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

   Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Main Relay Connector

Courtesy of MAZDA MOTORS CORP.

Fig 3: PCM Connector Terminal Identification

Courtesy of MAZDA MOTORS CORP.