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.
Exhaust Gas RECIRCULATION (EGR): Notes
PCM controls EGR system based on engine operating conditions. On Maxima and Sentra, PCM controls ground circuits for EGR Volume Control Valve (EGR-VCV). On all models except Maxima and Sentra, PCM controls ground circuit for EGR Control (EGRC) solenoid. See Fig 1 and Fig 2 . EGR-VCV or EGRC solenoid remains closed under certain conditions including the following:
- Engine stopped.
- Engine starting.
- Engine idling.
- Low engine coolant temperature.
- Excessively high engine coolant temperature.
- High engine speed.
- Mass airflow sensor malfunction.
Use the Manual With the Right Hardware
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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.