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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 A24 and B47 ECM connectors.
      Fig 1: Identifying ECM Connectors Terminals A24 And B47
      G04968592Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      +B(E8-1)-E1 (E6-1) 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 E6 ECM connector.
      Fig 2: Identifying E6 ECM Connector
      G04968593Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Measure the resistance between the terminal of the ECM connector and body ground.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

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

    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.
      Fig 3: Identifying E6 And E8 ECM Connectors Terminals
      G04968594Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      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) 
    1. Remove the IGN fuse from the driver side J/B.
    2. Measure the IGN fuse resistance.

      Standard resistance: 

      Below 1 Ω. 

      Fig 4: Identifying IGN Fuse
      G04968595Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    3. Reinstall the IGN 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. Disconnect the I18 ignition switch connector.
      Fig 5: Identifying I18 Ignition Switch Connector
      G04968596Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Check the resistance.

      Standard resistance 

      IGNITION SWITCH POSITIONS

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

    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.
      Fig 6: Identifying E6 And E8 ECM Connectors Terminals
      G04968597Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

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

    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 

      Fig 7: Identifying EFI Fuse
      G04968462Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    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 (EFI RELAY) 
    1. Remove the EFI relay from the engine room R/B.
    2. Check the EFI relay resistance.
      Fig 8: Identifying EFI Relay
      G04942983Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS

      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 

    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.
        Fig 9: Identifying EFI Relay And E8 ECM Connector
        G04968600Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      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) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

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

        Standard resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        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) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        EFI relay (2) - Body ground Below 1 Ω
      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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