      OK
      The sensor tip is free of oil and foreign matter.

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     CLEAN FRONT SPEED SENSOR

6. Click here

   CHECK FRONT AXLE HUB SUB-ASSEMBLY

   
   

   1. Check the speed sensor rotor (front axle hub sub-assembly).

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

      Tip:

      The speed sensor rotor is incorporated into the rear front axle hub sub-assembly.

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

   
   
   • A

     REPLACE FRONT SPEED SENSORClick here

   • B

     CLEAN SPEED SENSOR ROTOR

   • C

     REPLACE FRONT AXLE HUB SUB-ASSEMBLYClick here

7. Click here

   INSPECT SKID CONTROL SENSOR WIRE

   
   
   1. 

      *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
      Table 11. 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
      Table 12. 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

   
   
   • OKClick here
   • NG

     REPLACE SKID CONTROL SENSOR WIREClick here

8. Click here

   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 A9 and A11 skid control ECU assembly connectors.

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

      Standard Resistance
      Table 13. 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
      Table 14. 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

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

9. Click here

   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

   
   
   • OKClick here
   • NG

     CLEAN REAR SPEED SENSOR

10. Click here

    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.

       Tip:

       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 SENSORClick here

    • B

      CLEAN SPEED SENSOR ROTOR

    • C

      REPLACE REAR AXLE HUB AND BEARING ASSEMBLYClick here