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Home >> Toyota >> 2007 >> Highlander Base, 2.4 D, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (2AZ-FE) (Except Hybrid) >> SFI System >> ECM Power Source Circuit >> Inspection Procedure
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Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage according to the value(s) in the table below.
      Fig 1: Locating ECM Connectors
      G05245455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 IN PROBLEM SYMPTOMS TABLE 

    NG: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the E9 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 2: Disconnecting E9 ECM Connector
      G05245456Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 

    OK: Go to Next Step 

  3. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage according to the value(s) in the table below.
      Fig 3: Locating E5 And E9 ECM Connectors
      G05245457Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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

    NG: Go to Next Step 

  4. INSPECT IGN FUSE 
    1. Remove the IGN fuse from the instrument panel J/B assembly.
    2. Measure the resistance of the IGN fuse.
      Fig 4: Identifying IGN Fuse
      G05245458Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE IGN FUSE 

    OK: Go to Next Step 

  5. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY 
    1. Measure the resistance between the ignition switch terminals.
      Fig 5: Identifying Ignition Switch Connector Terminals
      G05245459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      Tester Condition 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 

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

  6. INSPECT ECM (MREL VOLTAGE) 
    1. Turn the ignition switch to the ON position.
    2. Measure the voltage according to the value(s) in the table below.
      Fig 6: Identifying E5 And E9 Connector Terminals
      G05245460Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

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

    NG: REPLACE ECM 

    OK: Go to Next Step 

  7. INSPECT 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.
      Fig 7: Identifying EFI No. 1 Fuse In Engine Room J/B
      G05245461Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance: 

    Below 1 Ω 

    NG: REPLACE EFI NO. 1 FUSE 

    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.
      Fig 8: Inspecting EFI Relay
      G05237222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      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 

    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.
        Fig 9: Identifying EFI Relay In Engine Room J/B
        G05245463Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the E5 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

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

        Standard resistance 

        TESTER CONNECTION AND SPECIFIED CONDITION

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

    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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