METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

The combination meter receives vehicle speed signals from the speedometer sensor via the direct line.

WIRING DIAGRAM

A01J3G2E07

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK SPEEDOMETER SENSOR (OUTPUT SIGNAL)

    A01J3RYE07
    Text in Illustration
    *a

    Component with harness connected

    (Combination Meter Assembly)

    1. Remove the combination meter assembly with the connector(s) still connected.

    2. Using an oscilloscope, check the signal waveform of the meter.

      Measurement Condition
      Item Content
      Tester Connection C27-5 (SI) - Body ground
      Tool Setting 5 V/DIV., 20 msec./DIV.
      Condition Driving at approx. 20 km/h (12 mph)
      OK
      The waveform displayed is as shown in the illustration.

      Tech Tips

      As the vehicle speed increases, the wavelength shortens.


    NG

    CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - COMBINATION METER ASSEMBLY AND BODY GROUND) Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  2. CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the S3 speedometer sensor connector.

    2. Disconnect the C27 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C27-5 (SI) - S3-3 (SI) Always Below 1 Ω
      C27-31 (MS5) - S3-1 (IG+) Always Below 1 Ω
      S3-1 (IG+) - S3-2 (SE) Always 10 kΩ or higher
      S3-1 (IG+) - S3-3 (SI) Always 10 kΩ or higher
      S3-2 (SE) - S3-3 (SI) Always 10 kΩ or higher
      S3-2 (SE) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SPEEDOMETER SENSOR