METER / GAUGE SYSTEM Speedometer Malfunction

WIRING DIAGRAM

A01BGANE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT COMBINATION METER ASSEMBLY


    1. A01BDS8E07

      Check the input signal waveform using an oscilloscope.


      1. Remove the combination meter assembly with the connector still connected.

      2. Connect the oscilloscope to the terminal SI (H20-15) and body ground.

      3. Start the engine.

      4. Check the signal waveform according to the condition(s) in the table below.

        A01BB3CE01
        Item Condition
        Tool setting 5 V/DIV., 10 ms/DIV.
        Vehicle condition Driving at approx. 20 km/h (12 mph)
        OK
        The correct waveform appears as shown in the illustration.

        Tech Tips

        As vehicle speed increases, the cycle of the signal waveform narrows.


    NG

    INSPECT SPEEDOMETER SENSOR Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY

  2. INSPECT SPEEDOMETER SENSOR


    1. A01BAUME01

      Disconnect the connector from the speedometer sensor.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D38-1 (IG) - Body ground Turn the ignition switch OFF → ON Below 1 V → 10 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (BETWEEN COMBINATION METER AND SPEEDOMETER SENSOR)


    1. A01BEKCE01

      Disconnect H20 and D38 connectors.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      SI (H20-15) - SI (D38-3) Always Below 1 Ω
      E3 (H20-29) - E (D38-2) Always Below 1 Ω
      SI (H20-15) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SPEEDOMETER SENSOR


    1. A01BAUME01

      Check voltage.


      1. Connect the positive lead (+) from the battery to terminal 1 and negative (-) lead to terminal 2.

      2. Connect the positive (+) lead from the tester to terminal 3 and the negative (-) lead to terminal 2.

        Standard Voltage
        Tester Connection Condition Specified Condition
        IG (D38-1) - Body ground Ignition switch OFF → ON Below 1 V → 10 to 14 V

      3. Rotate the shaft.

      4. Check that there is voltage change from approximately 0 V to 11 V or more between terminals 2 and 3.

      Tech Tips

      The voltage should change 4 times for every revolution. If the result is not as specified, replace the sensor.


    NG

    REPLACE SPEEDOMETER SENSOR

    OK

    REPLACE COMBINATION METER ASSEMBLY