Circuit Open/Short Inspection

1. Disconnect the PCM connector.
2. Inspect the following wiring harness for an open or short circuit. (Continuity inspection)
   Fig 1: Identifying MAP Sensor 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.
  • MAP sensor terminal A and PCM terminal 2AA
  • MAP sensor terminal D and PCM terminal 2AL
  • MAP sensor terminal C and PCM terminal 2W

Short circuit 

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
  • MAP sensor terminal A and power supply.
  • MAP sensor terminal C and body ground.
  • MAP sensor terminal D and power supply.
  • MAP sensor terminal D and body ground