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.
Circuit Description
The EGR valve is controlled by an ECM-operated solenoid. The solenoid is normally closed. The ECM provides a ground to energized the solenoid which allows vacuum to flow to the EGR valve.
The ECM monitor EGR effectiveness by de-energizing the EGR control solenoid, thereby shutting off vacuum to the EGR valve diaphragm. With the EGR valve closed, fuel integrator counts will be greater than they were during normal EGR operation. If the change is not within the "calibrated window", Code 32 will be set.
The ECM checks EGR operation when vehicle speed is over 50 MPH, engine vacuum is 11.8-51.1 in. Hg, and throttle position is constant (no change during check sequence).
NO RELATED
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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.