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Home >> Toyota >> 2009 >> 4Runner Limited, 4.0 U, 4WD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (1GR-FE) >> SFI System >> Circuit Test >> ECM Power Source Circuit >> Inspection Procedure
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Inspection Procedure

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

      Standard voltage 

      VOLTAGE SPECIFICATION TABLE

      Tester Connections Specified Conditions
      +B (E8-1) - E1 (E6-1) 9 to 14 V
      Fig 1: Identifying E6 & E8 ECM Connector Terminals
      G05553810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    NG: Go to Next Step. 

  2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the E6 ECM connector.
    2. Measure the resistance between the terminal of the ECM connector and body ground.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFICATION TABLE

      Tester Connections Specified Conditions
      E1 (E6-1) - Body ground Below 1 Ω
    3. Reconnect the ECM connector.
      Fig 2: Identifying E6 ECM Connector
      G05553811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step. 

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

      Standard voltage 

      VOLTAGE SPECIFICATION TABLE

      Tester Connections Specified Conditions
      IGSW (E8-9) - E1 (E6-1) 9 to 14 V
      Fig 3: Identifying E6 & E8 ECM Connector Terminals
      G05553812Courtesy 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. Measure the IGN fuse resistance.

      Standard resistance: Below 1 Ω 

    3. Reinstall the IGN fuse.
      Fig 4: Identifying IGN Fuse
      G05553813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to Next Step. 

  5. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY 
    1. Disconnect the I18 ignition switch connector.
    2. Check the resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION TABLE

      Ignition Switch Positions Tester Conditions Specified Conditions
      LOCK All Terminals 10 kΩ or higher
      ACC 2-3 Below 1 Ω
      ON 2-3-4, 6-7 Below 1 Ω
      START 1-2-4, 6-7-8 Below 1 Ω
    3. Reconnect the ignition switch connector.
      Fig 5: Identifying I18 Ignition Switch Connector Terminals
      G05553814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE IGNITION OR STARTER SWITCH ASSEMBLY 

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

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

      Standard voltage 

      VOLTAGE SPECIFICATION TABLE

      Tester Connections Specified Conditions
      MREL (E8-8) - E1 (E6-1) 9 to 14 V
      Fig 6: Identifying E6 & E8 ECM Connector Terminals
      G05553815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ECM 

    OK: Go to Next Step. 

  7. CHECK FUSE (EFI FUSE) 
    1. Remove the EFI fuse from the engine room R/B.
    2. Measure the EFI fuse resistance.

      Standard resistance: Below 1 Ω 

    3. Reinstall the EFI fuse.
      Fig 7: Identifying EFI Fuse
      G05553816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to Next Step. 

  8. INSPECT EFI RELAY (EFI RELAY) 
    1. Remove the EFI relay from the engine room R/B.
    2. Check the EFI relay resistance.

      Standard resistance 

      RESISTANCE SPECIFICATION TABLE

      Tester Connections Specified Conditions
      3-5 10 kΩ or higher
      3-5 Below 1 Ω (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the EFI relay.
      Fig 8: Identifying EFI Relay Terminals
      G05553817Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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. Measure the resistance between the terminals of the ECM connector and EFI relay terminal.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION TABLE

        Tester Connections Specified Conditions
        EFI relay (1) - MREL (E8-8) Below 1 Ω

        Standard resistance (Check for short) 

        RESISTANCE SPECIFICATION TABLE

        Tester Connections Specified Conditions
        EFI relay (1) or MREL (E8-8) - Body ground 10 kΩ or higher
    2. Check the harness and connector between the EFI relay and body ground.
      1. Measure the resistance between the terminal of the EFI relay and body ground.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION TABLE

        Tester Connections Specified Conditions
        EFI relay (2) - Body ground Below 1 Ω
        Fig 9: Identifying ECM & EFI Relay Terminals
        G05553818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Reinstall the EFI relay.
      3. Reconnect the ECM connector.

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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