LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2011 >> IS 250C Standard >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Control System (4GR-FSE) (Service Information) >> Integration Relay >> Inspection >> Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Integration Relay: Inspection: Inspection

  1. INSPECT INTEGRATION NO. 1 RELAY 
    NOTE:
    • Some relays are built into the integration relay (Unit A). 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. Inspect the integration relay using the following procedure.
      Fig 1: Identifying Internal Relay (Unit A) Inner Diagram
      GTY274768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance of the C/OPN relay.
      Fig 2: Identifying Integration Relay Backside
      GTY272763Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using an ohmmeter, measure the resistance between terminal.

        Standard Resistance

        Tester Connection Specified Condition
        2B-5 - 2B-8 10 kΩ or higher
      2. Connect a battery positive (+) lead to terminals 2B-5 and negative (-) lead to terminal 2B-7. Using an voltmeter, measure the resistance between terminal.

        Standard Voltage

        Tester Connection Specified Condition
        2B-7 - 2B-8 10 to 14V
    2. Measure the resistance of the EFI MAIN relay.
      Fig 3: Identifying Integration Relay Backside & EFI Main Relay
      GTY280158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the EFI fuse. Using an ohmmeter, measure the resistance between the terminals.

        Standard Resistance

        Tester Connection Specified Condition
        EFI fuse terminal 2 - 2A-8 10 kΩ or higher
      2. Connect a battery positive (+) lead to terminal 2A-6 and negative (-) lead to terminal 2A-7. Using an ohmmeter, measure the resistance between terminal.

        Standard Resistance

        Tester Connection Specified Condition
        EFI fuse terminal 2 - terminal 2A-8 Below 1 Ω
    3. Measure the resistance of the EFI NO. 2 relay.
      Fig 4: Identifying Integration Relay Backside & EFI No. 2 Relay
      GTY287528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the F/PMP fuse. Using an ohmmeter, measure the resistance between the terminals.

        Standard Resistance

        Tester Connection Specified Condition
        F-PMP fuse terminal 2 - 2B-4 10 kΩ or higher
      2. Connect a battery positive (+) lead to terminal 2A-8 and negative (-) lead to terminal 2B-3. Using an ohmmeter, measure the resistance between the terminals.

        Standard Resistance

        Tester Connection Specified Condition
        F-PMP fuse terminal 2 - 2B-4 Below 1 Ω
    4. Measure the resistance of the EFI INJ relay.
      Fig 5: Identifying Integration Relay Backside & EFI INJ Relay
      GTY282775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the INJ fuse. Using an ohmmeter, measure the resistance between the terminals.

        Standard Resistance

        Tester Connection Specified Condition
        INJ fuse terminal 2 - 2A-4 10 kΩ or higher
      2. Connect a battery positive (+) lead to terminal 2A-2 and negative (-) lead to terminal 2A-3. Using an ohmmeter, measure the resistance between the terminals.

        Standard Resistance

        Tester Connection Specified condition
        INJ fuse terminal 2 - terminal 2A-4 Below 1 Ω
scientia non olet · About LEMON Manuals