Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION ).
2. Disconnect the throttle body connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
   Fig 1: Identifying Throttle Body Wiring Harness-Side Connector Terminals

   Courtesy of MAZDA MOTORS CORP.
   Fig 2: Identifying PCM Wiring Harness-Side 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 2AP
  • 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 C and power supply
  • Throttle body terminal D and body ground
  • Throttle body terminal D and power supply
  • Throttle body terminal E and body ground
  • Throttle body terminal F and body ground
  • Throttle body terminal F and power supply