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Home >> Toyota >> 2006 >> Highlander Limited, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (3MZ-FE) (Except Hybrid) >> SFI System >> ECM Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE)
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.

      Standard voltage

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E5-1 (+B) - E9-1 (E1) 9 to 14 V

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

    Fig 1: Measuring Voltage Of ECM Connectors
    G04427354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: GO TO NEXT STEP

  2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
    1. Disconnect the E9 ECM connector.
    2. Measure the resistance of the wire harness side connectors.

      Standard resistance

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E9-1 (E1) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

    Fig 2: Identifying E9 ECM Connector
    G04427355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP

  3. INSPECT ECM (IGSW VOLTAGE)
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.

      Standard voltage

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E5-9 (IGSW) - E9-1 (E1) 9 to 14 V

    OK: Go to step  6

    Fig 3: Inspecting ECM (IGSW Voltage)
    G04427356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: GO TO NEXT STEP

  4. CHECK IGN FUSE
    1. Remove the IGN fuse from the instrument panel J/B.
    2. Measure the resistance of the IGN fuse.

      Standard resistance:

      Below 1 Ω

    3. Install the IGN fuse.

    NG: REPLACE IGN FUSE

    Fig 4: Removing IGN Fuse From Instrument Panel J/B
    G04427357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP

  5. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY
    1. Disconnect the I15 ignition switch connector
    2. Measure the resistance of the switch terminals shown in the chart below.

      Standard resistance

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      6 (IG2) - 7 (AM2) LOCK 10 kΩ or higher
      6 (IG2) - 7 (AM2) ON Below 1 Ω

    NG: REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

    Fig 5: Identifying I15 Ignition Switch Connector
    G04427358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK AND REPLACE HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)

  6. INSPECT ECM (MREL VOLTAGE)
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.

      Standard voltage

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E5-8 (MREL) - E9-1 (E1) 9 to 14 V

    NG: REPLACE ECM

    Fig 6: Inspecting ECM (MREL Voltage)
    G04427359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP

  7. CHECK EFI NO.1 FUSE
    1. Remove the EFI No. 1 fuse from the engine room J/B.
    2. Measure the resistance of the EFI No. 1 fuse.

      Standard resistance:

      Below 1 Ω

    3. Install the EFI NO. 1 fuse.

    NG: REPLACE EFI NO.1 FUSE

    Fig 7: Removing EFI No. 1 Fuse From Engine Room J/B
    G04427360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP

  8. INSPECT EFI RELAY
    1. Remove the EFI relay from the engine room J/B.
    2. Measure the resistance of the EFI relay.

      Standard resistance

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      1 - 2 Below 1 Ω
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage is applied to terminals 1 and 2)

    NG: REPLACE EFI RELAY

    Fig 8: Identifying Relay Test Terminals
    G04044792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP

  9. CHECK HARNESS AND CONNECTOR (EFI RELAY- ECM, EFI RELAY - BODY GROUND)
    1. Check the wire harness between the EFI relay and ECM.
      1. Remove the EFI relay from the engine room J/B.
      2. Disconnect the E5 ECM connector.
      3. Measure the resistance of the wire harness side connectors.

        Standard resistance

        TESTER CONNECTION AND SPECIFIED CONDITION

        Tester Connection Specified Condition
        J/B EFI relay terminal 1 - E5-8 (MREL) Below 1 Ω
        J/B EFI relay terminal 1 or E5-8 (MREL) - Body ground 10 kΩ or higher
    2. Check the wire harness between the EFI relay and body ground.
      1. Remove the EFI relay from the engine room R/B.
      2. Measure the resistance between the wire harness side connector.

        Standard resistance

        TESTER CONNECTION AND SPECIFIED CONDITION

        Tester Connection Specified Condition
        J/B EFI MAIN relay terminal 2 - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

    Fig 9: Checking Wire Harness Between EFI Relay And Body Ground
    G04427362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL)

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