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A/F Sensor Heater Relay: Inspection

  1. REMOVE A/F SENSOR HEATER RELAY 
    Fig 1: Identifying Engine Room Relay Box
    G02636170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT A/F SENSOR HEATER RELAY 
    1. Using an ohmmeter, check for continuity between each terminal.

      Specified condition: 

      TERMINAL AND SPECIFIED CONDITION SPECIFICATION

      Terminal No. Specified condition
      1 - 2 Continuity
      3 - 5 No continuity
    2. Using an ohmmeter, check for continuity between terminals 3 and 5 when the battery voltage is applied across terminals 1 and 2.
      Fig 2: Checking Continuity Between Terminals 3 And 5
      G02636171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Specified condition: Continuity 

  3. INSTALL A/F SENSOR HEATER RELAY 
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