A/F SENSOR HEATER RELAY > ON-VEHICLE INSPECTION

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1. REMOVE INTEGRATION RELAY (UNIT E)

  1. Remove the engine room relay block cover.



    A155875

  1. Using a screwdriver, detach the 2 claws and remove the integration relay from the engine room relay block.

    HINT:
    Tape the screwdriver tip before use.

  1. Disconnect the 3 connectors.



2. INSPECT INTEGRATION RELAY (A/F)


NOTICE:
  1. 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.
  2. The internal circuit of the integration relay is as shown in the illustration below. Inspect the integration relay using the following procedures.


A186178E01

  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.


    A106666E14

  1. Measure the resistance of the A/F sensor heater relay circuit.

    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      1C-1 - 1A-4
      		When battery voltage is not applied to terminals 1A-2 and 1A-3
      		10 kΩ or higher
      When battery voltage is applied to terminals 1A-2 and 1A-3
      		Below 1 Ω
      If the result is not as specified, replace the integration relay.


3. INSTALL INTEGRATION RELAY (UNIT E)

  1. Connect the 3 connectors.

  1. Install the integration relay to the engine room relay block.

  1. Install the engine room relay block cover.