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Home >> Mazda >> 2007 >> 3 Mazdaspeed, 2.3 L >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (L3 With TC) >> Heated Oxygen Sensor (Ho2S) Inspection >> Front HO2S Circuit Open/Short Inspection (Sensor) >> Notes
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Front HO2S Circuit Open/Short Inspection (Sensor): Notes

  1. Disconnect the PCM connector.
  2. Disconnect the front HO2S connector.
  3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
    Fig 1: Identifying Front HO2S Connector Terminals
    G04955353Courtesy of MAZDA MOTORS CORP.
    Fig 2: PCM Connector Terminal Identification
    G04859829Courtesy of MAZDA MOTORS CORP.
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