Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALAUXILIARY EMISSION CONTROL SYSTEMSEMISSION SYSTEM (L3, AJ)EGR VALVE INSPECTION [L3]CIRCUIT OPEN/SHORT INSPECTION

2006 Mazda 6 i, 4D Sedan, Automatic

Circuit Open/Short Inspection

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Circuit Open/Short Inspection

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 2K
  - EGR valve terminal A and PCM terminal 2G
  - EGR valve terminal B and PCM terminal 2L
  - EGR valve terminal F and PCM terminal 2H
  - 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 GND
  - EGR valve terminal A and GND
  - EGR valve terminal B and GND
  - EGR valve terminal F and GND
  - 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 no clogging, replace the EGR valve.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.