Circuit Open/Short Inspection

Fig 1: Identifying CMP Sensor Wiring Harness-Side Connector Terminals

Courtesy of MAZDA MOTORS CORP.

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION ).
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity Inspection)
   Fig 2: Identifying PCM Wiring Harness-Side Connector Terminals

   Courtesy of MAZDA MOTORS CORP.

Open circuit 

• If there is no continuity, the circuit is open. Repair or replace the wiring harness.
  • CMP sensor terminal A and PCM terminal 2P
  • CMP sensor terminal B and PCM terminal 2S
  • CMP sensor terminal C and PCM terminal 2AM

Short circuit 

• If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
  • CMP sensor terminal A and power supply
  • CMP sensor terminal B and power supply
  • CMP sensor terminal B and body ground
  • CMP sensor terminal C and body ground