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

B003QNXE13
*1 Brake Actuator Assembly (Skid Control ECU)
*2 Combination Meter Assembly
*3 CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • When replacing the combination meter assembly, make sure to replace it with a new one.

  • If the vehicle speed is outside the allowable range when tested, perform the operation check.

    Click here

Tech Tips

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

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs.

      for LHD: Click here

      for RHD: Click here

      OK
      No DTCs are output.
      Result
      Result Proceed to
      OK (w/ VSC) A
      OK (w/o VSC) B
      NG C

    B

    CHECK FOR DTC (ANTI-LOCK BRAKE SYSTEM) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM for LHD: Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD: Click here

    A

  2. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)


    1. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    OK

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


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Speed Meter Operation Speedometer OFF, 0, 40, 80, 120 or 160 (km/h)

      There is a deviation in the values displayed on the speedometer display (Control range → Speedometer)


        for Australia (for TFT Display Type):

      • 40 → 40.9 to 45.4

      • 80 → 81.9 to 86.9

      • 120 → 122.8 to 127.8

      • 160 → 163.8 to 168.8


        for Australia (for Dot Display Type):

      • 40 → 40.5 to 45.0

      • 80 → 81.0 to 86.0

      • 120 → 121.4 to 126.4

      • 160 → 161.9 to 166.9


        except Australia:

      • 40 → 41.7 to 46.2

      • 80 → 83.4 to 88.4

      • 120 → 125.1 to 130.6

      • 160 → 166.2 to 173.2

      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 Click here

    OK

  4. READ VALUE USING GTS (VEHICLE SPEED METER)


    1. Using the GTS, read the Data List.

      Click here


      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

      Tech Tips


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

      • When the Data List values of the ECUs do not match, a signal output error of the brake actuator assembly (skid control ECU) or an internal malfunction of the combination meter assembly is suspected.

      OK
      Vehicle speed displayed on the GTS is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  5. READ VALUE USING GTS (VEHICLE SPEED)


    1. Using the GTS, read the Data List.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Vehicle Speed Vehicle speed Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Almost the same as actual vehicle speed -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      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).
      Result
      Result
      OK
      NG

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/ VSC: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/o VSC: Click here

    OK

  6. CHECK COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new one.

      Click here

    2. Check that the operation of the speedometer returns to normal.

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

    OK

    END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/ VSC: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) w/o VSC: Click here

  7. CHECK FOR DTC (ANTI-LOCK BRAKE SYSTEM)


    1. Check for DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 4 Click here

    NG

    GO TO ANTI-LOCK BRAKE SYSTEM Click here