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Home >> Mazda >> 2007 >> 3 Mazdaspeed, 2.3 L >> Repair and Diagnosis >> External Pages >> Different car >> Section 559 (Engine Control System) >> Front Heated Oxygen Sensor (Ho2S) Inspection >> Front HO2S Circuit Open/Short Inspection >> Notes
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Front HO2S Circuit Open/Short Inspection: Notes

WARNING: This page is about a different car, the 2007 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION  .)
  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 Terminals
    G04323055Courtesy of MAZDA MOTORS CORP.
    Fig 2: Identifying PCM Harness Side Connector
    G04323056Courtesy of MAZDA MOTORS CORP.
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