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Home › Toyota › 2008 › Camry Solara SLE, 2D Convertible › Repair and Diagnosis › Engine Performance › Engine Control System (3MZ-FE) › SFI System › ECM Power Source Circuit › Inspection Procedure

Inspection Procedure

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

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      +B (E4-1) - E1 (E6-1) 9 to 14 V
      +B2 (E4-2) - E1 (E6-1) 9 to 14 V
      Fig 1: Identifying ECM Connector
      G05128689Courtesy 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 ECM connector.
      2. Fig 2: Identifying ECM Connector
      G05128690Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminal of the ECM connector and body ground.

      Standard resistance: 

      Check for open 

      TESTER CONNECTION SPECIFIED CONDITION CHART- CHECK FOR OPEN

      Tester Connection Specified Condition
      E1 (E6-1) - Body ground Below 1 Ω
    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 the ON position.
    2. Measure the voltage between the terminals of the ECM connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      IGSW (E4-9) - El (E6-1) 9 to 14 V
      Fig 3: Identifying ECM Connector
      G05128691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  6

    NG: Go to Next Step 

  4. CHECK FUSE (IGN FUSE) 
    1. Remove the IG2 fuse from the engine room J/B.
      2. Fig 4: Identifying IG2 Fuse From Engine Room J/B
      G05128692Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the IG2 fuse resistance.

      Standard resistance: 

      Below 1 Ω 

    3. Reinstall the IG2 fuse.

    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. Inspect the ignition or starter switch assembly (See INSPECTION ).

    NG: REPLACE IGNITION OR STARTER SWITCH ASSEMBLY  (See COMPONENTS )

    OK: Go to Next Step 

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

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      MREL (E4-8) - E1 (E6-1) 9 to 14 V
      Fig 5: Identifying ECM Connector
      G05128693Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ECM  (See REMOVAL  )

    OK: Go to Next Step 

  7. CHECK FUSE (EFI FUSE) 
    1. Remove the EFI fuse from the engine room J/B.
      2. Fig 6: Identifying EFI Fuse From Engine Room J/B
      G05128552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the EFI fuse resistance.

      Standard resistance: 

      Below 1 Ω 

    3. Reinstall the EFI fuse.

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

    OK: Go to Next Step 

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage applied to terminals 1 and 2)
      Fig 7: Identifying Air Fuel Ratio Sensor Relay
      G04942983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the EFI relay.

    NG: REPLACE EFI MAIN 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 J/B.
        2. Fig 8: Identifying EFI Relay And ECM Connector
        G05128696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the ECM connector.
      3. Measure the resistance between the terminals.

        Standard resistance: 

        Check for open 

        TESTER CONNECTION SPECIFIED CONDITION CHART- CHECK FOR OPEN

        Tester Connection Specified Condition
        EFI relay terminal (1) - MREL (E4-8) Below 1 Ω

        Check for short 

        TESTER CONNECTION SPECIFIED CONDITION CHART - CHECK FOR SHORT

        Tester Connection Specified Condition
        EFI relay terminal (1) or MREL (E4-8) - 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 terminals.

        Standard resistance: 

        Check for open 

        TESTER CONNECTION SPECIFIED CONDITION CHART- CHECK FOR OPEN

        Tester Connection Specified Condition
        EFI relay terminal (2) - Body ground Below 1 Ω
      2. Reinstall the EFI relay to the engine room J/B.
      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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