Circuit Open/Short Inspection

1. Disconnect the PCM connector.
2. Disconnect the eccentric shaft position sensor connector.
3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

Fig 1: Identifying Eccentric Shaft Position Sensor And PCM Connector Terminals

Courtesy of MAZDA MOTORS CORP.

Open circuit 

• If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.

• Eccentric shaft position sensor terminal A and PCM terminal 2AG
• Eccentric shaft position sensor terminal B and PCM terminal 2AP

Short circuit 

• If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.

• Eccentric shaft position sensor terminal A and body ground
• Eccentric shaft position sensor terminal A and power supply
• Eccentric shaft position sensor terminal B and body ground
• Eccentric shaft position sensor terminal B and power supply