Circuit Open/Short Inspection

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

Open circuit 

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

Short circuit 

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
  • CMP sensor terminal A and power supply
  • CMP sensor terminal A and body ground
  • CMP sensor terminal B and power supply
  • CMP sensor terminal B and body ground
    Fig 1: Identifying CMP Sensor Connector Terminals

    Courtesy of MAZDA MOTORS CORP.