Circuit Open/Short Inspection

Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION .)
Inspect the following wiring harnesses for open or short circuit (continuity check).
1. Open circuit
  - If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
    - EGR valve terminal A and PCM terminal 2AR
    - EGR valve terminal B and PCM terminal 2AY
    - EGR valve terminal E and PCM terminal 2AU
    - EGR valve terminal F and PCM terminal 2AV
    - EGR valve terminal C and main relay terminal B
    - EGR valve terminal D and main relay terminal B
      
      Fig 1: Identifying EGR Valve & PCM Connector Terminals
      Courtesy of MAZDA MOTORS CORP.
2. Short circuit
  - If there is continuity, there is a short circuit. Repair or replace the wiring harness.
    - EGR valve terminal A and body GND
    - EGR valve terminal B and body GND
    - EGR valve terminal E and body GND
    - EGR valve terminal F and body GND