METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

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

WIRING DIAGRAM

A004OS4E02
*1 Brake Actuator Assembly (Skid Control ECU)
*2 Combination Meter Assembly
*3 CAN Communication Line

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      CAN communication DTC is not output A
      CAN communication DTC is output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      No DTCs are output A
      DTCs are output B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

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


    1. Using the GTS, perform the Active Test Click here.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Speed Meter Operation Speedometer OFF, 0, 40, 80, 120, 160, 200 or 240

      There is a deviation in the values displayed on the speedometer display

      (Control range → Speedometer)


        with km/h units:

      • 40 → 42.2 to 46.7

      • 80 → 84.6 to 89.6

      • 120 → 126.9 to 132.4

      • 160 → 166.2 to 175.6

      • 200 → 210.8 to 218.8


        with mph units:

      • 40 → 42.6 to 45.1

      • 80 → 84.3 to 88.3

      • 120 → 126.5 to 131.4

      Tech Tips


      • Make sure that the vehicle is stopped and the engine is idling. The doors will be locked automatically when performing the speedometer Active Test. This is a normal function.

      • The displayed value has the same units (km/h, mph) as the main scale of the vehicle speedometer.

      • The needle position should be within the acceptable range.

        OK
        Needle indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING GTS (VEHICLE SPEED METER)


    1. Using the GTS, read the Data List Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Vehicle Speed Meter Vehicle speed / Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph) Almost the 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).

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  5. READ VALUE USING GTS (WHEEL SPEED)


    1. Using the GTS, read the Data List Click here.

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

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here