METER / GAUGE SYSTEM Tachometer Malfunction

WIRING DIAGRAM

A013854E02

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ENGINE SPEED)


    1. Connect an intelligent tester to the DLC3.

    2. Start the engine and turn the intelligent tester ON.

    3. On the intelligent tester, select the following menu items: Powertrain / Engine and ECT / Data List / Engine SPD.

    4. Read the value displayed on the tester.

      OK
      The engine speed displayed on the tester is approximately equal to the actual engine speed.

    NG

    GO TO ENGINE CONTROL SYSTEM

    OK

  2. INSPECT TACHOMETER


    1. A0136E5E02

      Disconnect the C2 tachometer connector.

    2. Start the engine.

    3. Check the voltage with the engine idling.

      Standard Voltage
      Tester Connection Specified Condition
      C2-2 - Body ground Voltage generated intermittently
      OK
      As shown in the illustration.

    4. Reconnect the tachometer connector.


    NG

    REPLACE TACHOMETER

    OK

  3. CHECK FUSE (BUCK UP, DOME)


    1. A013867E02

      Remove the BACK UP fuse from the driver side J/B.

    2. Remove the DOME fuse from the engine room R/B.

    3. Measure the resistance.

      Standard Resistance
      Below 1 Ω

    4. Reinstall the fuses.


    NG

    INSPECT FOR SHORT CIRCUIT IN HARNESS AND ALL COMPONENTS CONNECTED TO FUSE

    OK

  4. CHECK HARNESS AND CONNECTOR (TACHOMETER-ECM)


    1. A0137ACE02

      Gasoline Engine:


      1. Disconnect the C2 tachometer connector.

      2. Disconnect the B25 ECM connector.

      3. Measure the resistance.

        Standard Resistance
        Tester Connection Specified Condition
        C2-2 - B25-14 Below 1 Ω
        C2-2 or B25-14 - Body ground 10 kΩ or higher

      4. Reconnect the ECM connector.

      5. Reconnect the tachometer connector.

    2. A013930E01

      Diesel Engine:


      1. Disconnect the C2 tachometer connector.

      2. Disconnect the B54 ECM connector.

      3. Measure the resistance.

        Standard Resistance
        Tester Connection Specified Condition
        C2-2 - B54-21 Below 1 Ω
        C2-2 or B54-21 - Body ground 10 kΩ or higher

      4. Reconnect the ECM connector.

      5. Reconnect the tachometer connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TACHOMETER