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A/F Sensor Heater Relay: Inspection

  1. REMOVE RELAY BOX COVER 
  2. REMOVE A/F SENSOR HEATER RELAY (Marking: A/F HTR) 
  3. INSPECT A/F SENSOR HEATER RELAY CONTINUITY 
    Fig 1: Inspecting A/F Sensor Heater Relay Continuity
    G02650646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using an ohmmeter, check that there is continuity between terminals 1 and 2.

      If there is no continuity, replace the relay.

    2. Check that there is no continuity between terminals 3 and 5.

      If there is continuity, replace the relay.

  4. INSPECT A/F SENSOR HEATER RELAY OPERATION 
    1. Apply battery voltage across terminals 1 and 2.
    2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
      3. Fig 2: Checking Continuity Between Terminals 3 And 5
      G02650647Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If there is no continuity, replace the relay.

  5. REINSTALL A/F SENSOR HEATER RELAY 
  6. REINSTALL RELAY BOX COVER 
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