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
EGR is used to lower oxides of nitrogen (NOx) emission levels. VCM controls EGR pintle position using inputs from TP and MAP sensors. Scan tool can be used to monitor desired EGR position.
VCM supplies 5-volt reference and ground signal to EGR valve. Feedback signal is the actual position of the EGR pintle. Actual EGR position should always be close to commanded desired EGR position.
Conditions for setting DTC:
- No ECT, EVAP, IAC, IAT, MAP or TP sensor DTCs set.
- DTC P0300, P1336 or P1404 not set.
- Ignition voltage greater than 11.7 volts.
- EGR commanded on (desired EGR position greater than zero percent).
- Actual EGR position differs from desired EGR position by greater than 9 percent for 18 seconds.
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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.