Lexus IS250 · Service Manual ENGINE

INSPECTION

Inspection


INSPECT INTEGRATION RELAY

NOTICE:
  1. 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.

  2. The internal circuit of the integration relay is as shown in the illustration. Inspect the integration relay using the following procedures.

    A107649E04

  1. A106666E03
    Measure the resistance of the C/OPN relay.

    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 the battery's 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 - 14V

  1. A106667E02
    Measure the resistance of the EFI MAIN relay.

    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 the battery's 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

  1. A127819E01
    Measure the resistance of the EFI NO. 2 relay.

    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 the battery's 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

  1. A106668E02
    Measure the resistance of the EFI INJ relay.

    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 the battery's 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

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