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ECM Power Source Circuit: Procedure

  1. INSPECT ECM (+B, +B1 VOLTAGE) 
    1. Turn the engine switch on (IG).
      Fig 1: Identifying E7 And A6 Connector
      GTY104222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Specified Condition
      A6-6 (+B) - E7-7 (E1) 9 to 14 V
      A6-5 (+B1) - E7-7 (E1) 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 E7 ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      E7-7 (E1) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT ECM (IGSW VOLTAGE) 
    1. Turn the engine switch on (IG).
      Fig 2: Identifying A6 And E7 ECM Connectors
      GTY104584Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Specified Condition
      A6-17 (IGSW) - E7-7 (E1) 9 to 14 V

    OK → See step   6 

    NG: Go to next step 

  4. CHECK FUSE (IGN FUSE) 
    1. Remove the IGN fuse from the cowl side junction block RH.
      Fig 3: Identifying IGN Fuse
      GTY104671Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the IGN fuse.

      Standard resistance

      Below 1 Ω

    NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to next step 

  5. INSPECT IG2 RELAY 
    1. Remove the IG2 relay from the engine room No. 2 relay block.
      Fig 4: Inspecting A/F Relay
      GTY100984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage applied between terminals 1 and 2)

    NG → REPLACE IG2 RELAY 

    OK → GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START 

  6. INSPECT ECM (MREL VOLTAGE) 
    1. Turn the engine switch on (IG).
      Fig 5: Identifying A6 And E7 ECM Connectors
      GTY104027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Specified Condition
      A6-13 (MREL) - E7-7 (E1) 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 No. 2 junction block.
      Fig 6: Identifying EFI Fuse From Engine Room No. 2 Junction Block
      GTY104677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the EFI fuse.

      Standard resistance

      Below 1 Ω

    NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to next step 

  8. INSPECT INTEGRATION NO. 1 RELAY (EFI MAIN RELAY) 
    1. Remove the integration relay from the engine room No. 2 junction block.
      Fig 7: Checking Harness And Connector (INJ Relay - EFI Main Relay)
      GTY287960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      2C-1 - 2A-8 10 kΩ or higher
      Below 1 Ω
      (when battery voltage applied between terminals 2A-6 and 2A-7)

    NG → REPLACE INTEGRATION NO. 1 RELAY 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY- ECM, INTEGRATION RELAY - BODY GROUND) 
    1. Check the harness and the connectors between the integration relay and the ECM.
      1. Remove the integration relay from the engine room No. 2 junction block.
      2. Disconnect the A6 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open)

        Tester Connection Specified Condition
        2A-6 - A6-13 (MREL) Below 1 Ω

        Standard resistance (Check for short)

        Tester Connection Specified Condition
        2A-6 or A6-13 (MREL) - Body ground 10 kΩ or higher
    2. Check the harness and the connectors between the integration relay and body ground.
      1. Remove the integration relay from the engine room No. 2 junction block.
      2. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open)

        Tester Connection Specified condition
        2A-7 - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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