METER / GAUGE SYSTEM (for General Countries) Tachometer Malfunction

WIRING DIAGRAM

A01KHEYE01
A01KEWCE02
A01KFTNE02

INSPECTION PROCEDURE

PROCEDURE


  1. DESTINATION CHECK


    1. Check destination and spec according to the table below.

      A General w/ heater, General w/o heater (Except sigapore)
      B General w/o heater (Sigapore), Australia

    B

    INSPECT COMBINATION METER ASSEMBLY Click here

    A

  2. INSPECT COMBINATION METER ASSEMBLY

    INSPECTION USING OSCILLOSCOPE


    1. A01KEZ3E02
      A01KEFGE01

      Check the input signal waveform


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

      2. Connect the oscilloscope to the terminals C6-35 and body ground.

      3. Start the engine.

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

        Item Condition
        Tool setting 1 V/DIV, 10 ms/DIV
        Vehicle condition Engine idle speed
        OK
        As shown in the illustration

        Tech Tips

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

        Text in Illustration
        *a Wire Harness View:

    NG

    INSPECT REVOLUTION DETECTOR ASSEMBLY Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY

  3. INSPECT REVOLUTION DETECTOR ASSEMBLY


    1. A01KILHE01
      Text in Illustration
      *a Connector Front View:

      Remove the revolution detector assembly.

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

      Standard
      Tester connection Condition Specified condition
      1 - 2 Always Approx. 730 Ω

    NG

    REPLACE REVOLUTION DETECTOR ASSEMBLY

    OK

  4. CHECK HARNESS AND CONNECTOR (BETWEEN COMBINATION METER ASSEMBLY AND REVOLUTION DETECTOR ASSEMBLY)


    1. A01KIG5E01
      Text in Illustration
      *a Revolution Detector assembly Wier Harness View:
      *b Combination Meter assembly Wier Harness View:

      Disconnect the C2 and C6 connectors.

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

      Standard
      Tester connection Condition Specified condition
      C6-35 - C2-1 Always Below 1 Ω
      C6-10 - C2-2 Always Below 1 Ω
      C6-35 - Body ground Always 10kΩ or higher
      C6-10 - Body ground Always 10kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY

  5. INSPECT COMBINATION METER ASSEMBLY

    INSPECTION USING OSCILLOSCOPE


    1. A01KGDFE01
      A01KH7DE01

      Check the input signal waveform.


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

      2. Connect the oscilloscope to the terminals C6-35 and body ground.

      3. Start the engine.

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

        Item Condition
        Tool setting 1 V/DIV, 10 ms/DIV
        Vehicle condition Engine idle speed
        OK
        As shown in the illustration

        Tech Tips

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

        Text in Illustration
        *a Wire Harness View:

    NG

    CHECK HARNESS AND CONNECTOR (BETWEEN EMISSION CONTROL ECU AND COMBINATION METER ASSEMBLY) Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY

  6. CHECK HARNESS AND CONNECTOR (BETWEEN EMISSION CONTROL ECU AND COMBINATION METER ASSEMBLY)


    1. A01KH9LE01
      Text in Illustration
      *a Emission Control ECU Wier Harness View:
      *b Combination Meter Assembly Wier Harness View:

      Disconnect the C6 and E6 connectors.

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

      Standard
      Tester connection Condition Specified condition
      C6-35 - E6-6 Always Below 1 Ω
      C6-35 - Body ground Always 10kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE EMISSION CONTROL ECU