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

A01QSBQE16
*1 Brake Actuator Assembly (Skid Control ECU)
*2 Combination Meter Assembly
*3 CAN Communication Line

CAUTION / NOTICE / HINT

Note


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

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

Tech Tips

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      CAN communication system DTC is not output
      CAN communication system DTC is output (for LHD)
      CAN communication system DTC is output (for RHD)

    CAN communication system DTC is output (for LHD)

    GO TO CAN COMMUNICATION SYSTEM Click here

    CAN communication system DTC is output (for RHD)

    GO TO CAN COMMUNICATION SYSTEM Click here

    CAN communication system DTC is not output

  2. CHECK ANTI-LOCK BRAKE SYSTEM OR VEHICLE STABILITY CONTROL SYSTEM


    • *1: w/o VSC

    • *2: w/ VSC


    1. Check if an anti-lock brake system*1 or vehicle stability control system*2 DTC is output.

      Anti-lock brake system: Click here

      Vehicle stability control system: Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Proceed to
      DTC is not output
      Anti-lock brake system DTC is output (w/o VSC)
      Vehicle stability control system DTC is output (w/ VSC)

    Anti-lock brake system DTC is output (w/o VSC)

    GO TO ANTI-LOCK BRAKE SYSTEM Click here

    Vehicle stability control system DTC is output (w/ VSC)

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    DTC is not output

  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, 160 or 200 (km/h or mph)

      Acceptable range (km/h or mph): [Control range → Speedometer display]


        for km/h

      • 40 → 41.7 to 46.2

      • 80 → 83.4 to 88.4

      • 120 → 125.1 to 130.6

      • 160 → 166.2 to 173.2

      • 200 → 207.7 to 215.7


        for mph

      • 40 → 40 to 43.5

      • 80 → 80 to 84.5

      • 120 → 100 to 125.5

      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, VEHICLE SPEED)


    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 mph (0 km/h), Max.: 255 km/h (158 mph) Almost same as actual vehicle speed measured using a speedometer tester -

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

      Body Electrical > Combination Meter > Data List
      Tester Display
      Vehicle Speed Meter

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

      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.

      Result
      Proceed to
      The Data List values of the ECUs match
      The Data List values of the ECUs do not match

    The Data List values of the ECUs match

    REPLACE COMBINATION METER ASSEMBLY Click here

    The Data List values of the ECUs do not match

  5. CHECK COMBINATION METER ASSEMBLY


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

      Click here

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

      OK
      The operation of the speedometer returns to normal.
      Result
      Proceed to
      OK
      NG (w/o VSC)
      NG (w/ VSC)

    OK

    END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)

    NG (w/o VSC)

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    NG (w/ VSC)

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here