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.
Chart C7 - EGR Check
The ECM operates a solenoid to control the EGR valve. This solenoid is normally closed. By providing a ground path, the ECM energizes the solenoid which then allows vacuum to pass to the EGR valve. The ECM control of the EGR is based on the following inputs:
- Engine coolant temperature above 25°C.
- TPS idle.
- MAP.
- Checks for a stuck open solenoid.
- Checks for solenoid always being energized.
- Grounding test terminal should energize solenoid and vacuum should drop.
- Negative backpressure valve should hold vacuum with the engine off.
- When the engine is started, exhaust backpressure should cause vacuum to bleed off and valve to fully close.
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.