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Circuit Open/Short Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION .)
  2. 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
          G00973072Courtesy 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
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