Circuit Open/Short Inspection

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

Fig 1: Identifying Throttle Body And PCM Connector 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.

• Throttle body terminal C and PCM terminal 2P
• Throttle body terminal D and PCM terminal 2AL
• Throttle body terminal E and PCM terminal 2AO
• Throttle body terminal F and PCM terminal 2AK

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 E and body ground
• Throttle body terminal E and power supply
• Throttle body terminal F and body ground
• Throttle body terminal F and power supply
• Throttle body terminal D and body ground
• Throttle body terminal D and power supply