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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 E8 and E6 ECM connectors.

      Standard Voltage 

      STANDARD VOLTAGE REFERENCE

      Tester Connections Specified Conditions
      +B (E8-1) - E1 (E6-1) 9 to 14 V

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

    Fig 1: ECM Power Source Circuit Diagram
    G04407373Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

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

      Standard Resistance (Check for open) 

      STANDARD RESISTANCE REFERENCE (CHECK FOR OPEN)

      Tester Connections Specified Conditions
      E1 (E6-1) - Body ground Below 1 Ω
    3. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying E6 ECM Connector
    G04407374Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 E8 and E6 ECM connectors.

      Standard Voltage 

      STANDARD VOLTAGE REFERENCE

      Tester Connections Specified Conditions
      IGSW (E8-9) - E1 (E6-1) 9 to 14 V

    OK: Go to step   6 

    Fig 3: Measuring Voltage Between Terminals Of E8 & E6 ECM Connectors
    G04407375Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

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

      Standard Resistance: Below 1 Ω 

    3. Reinstall the IGN fuse.

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

    Fig 4: Removing IGN Fuse From Driver Side J/B
    G04407376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  5. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY 
    1. Disconnect the I7 ignition switch connector.
    2. Check the resistance.

      Standard Resistance 

      STANDARD RESISTANCE REFERENCE

      Ignition Switch Positions Tester Connections Specified Conditions
      LOCK All Terminals 10 kΩ or higher
      ACC 2-4 Below 1 Ω
      ON 1-2, 1-4, 5-6
      START 1-3, 1-4, 3-4, 5-6, 5-7, 6-7
    3. Reconnect the ignition switch connector.

    NG: REPLACE IGNITION OR STARTER SWITCH ASSEMBLY 

    Fig 5: Identifying I7 Ignition Switch Connector
    G04407377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK AND REPLACE 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 

      STANDARD VOLTAGE REFERENCE

      Tester Connections Specified Conditions
      MREL (E8-8) - E1 (E6-1) 9 to 14 V

    NG: REPLACE ECM 

    Fig 6: Identifying ECM Connector
    G04407378Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

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

      Standard Resistance: Below 1 Ω 

    3. Reinstall the EFI fuse.

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

    Fig 7: Removing EFI Fuse From Engine Room R/B
    G04407379Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

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

      Standard Resistance 

      STANDARD RESISTANCE REFERENCE

      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.

    NG: REPLACE EFI RELAY 

    Fig 8: Identifying Relay Test Terminals
    G04061617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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.

        Standard Resistance (Check for open) 

        STANDARD RESISTANCE REFERENCE (CHECK FOR OPEN)

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

        Standard Resistance (Check for short) 

        STANDARD RESISTANCE REFERENCE (CHECK FOR SHORT)

        Tester Connections Specified Conditions
        EFI relay (1) or MREL (E8-8) - Body ground 10 kΩ 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.

        Standard Resistance (Check for open) 

        STANDARD RESISTANCE REFERENCE (CHECK FOR OPEN)

        Tester Connections Specified Conditions
        EFI relay (2) - Body ground Below 1 Ω
      3. Reinstall the EFI relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 9: Identifying E8 ECM Connector
    G04407381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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