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Home >> Toyota >> 2004 >> 4Runner Limited, 4.7 T, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (SFI) (2UZ-FE) - Diagnostics >> ECM Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE) 
    Fig 1: Inspecting ECM (+B Voltage)
    G02833649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.
    TESTER CONNECTION AND CONDITION SPECIFICATIONS

    Tester Connection Specified Condition
    +B (E8-1) - E1 (E6-1) 9 to 14 V

    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) 
    Fig 2: Checking Harness & Connector (ECM - Body Ground)
    G02833650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E6 ECM connector.
    2. Check the resistance between the wire harness side connectors.
      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      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) 
    Fig 3: Inspecting ECM (IGSW Voltage)
    G02833651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.
    TESTER CONNECTION AND CONDITION SPECIFICATIONS

    Tester Connection Specified Condition
    IGSW (E8-9) - E1 (E6-1) 9 to 14 V

    OK: Go To Step   6 

    NG: Go To Next Step 

  4. CHECK FUSE (IGN FUSE) 
    Fig 4: Checking Fuse (IGN Fuse)
    G02833652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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.

    NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

    OK: Go To Next Step 

  5. INSPECT IGNITION OR STARTER SWITCH ASSY 
    Fig 5: Inspecting Ignition Or Starter Switch Assy
    G02833653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the I18 ignition switch connector.
    2. Measure the resistance between the connector terminals shown in the chart below.
      SWITCH POSITION AND TESTER CONNECTION CONDITION SPECIFICATIONS

      Switch Position Tester Connection Specified Condition
      LOCK All Terminals 10 kΩ or higher
      ACC 2-3 Below 1 Ω
      ON 2-3, 2-4, 6-7 Below 1 Ω
      START 1 -2, 2-4, 6-7, 6-8 Below 1 Ω
    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) 
    Fig 6: Inspecting ECM (MREL Voltage)
    G02833654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E6 and E8 ECM connectors.
      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      MREL (E8-8) - E1 (E6-1) 9 to 14V

    NG: REPLACE ECM (See  REPLACEMENT  ) 

    OK: Go To Next Step 

  7. CHECK FUSE (EFI FUSE) 
    Fig 7: Checking Fuse (EFI Fuse)
    G02833655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the EFI fuse from the engine room R/B.
    2. Check for continuity in the EFI fuse.

      Standard: Continuity 

    3. Reinstall the EFI fuse.

    NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE 

    OK: Go To Next Step 

  8. INSPECT EFI RELAY 
    Fig 8: Inspecting EFI Relay
    G02833656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the EFI relay from the engine room R/B.
    2. Check for continuity in the EFI relay.
      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      1-2 Condition
      3-5 No Condition
      3-5 Condition (Apply battery voltage to terminal 1 and 2)
    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) 
    Fig 9: Checking Harness & Connector (EFI Relay - ECM, EFI Relay - Body Ground)
    G02833657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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.
        TESTER CONNECTION AND CONDITION SPECIFICATIONS

        Tester Connection Specified Condition
        Engine room R/B (EFI relay terminal 1) - MREL (E8-8) Below 1 Ω

        Standard (Check for short): 

        Fig 10: Disconnecting E8 ECM Connector
        G02833658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Reinstall the EFI relay.
      5. Reconnect the ECM connector.
      Fig 11: Identifying Tester Connection & Condition Specifications Chart
      G02833659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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.
        TESTER CONNECTION AND CONDITION SPECIFICATIONS

        Tester Connection Specified Condition
        Engine room R/B (EFI relay terminal 2) - Body ground Below 1 Ω
    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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