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Home › Toyota › 2006 › 4Runner Limited, 4.7 T, AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System SFI (2UZ-FE) Diagnostics - Component And System Inspection › ECM Power Source Circuit › Inspection Procedure

Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.

      Standard: 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      +B (E8-1) - E1 (E6-1) 9 to 14 V
      Fig 1: Identifying ECM Connectors/Terminals
      G04337110Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    NG: GO TO NEXT STEP. 

  2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the E6 ECM connector.
    2. Check the resistance between the wire harness side connector.

      Standard (Check for open): 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      E1 (E6-1) - Body ground Below 1
      Fig 2: Identifying E6 ECM Connector Terminals
      G04337111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP. 

  3. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.

      Standard: 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      IGSW (E8-9) - E1 (E6-1) 9 to 14 V
      Fig 3: Identifying ECM Connectors/Terminals
      G04337112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to step   6 

    NG: GO TO NEXT STEP. 

  4. CHECK FUSE (IGN FUSE) 
    1. Remove the IGN fuse from the driver side J/B.
    2. Check for continuity in the IGN fuse.

      Standard: Continuity 

    3. Reinstall the IGN fuse.
      Fig 4: Identifying IGN Fuse Location
      G04337113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED IGN FUSE 

    OK: GO TO NEXT STEP. 

  5. INSPECT IGNITION OR STARTER SWITCH ASSY 
    1. Disconnect the I18 ignition switch connector.
    2. Measure the resistance between the connector terminals shown in TESTER CONNECTIONS AND SPECIFIED CONDITIONS .

      Standard: 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Switch Position Tester Connection Specified Condition
      LOCK All Terminals 10 k or higher
      ACC 2-3 Below 1
      ON 2-3, 2-4, 6-7 Below 1
      START 1-2, 2-4, 6-7, 6-8 Below 1
      Fig 5: Identifying I18 Ignition Switch Connector Terminals
      G04337114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the ignition switch connector.

    NG: REPLACE IGNITION OR STARTER SWITCH ASSY 

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

  6. INSPECT ECM (MREL VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.

      Standard: 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      MREL (E8-8) - E1 (E6-1) 9 to 14 V
      Fig 6: Identifying ECM Connectors/Terminals
      G04337115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ECM (See  ECM (2UZ-FE)  ) 

    OK: GO TO NEXT STEP. 

  7. CHECK FUSE (EFI FUSE) 
    1. Remove the IGN fuse from the driver side J/B.
    2. Remove the EFI fuse from the engine room R/B.
    3. Check for continuity in the EFI fuse.

      Standard: Continuity 

    4. Reinstall the EFI fuse.
      Fig 7: Identifying EFI Fuse Location
      G04337116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED EFI FUSE, AND REPLACE FUSE 

    OK: GO TO NEXT STEP. 

  8. INSPECT EFI RELAY 
    1. Remove the EFI relay from the engine room R/B.
    2. Check for continuity in the EFI relay.

      Standard: 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      1 - 2 Continuity
      3 - 5 No continuity
      3 - 5 Continuity (Apply battery voltage to terminals 1 and 2)
      Fig 8: Identifying Relay Test Terminals
      G04036614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the EFI relay.

    NG: REPLACE EFI RELAY 

    OK: GO TO NEXT STEP. 

  9. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND) 
    1. Check the harness and connector between the EFI relay and ECM.
      1. Remove the EFI relay from the engine room R/B.
      2. Disconnect the E8 ECM connector.
      3. Check the resistance between the wire harness side connectors.

        Standard (Check for open): 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connection Specified Condition
        Engine room R/B (EFI relay terminal 1) - MREL (E8-8) Below 1
        Fig 9: Identifying EFI Relay Location
        G04337118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard (Check for short): 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connection Specified Condition
        Engine room R/B (EFI relay terminal 1) or MREL (E8-8) - Body ground 10 k or higher
      4. Reinstall the EFI relay.
      5. Reconnect the ECM connector.
    2. Check the harness and connector between the EFI relay and body ground.
      1. Remove the EFI relay from the engine room R/B.
      2. Check the resistance between the wire harness side connector and body ground.

        Standard (Check for open): 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connection Specified Condition
        Engine room R/B (EFI relay terminal 2) - Body ground Below 1
        Fig 10: Identifying ECM Connectors And Terminals
        G04337119Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Reinstall the EFI relay.

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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