VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1237/37, C1275/75, C1276/76, C1277/77, C1278/78

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK TIRES

   
   

   1. Check the size and condition of all 4 tires (Click here).

      Tip:

      DTC C1237/37 is stored when tire deformation or a difference in tire size is detected.

      OK
      The diameters of all 4 tires are the same.

      Table 1. Result

      Result		Proceed to
      OK	Front speed sensor	A
      	Rear speed sensor	B
      NG		C

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   CHECK FRONT SPEED SENSOR TIP

   
   

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

   2. Check the speed sensor tip.

      OK
      No scratches or foreign matter on the sensor tip.

      Note:

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

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK FRONT SPEED SENSOR ROTOR

   
   

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

      Tip:

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

   2. Check the speed sensor rotors.

      Table 2. Result

      Result	Proceed to
      Scratches, oil or foreign matter on the rotors	A
      No scratches, oil or foreign matter on the rotors	B

      Note:

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

   
   
   • AClick here
   • BClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE)

   
   
   1. 

      Remove the skid control sensor wire (Click here).

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

      Standard Resistance
      for RH
      Tester Connection Condition Specified Condition z13 ("A"-2) - z13 ("B"-1) Always Below 1 Ω z13 ("A"-2) - z13 ("B"-2) Always 10 kΩ or higher z13 ("A"-2) - Body ground Always 10 kΩ or higher z13 ("A"-1) - z13 ("B"-2) Always Below 1 Ω z13 ("A"-1) - z13 ("B"-1) Always 10 kΩ or higher z13 ("A"-1) - Body ground Always 10 kΩ or higher
      for LH
      Tester Connection Condition Specified Condition z15 ("A"-2) - z15 ("B"-1) Always Below 1 Ω z15 ("A"-2) - z15 ("B"-2) Always 10 kΩ or higher z15 ("A"-2) - Body ground Always 10 kΩ or higher z15 ("A"-1) - z15 ("B"-2) Always Below 1 Ω z15 ("A"-1) - z15 ("B"-1) Always 10 kΩ or higher z15 ("A"-1) - Body ground Always 10 kΩ or higher

      Note:

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

   
   
   • OKClick here
   • NGClick here
5. Click here

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

   
   

   1. Disconnect the skid control ECU connector.

   2. Disconnect the front speed sensor connector and/or the rear speed sensor connector.

   3. 

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

      Standard Resistance
      for Front RH
      Tester Connection Condition Specified Condition A52 or A54-9 (FR+) - A31-1 (FR+) Always Below 1 Ω A52 or A54-9 (FR+) - Body ground Always 10 kΩ or higher A52 or A54-10 (FR-) - A31-2 (FR-) Always Below 1 Ω A52 or A54-10 (FR-) - Body ground Always 10 kΩ or higher
      for Front LH
      Tester Connection Condition Specified Condition A52 or A54-26 (FL+) - A32-1 (FL+) Always Below 1 Ω A52 or A54-26 (FL+) - Body ground Always 10 kΩ or higher A52 or A54-5 (FL-) - A32-2 (FL-) Always Below 1 Ω A52 or A54-5 (FL-) - Body ground Always 10 kΩ or higher
      for Rear RH
      Tester Connection Condition Specified Condition A52 or A54-8 (RR+) - z13-2 (RR+) Always Below 1 Ω A52 or A54-8 (RR+) - Body ground Always 10 kΩ or higher A52 or A54-29 (RR-) - z13-1 (RR-) Always Below 1 Ω A52 or A54-29 (RR-) - Body ground Always 10 kΩ or higher
      for Rear LH
      Tester Connection Condition Specified Condition A52 or A54-6 (RL+) - z15-2 (RL+) Always Below 1 Ω A52 or A54-6 (RL+) - Body ground Always 10 kΩ or higher A52 or A54-27 (RL-) - z15-1 (RL-) Always Below 1 Ω A52 or A54-27 (RL-) - Body ground Always 10 kΩ or higher

      Table 3. Text in Illustration

      *1	Front view of wire harness connector (to Skid Control ECU)
      *2	Front view of wire harness connector (to Front Speed Sensor)
      *3	Front view of wire harness connector (to Rear Speed Sensor)
      *4	for AD Series Engine
      *5	for ZR Series Engine

   
   
   • OKClick here
   • NGClick here
6. Click here

   PERFORM TEST MODE (SIGNAL CHECK)

   
   

   1. Perform the speed sensor signal check in "Test Mode Procedure" (Click here).

      OK
      All Test Mode DTCs are cleared.

      Table 4. Result

      Result		Proceed to
      DTC(s) is not cleared.	Front speed sensor	A
      	Rear speed sensor	B
      DTCs are cleared.		C

   
   
   • AClick here
   • BClick here
   • CClick here
7. Click here

   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).

   
   
   • NEXTClick here
8. Click here

   RECONFIRM DTC

   
   

   1. Clear the DTCs (Click here).

   2. Start the engine.

   3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

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

      Table 5. Result

      Result	Proceed to
      DTC C1237/37 is output.	A
      DTC C1237/37 is not output.	B

   
   
   • AClick here
   • BClick here
9. Click here

   REPLACE FRONT SPEED SENSOR ROTOR

   
   

   1. Turn the ignition switch off.

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

      Tip:

      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.

      Note:

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

   
   
   • NEXTClick here
10. Click here

    RECONFIRM DTC

    
    

    1. Clear the DTCs (Click here).

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

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

       Table 6. Result

       Result	Proceed to
       DTC C1237/37 is output.	A
       DTC C1237/37 is not output.	B

    
    
    • AClick here
    • BClick here
11. Click here

    REPLACE REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR

    
    

    1. Turn the ignition switch off.

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

       Tip:

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

       Note:

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

    
    
    • NEXTClick here
12. Click here

    RECONFIRM DTC

    
    

    1. Clear the DTCs (Click here).

    2. Start the engine.

    3. Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.

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

       Table 7. Result

       Result	Proceed to
       DTC C1237/37 is output.	A
       DTC C1237/37 is not output.	B

    
    
    • AClick here
    • BClick here
13. Click here

    CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR

14. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here

15. Click here

    REPLACE TIRES SO THAT ALL FOUR TIRES ARE THE SAME SIZE

16. Click here

    CLEAN OR REPLACE FRONT SPEED SENSOR

17. Click here

    REPLACE SKID CONTROL SENSOR WIREClick here

18. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

19. Click here

    USE SIMULATION METHOD TO CHECKClick here

20. Click here

    END