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On-Vehicle Inspection

NOTE:
  • The EFI MAIN and A/F relays are built into the integration relay.
  • Some relays are built into the integration relay. The integration relay cannot be disassembled. If there is a malfunction in the circuit of the integration relay, replace the integration relay.
  1. REMOVE INTEGRATION NO. 1 RELAY 
    1. Remove the engine room No. 1 relay block cover.
    2. Using a screwdriver, detach the 2 claws and disconnect the integration relay from the engine room No. 1 relay block.
      Fig 1: Disconnecting Integration Relay From Engine Room No. 1 Relay Block
      GTY238463Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      Tape the screwdriver tip before use.

    3. Disconnect the 3 connectors from the integration relay.
  2. INSPECT INTEGRATION NO. 1 RELAY (EFI MAIN RELAY) 
    1. Measure the resistance of the EFI MAIN fuse.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        EFI MAIN fuse Always Below 1 Ω

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

    2. Measure the resistance of the EFI MAIN relay circuit.
      Fig 2: Identifying Integration Relay
      GTY238565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        1C-1 - 1A-4 Battery voltage is not applied to terminals 1A-3 and 1A-2 10 kΩ or higher
        1C-1 - 1A-4 Battery voltage is applied to terminals 1A-3 and 1A-2 Below 1 Ω

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

  3. INSPECT INTEGRATION NO. 1 RELAY (A/F RELAY) 
    1. Measure the resistance of the A/F fuse.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        A/F fuse Always Below 1 Ω

        If the result is not as specified, replace the A/F fuse.

    2. Measure the resistance of the A/F relay circuit.
      Fig 3: Identifying Integration Relay
      GTY236514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        1C-1 - 1B-8 Battery voltage is not applied to terminals 1B-7 and 1B-6 10 kΩ or higher
        1C-1 - 1B-8 Battery voltage is applied to terminals 1B-7 and 1B-6 Below 1 Ω

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

  4. INSTALL INTEGRATION NO. 1 RELAY 
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