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ECM Communication Stop Mode: Procedure

  1. INSPECT EFI RELAY (Marking: EFI) 
    1. Remove the EFI relay from the engine room No. 2 relay block.
    2. Measure the resistance of the relay.
      Fig 1: Identifying EFI Relay
      GTY140425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

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

    NG → REPLACE EFI RELAY 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (EFI RELAY - ECM, BATTERY AND BODY GROUND) 
    1. Remove the EFI relay from the engine room No. 2 relay block.
    2. Disconnect the E4 and E6 ECM connectors.
      Fig 2: Identifying EFI Relay And E4, E6 Connector Terminals
      GTY112924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage of the wire harness side connector.

      Standard voltage

      Tester Connection Specified Condition
      EFI relay terminal 5 - Body ground 10 to 14 V
    4. Measure the resistance of the wire harness side connectors.

      Standard resistance

      Tester Connection Specified Condition
      EFI relay terminal 2 - E6-13 (MREL) Below 1 Ω
      EFI relay terminal 1 - Body ground Below 1 Ω
      EFI relay terminal 3 - E6-6 (+B) Below 1 Ω
      EFI relay terminal 3 - E6-5 (+B1) Below 1 Ω
      E4-2 (E01) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK → REPLACE ECM 

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