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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 E47 and B3 ECM connectors.
      Fig 1: Identifying E47 & B3 ECM Connectors
      G05108915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATIONS

      Tester Connections Specified Conditions
      +B (E47-1) - E1 (B3-1) 11 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 B3 ECM connector.
      Fig 2: Identifying B3 ECM Connector
      G05108916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance.

      Standard Resistance (Check for open) 

      TESTER CONNECTIONS AND SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      E1 (B3-1) - 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 ON.
    2. Measure the voltage between the terminals of the E47 and B3 ECM connectors.
      Fig 3: Identifying E47 & B3 ECM Connectors
      G05108917Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATIONS

      Tester Connections Specified Conditions
      IGSW (E47-9) - E1 (B3-1) 11 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. Check the IGN fuse resistance.

      Standard Resistance: 

      Below 1 Ω 

    3. Reinstall the IGN fuse.
      Fig 4: Identifying IGN Fuse
      G05108918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK FOR SHORT 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 A1 ignition switch connector.
    2. Check the resistance.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      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
      Fig 5: Identifying A1 Ignition Switch Connector Terminals
      G05108919Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the ignition switch connector.

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

    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 B3 and E47 ECM connectors.
      Fig 6: Identifying B3 & E47 ECM Connectors
      G05108920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATIONS

      Tester Connections Specified Conditions
      MREL (E47-8) - E1 (B3-1) 11 to 14 V

    NG: REPLACE ECM  (See REMOVAL  )

    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.
      Fig 7: Identifying EFI Fuse
      G05108921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: CHECK FOR SHORT 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. Check the EFI relay resistance.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATIONS

      Tester Connections Specified Conditions
      3 - 5 10 kΩ or higher
      Below 1 Ω (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the EFI relay.
      Fig 8: Identifying EFI Relay
      G04942976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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.
      1. Remove the EFI relay from the engine room R/B.
      2. Disconnect the E47 ECM connector.
      3. Check the resistance.

        Standard Resistance (Check for open) 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        EFI relay (1) - MREL (E47-8) Below 1 Ω

        Standard Resistance (Check for short) 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        EFI relay (1) or MREL (E47-8) - 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) 

        TESTER CONNECTIONS AND SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        EFI relay (2) - Body ground Below 1 Ω
        Fig 9: Identifying EFI Relay & E47 ECM Connector
        G05108923Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Reinstall the EFI relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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