Circuit Open/Short Inspection

1. Disconnect the PCM connectors.
2. Disconnect the APP sensor connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
   Fig 1: Identifying PCM Connectors Terminals

   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.
  • APP sensor terminal A and PCM terminal 1AE
  • APP sensor terminal B and PCM terminal 1Y
  • APP sensor terminal C and PCM terminal 1AA
  • APP sensor terminal D and PCM terminal body ground
  • APP sensor terminal E and PCM terminal 1AL
  • APP sensor terminal F and main relay terminal C

Short circuit 

• If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
  • APP sensor terminal A and body ground
  • APP sensor terminal A and power supply
  • APP sensor terminal B and body ground
  • APP sensor terminal B and power supply
  • APP sensor terminal C and power supply
  • APP sensor terminal D and power supply
  • APP sensor terminal E and body ground
  • APP sensor terminal E and power supply
  • APP sensor terminal F and power supply
  • APP sensor terminal F and body ground