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Circuit Open/Short inspection

Disconnect the PCM connector.
Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

Fig 1: Identifying Knock Sensor Harness Side Connector Terminals
Courtesy of MAZDA MOTORS CORP.

Open circuit

If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- KS terminal A and PCM terminal 2U
- KS terminal B and PCM terminal 2V

Short circuit

If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- KS terminal A and power supply
- KS terminal A and body ground
- KS terminal B and power supply
- KS terminal B and body ground