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Home >> Mazda >> 2009 >> 3 Mazdaspeed, 2.3 L >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (L3 With TC) >> Air Fuel Ratio (A/F) Sensor, Heated Oxygen Sensor (Ho2S) Inspection [L3 With TC] >> HO2S Circuit Open/Short Inspection >> Notes

HO2S Circuit Open/Short Inspection: Notes

Fig 1: Identifying Rear HO2S Connector Terminals
G04955356Courtesy of MAZDA MOTORS CORP.
Fig 2: PCM Connector Terminal Identification
G04859829Courtesy of MAZDA MOTORS CORP.
  1. Disconnect the PCM connector.
  2. Disconnect the HO2S connector.
  3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
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