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Circuit Open/Short Inspection

Disconnect the PCM connector.
Disconnect the throttle body connector.
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