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Home >> Lexus >> 2007 >> GX 470 >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control >> Vehicle Stability Control System >> DTC C1337/37: Different Diameter Tire Malfunction >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION  ).
  1. CHECK TIRE SIZE 
    1. Check tire size and condition of all 4 wheels.

    NG: REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE 

    OK: Go to Next Step 

  2. INSPECT SPEED SENSOR ROTOR 
    1. Check the front speed sensor circuit (See DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT  ) and rear speed sensor circuit (See DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; 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  ).

    NG: REPLACE SPEED SENSOR ROTOR 

    OK: Go to Next Step 

  3. INSPECT SPEED SENSOR 
    1. Check the front speed sensor circuit (See DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT  ) and rear speed sensor circuit (See DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; 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  ).

    NG: REPLACE SPEED SENSOR 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SPEED SENSOR) 
    1. Check the front speed sensor circuit (See DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT  ) and rear speed sensor circuit (See DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; 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  ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SPEED SENSOR CIRCUIT) 

    OK: Go to Next Step 

  5. RECONFIRM DTC 
    1. Clear the DTCs (See DTC CHECK/CLEAR  ).
    2. Drive the vehicle at a speed of approximately 20 mph (32 km/h) or more for 60 seconds or more.
    3. Check if the same pending DTCs are detected (See DTC CHECK/CLEAR  ).

      HINT:

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

    Result 

    RESULT TABLE

    Condition Proceed to
    DTC is output A
    DTC is not output B

    B: END 

    A: REPLACE MASTER CYLINDER SOLENOID 

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