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Circuit Open/Short Inspection

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

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

G05981155

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