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Home >> Scion >> 2005 >> tC Standard >> Repair and Diagnosis >> Engine Performance >> SFI System (2AZ-FE) >> ECM Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. INSPECT ECM (+B VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E4 and E6 ECM connectors.

      Standard: 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      +B (E4-1) - E1 (E6-1) Between 9V and 14V
      Fig 1: Identifying E1 ECM Connector
      G03064885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  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 E6 ECM connector.
    3. Check the resistance.

      Standard (Check for open): 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      E1 (E6-1) - Body ground Below 1 Ω
    4. Reconnect the ECM connector.
    5. Reconnect the negative battery cable.
      Fig 2: Identifying E6 ECM Connector
      G03064886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E4 and E6 ECM connectors.

      Standard: 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      IGSW (E4-9) - E1 (E6-1) Between 9V and 14V
      Fig 3: Measuring Voltage Between Terminals Of E4 And E6 ECM Connectors
      G03064887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to step   6 

    NG: Go to next step 

  4. CHECK FUSE (AM2) 
    1. Remove the AM2 fuse from the engine room R/B.
    2. Check the AM2 fuse resistance.
      1. Standard: Below 1 Ω 
    3. Reinstall the AM2 fuse.
    Fig 4: Identifying AM2 Fuse In Engine Room R/B
    G03064888Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to next step 

  5. INSPECT IGNITION OR STARTER SWITCH ASSY 
    1. Disconnect the I5 ignition switch connector.
    2. Check the resistance.
      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Switch Positions Tester Connections Specified Conditions
      LOCK All Terminals 10 kΩ or higher
      ACC 2-3 Below 1 Ω
      ON 2-3, 2-4, 3-4, 6-7 Below 1 Ω
      START 1-2, 1-4, 2-4, 6-7, 6-8, 7-8 Below 1 Ω
    3. Reconnect the ignition switch connector.
      Fig 5: Identifying Ignition Switch Connector Terminal
      G03064889Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between the terminals of the E4 and E6 ECM connectors.

      Standard: 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      MREL (E4-8) - E1 (E6-1) Between 9V and 14V
      Fig 6: Measuring Voltage Between Terminals Of E4 And E6 ECM Connectors
      G03064890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE ECM (see  ECM (2AZ-FE)  ) 

    OK: Go to next step 

  7. CHECK FUSE (EFI) 
    1. Remove the EFI fuse from the engine room R/B.
    2. Check the EFI fuse resistance.
      1. Standard: Below 1 Ω 
    3. Reinstall the EFI fuse.
    Fig 7: Identifying EFI Fuse In Engine Room R/B
    G03064891Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      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.
      Fig 8: Identifying EFI Relay Terminals
      G03064892Courtesy 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 E4 ECM connector.
      3. Check the resistance.

        Standard (Check for open): 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Engine room R/B (EFI relay terminal 1) - MREL (E4-8) Below 1 Ω
        Engine room R/B (EFI relay terminal 3) - +B (E4-1) Below 1 Ω
        Fig 9: Identifying EFI Relay In Engine Room R/B
        G03064893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard (Check for short): 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Engine room R/B (EFI relay terminal 1) or MREL (E4-8) - Body ground 10 kΩ or higher
        Engine room R/B (EFI relay terminal 3) or +B (E4-1) - 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 (Check for open): 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Engine room R/B (EFI relay terminal 2) - Body ground Below 1 Ω
      3. Reinstall the EFI relay.
      Fig 10: Identifying E4 ECM Connector
      G03064894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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