METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

The combination meter assembly (meter circuit plate) receives vehicle speed signals from the skid control ECU (brake booster with master cylinder assembly) via CAN communication. The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU (brake booster with master cylinder assembly). The skid control ECU (brake booster with master cylinder assembly) supplies power to the vehicle speed sensor. The skid control ECU (brake booster with master cylinder assembly) detects vehicle speed signals based on pulses of the voltage.

Tech Tips


  • Factors that affect the indicated vehicle speed include the tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using the GTS. 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 (brake booster with master cylinder assembly) stores DTCs. Troubleshoot the electronically controlled brake system.

    Click here

WIRING DIAGRAM

B004QQPE16
*1 Skid Control ECU (Brake Booster with Master Cylinder Assembly)
*2 CAN Communication Line
*3 Combination Meter Assembly (Meter Circuit Plate)

CAUTION / NOTICE / HINT

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 CAN communication DTCs are output.

      Click here

      Result
      Result Proceed to
      CAN communication DTCs are not output. A
      CAN communication DTCs are output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

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


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Speed Meter Operation Speedometer OFF, 0, 40, 80, 120, 160 -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Speed Meter Operation
      OK
      Speedometer indication is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE) Click here

    OK

  3. CHECK FOR DTC


    1. Check if electronically controlled brake system DTCs are output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      Electronically controlled brake system DTCs are not output. A
      Electronically controlled brake system DTCs are output. B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  4. READ VALUE USING GTS (VEHICLE SPEED, VEHICLE SPEED METER)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus:


      1. for ABS/VSC/TRC: Chassis / ABS/VSC/TRC / Data List.

      2. for Combination Meter: Body Electrical / Combination Meter / Data List.

    5. Read the Data List according to the display on the GTS.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Vehicle Speed Maximum wheel speed sensor Min.: 0 km/h (0 mph), Max.: 326.4 km/h (203 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Vehicle Speed

      Body Electrical > Combination Meter > Data List
      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 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Vehicle Speed Meter
      Result
      Result Proceed to
      The Data List values of the ECUs match. A
      The Data List values of the ECUs do not match. B

      Tech Tips


      • When the Data List values of the ECUs match, an internal malfunction of the combination meter assembly (meter circuit plate) is suspected.

      • When the Data List values of the ECUs do not match, a signal output malfunction of the skid control ECU (brake booster with master cylinder assembly) or an internal malfunction of the combination meter assembly (meter circuit plate) is suspected.


    A

    REPLACE COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE) Click here

    B

  5. REPLACE COMBINATION METER ASSEMBLY (METER CIRCUIT PLATE)


    1. Replace the combination meter assembly (meter circuit plate) with a new or known good one.

      Click here

      OK
      The operation of the speedometer returns to normal.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here
    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for RHD: Click here