Circuit Open/Short Inspection

WARNING: This page is about a different variant/trim than selected.

Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION ).
Inspect the following wiring harnesses for open or short circuit (continuity check).

Fig 1: Identifying EGR Valve & Main Relay Connector Terminals
Courtesy of MAZDA MOTORS CORP.

Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
  - EGR valve terminal E and PCM terminal 4D
  - EGR valve terminal A and PCM terminal 4G
  - EGR valve terminal B and PCM terminal 4J
  - EGR valve terminal F and PCM terminal 4M
  - EGR valve terminal C or D and main relay terminal C
    
    Fig 2: PCM Connector Terminal Identification
    Courtesy of MAZDA MOTORS CORP.
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
  - EGR valve terminal E and Ground
  - EGR valve terminal A and Ground
  - EGR valve terminal B and Ground
  - EGR valve terminal F and Ground
  - EGR valve terminal C or D and power supply
Remove the EGR valve, and inspect for any damage or clogging.
- If there is no damage or clogging, replace the EGR valve.