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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 E3 and E6 ECM connectors.

      Standard voltage 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      +B (E6-1) - E1 (E3-5) Between 9 V and 14 V
      Fig 1: Identifying ECM (+B Voltage)
      G05192671Courtesy 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 negative battery cable.
    2. Disconnect the E3 ECM connector.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      E1 (E3-5) - Body ground Below 1 Ω
      Fig 2: Identifying Harness And Connector (ECM - Body Ground)
      G05192672Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the ECM connector.
    5. Reconnect the negative battery cable.

    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 E3 and E6 ECM connectors.

      Standard voltage 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      IGSW (E6-9) - E1 (E3-5) Between 9 V and 14 V
      Fig 3: Identifying ECM (IGSW Voltage)
      G05192673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  6

    NG: Go to next step 

  4. CHECK FUSE (AM2 FUSE) 
    1. Remove the AM2 fuse from the instrument panel J/B.
      2. Fig 4: Identifying Fuse (AM2 Fuse)
      G05192674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the AM2 fuse resistance.

      Standard resistance: 

      Below 1 Ω 

    3. Reinstall the AM2 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 I11 ignition switch connector.
      2. Fig 5: Identifying Ignition Switch Connector Terminals
      G05192675Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance.

      Standard resistance 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

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

    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 between the terminals of the E3 and E6 ECM connectors.

      Standard voltage 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      MREL (E6-8) - E1 (E3-5) Between 9 V and 14 V
      Fig 6: Inspecting ECM (MREL Voltage)
      G05232928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ECM 

    OK: Go to next step 

  7. CHECK FUSE (EFI AND EFI2) 
    1. Remove the EFI and EFI2 fuses from the engine room R/B.
      2. Fig 7: Identifying Fuse (EFI And EFI2)
      G05192677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the EFI and EFI2 fuses resistance.

      Standard resistance: 

      Below 1 Ω 

    3. Reinstall the EFI and EFI2 fuses.

    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 R/B.
      2. Fig 8: Identifying EFI Relay
      G05192678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the EFI relay resistance.

      Standard resistance 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      3 - 5 10 Ω or higher
      3 - 5 Below 1 Ω (when battery voltage is 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 Harness And Connector (EFI Relay - ECM, EFI Relay - Body Ground)
      G05192679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the EFI relay from the engine room R/B.
      2. Disconnect the E6 ECM connector.
      3. Check the resistance.

        Standard resistance (Check for open) 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Engine room R/B (EFI relay terminal 1) - MREL (E6-8) Below 1 Ω
        Engine room R/B (EFI relay terminal 3) - +B (E6-1) Below 1 Ω

        Standard resistance (Check for short) 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Engine room R/B (EFI relay terminal 1) or MREL (E6-8) - Body ground 10 kΩ or higher
        Engine room R/B (EFI relay terminal 3) or +B (E6-1) -Body ground 10 kΩ or higher
      4. Reconnect the ECM connector.
      5. Reinstall the EFI relay.
    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) 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        Engine room R/B (EFI relay terminal 2) - Body ground Below 1 Ω
      3. Reinstall the EFI relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK HARNESS AND CONNECTOR (TERMINAL 5 OF EFI RELAY - BATTERY POSITIVE TERMINAL) 

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