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Home >> Toyota >> 2007 >> Tundra Base, 4.0 U >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (1GR-FE) - System Testing, On-Vehicle Inspection, Removal, Inspection & Installation >> EFI Relay >> On-Vehicle Inspection

On-Vehicle Inspection

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    NOTE:
    • Some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
    • After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
  2. REMOVE INTEGRATION RELAY (UNIT E) 
    1. Remove the engine room relay block cover.
    2. Using a screwdriver, detach the 2 claws and disconnect the integration relay from the engine room relay block.

      HINT:

      Tape the screwdriver tip before use.

    3. Disconnect the 3 connectors.
      Fig 1: Identifying Integration Relay (Unit E)
      G05149628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT INTEGRATION RELAY (EFI RELAY) 
    NOTE:
    • Some relays are built into the integration relay (unit E). The integration relay cannot be disassembled. If there is a malfunction in the circuit of the integration relay, replace the integration relay.
    • The internal circuit of the integration relay is as shown in the illustration below. Inspect the integration relay using the following procedures.
      Fig 2: Integration Relay (Unit E) Inner Diagram
      G05149629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance of the EFI fuse.
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        EFI FUSE

        Tester Connection Condition Specified Condition
        EFI fuse Always Below 1 Ω

        If the result is not as specified, replace the EFI fuse.

    2. Measure the resistance of the EFI relay circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance 

        EFI RELAY CIRCUIT

        Tester Connection Condition Specified Condition
        1C-1 - 1B-4 When battery voltage is not applied between 1B-2 and 1B-3 10 kΩ or higher
        When battery voltage is applied between 1B-2 and 1B-3 Below 1 Ω
        1C-1 - 1B-5 When battery voltage is not applied between 1B-2 and 1B-3 10 kΩ or higher
        When battery voltage is applied between 1B-2 and 1B-3 Below 1 Ω
        Fig 3: Identifying Integration Relay Connector Terminals
        G05149633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the integration relay.

  4. INSTALL INTEGRATION RELAY (UNIT E) 
    1. Connect the 3 connectors.
    2. Install the integration relay to the engine room relay block.
    3. Install the engine room relay block cover.
  5. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
    NOTE: Some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
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