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A/F Sensor Heater Relay: Inspection: Inspection

  1. INSPECT AIR FUEL RATIO SENSOR RELAY 
    1. Using an ohmmeter, measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying Air Fuel Ratio Sensor Relay Terminals
      GTY147009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester connection Specified Condition
      1A-3 - 1A-4 10 kΩ or higher
      1A-3 - 1A-4 Below 1 Ω (Battery voltage applied between terminals 1E-7 and 1E-10)