METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

The meter CPU receives vehicle speed signals from the skid control ECU via the CAN communication system (CAN No. 1 Bus). The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage.

Tech Tips


  • Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Click here.

  • If the vehicle speed sensor circuit has a malfunction, the skid control ECU stored the DTCs. Troubleshoot the Brake Control System Click here.

WIRING DIAGRAM

A01NGREE19

INSPECTION PROCEDURE

Note

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

Tech Tips

Before starting the following inspection, check tire size and tire air pressure.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output 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. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SPEED METER OPERATION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

    5. Check the operation by referring to the table below.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Speed Meter Operation Speedometer 0, 40, 80, 120 mph*1 Confirm that the vehicle is stopped with the engine idling
      0, 40, 80, 120, 160, 200, 240 km/h*2

      • *1: for RHD except Australia and New Zealand

      • *2: except above

      OK
      Speedometer indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED METER)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Check the values by referring to the table below.

      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 (Speedometer tester) -
      OK
      Vehicle speed displayed on the intelligent tester is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

    NG

    READ VALUE USING INTELLIGENT TESTER (FR/FL/RR/RL WHEEL SPEED) Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    5. Check the values by referring to the table below.

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

    NG

    GO TO BRAKE CONTROL SYSTEM Click here

    OK

  5. REPLACE SKID CONTROL ECU


    1. Replace the skid control ECU with a new or a known good one Click here.

      OK
      The operation of the speedometer returns to normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    END