Circuit Open/Short Inspection

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

Open circuit 

• If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
  • Throttle body terminal A and PCM terminal 2M
  • Throttle body terminal B and PCM terminal 2K
  • Throttle body terminal C and PCM terminal 2I
  • Throttle body terminal D and PCM terminal 2O
    Fig 1: Identifying Throttle Body Connector Terminals

    Courtesy of MAZDA MOTORS CORP.

Short circuit 

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