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

Disconnect the PCM connector.
Disconnect the front HO2S connector.
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.