Rear HO2S Circuit Open/Short Inspection (Sensor): Notes

Fig 1: Identifying Rear HO2S Connector Terminals

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying PCM Sensor Connector Terminals

Courtesy of MAZDA MOTORS CORP.

1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)