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Home >> Mazda >> 2005 >> 3 i, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Middle Heated Oxygen Sensor (Ho2S) Inspection [CALIFORNIA Emission Regulation Applicable Model] >> Middle HO2S Circuit Open/Short Inspection (Heater) >> Notes

Middle HO2S Circuit Open/Short Inspection (Heater): Notes

  1. Disconnect the PCM connector.
  2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
    Fig 1: Identifying Middle HO2S Harness Connector
    G03636151Courtesy of MAZDA MOTORS CORP.
    Fig 2: Identifying Main Relay Harness Connector
    G03636131Courtesy of MAZDA MOTORS CORP.
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