METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

The combination meter receives vehicle speed signals from the skid control ECU assembly via the CAN communication line. The wheel speed sensors output voltages that vary according to the vehicle speed. The skid control ECU assembly supplies power to the wheel speed sensors. The skid control ECU assembly calculates the vehicle speed based on the pulses of the voltage.

WIRING DIAGRAM

A01FQPME14

INSPECTION PROCEDURE

Note

If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output.


      1. for LHD Click here.

      2. for RHD Click here.

        Result
        Result Proceed to
        CAN communication DTC is not output A
        CAN communication DTC is output (for LHD) B
        CAN communication DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (SPEED METER OPERATION)


    1. Use the Active Test to check the operation of the speedometer Click here.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Speed Meter Operation Speedometer OFF, 0, 40, 80, 120, 160, 200, 240 or 280 (mph)*1 -
      OFF, 0, 40, 80, 120, 160, 200, 240 or 280 (km/h)*2

      • *1: for mph

      • *2: for km/h

      OK
      Speedometer indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING GTS (VEHICLE SPEED METER)


    1. Use the Data List to check if the speedometer is operating properly Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Vehicle Speed Meter Vehicle speed / Min.: 0 mph (0 km/ h), Max.: 255 km/h (158 mph) Almost same as actual vehicle speed -
      OK
      Vehicle speed displayed on the GTS is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING GTS (FR/FL/RR/RL WHEEL SPEED)


    1. Use the Data List to check the wheel speed Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Wheel Speed Vehicle speed / Min.: 0 mph (0 km/ h), Max.: 326 km/h (202 mph) Almost same as actual vehicle speed measured using speedometer tester -
      FL Wheel Speed Vehicle speed / Min.: 0 mph (0 km/ h), Max.: 326 km/h (202 mph) -
      RR Wheel Speed Vehicle speed / Min.: 0 mph (0 km/ h), Max.: 326 km/h (202 mph) -
      RL Wheel Speed Vehicle speed / Min.: 0 mph (0 km/ h), Max.: 326 km/h (202 mph) -
      OK
      Vehicle speed displayed on the GTS is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    OK

  5. CHECK COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new or normally functioning one Click here.

    2. Check the speedometer operation.

      OK
      The operation of the speedometer returns to normal.

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

    OK

    END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)