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 MANUALSCHEVROLET2008AVEO LT, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS AND FUEL - 1.6L - INTRODUCTION (2 OF 2)DESCRIPTION AND OPERATIONEXHAUST GAS RECIRCULATION (EGR) SYSTEM DESCRIPTIONEGR VALVE CIRCUITS
2008 Chevrolet Aveo LT, Automatic
EGR Valve Circuits
2008 Chevrolet Aveo LT, AutomaticSECTION EGR Valve Circuits
| Callout | Component Name |
|---|---|
| 1 | Position Sensor |
| 2 | Coil Assembly |
| 3 | Base |
| 4 | Pintle |
| 5 | Exhaust In Port |
| 6 | Armature |
The exhaust gas recirculation (EGR) valve consists of the following circuits:
- An ignition 1 voltage circuit which supplies 12 volts to the coil of the EGR valve
- Two control circuits which grounds the coil of the EGR valve-The control circuit is a pulse width modulated (PWM) ground produced by an internal low side driver of the engine control module (ECM).
- A 5-volt reference circuit supplied from the ECM to the internal position sensor of the EGR valve
- A signal circuit which sends a feedback voltage from the internal position sensor of the EGR valve to the ECM-This voltage varies depending on the position of the EGR valve pintle. The ECM interprets this voltage as the position of the EGR valve pintle.
- A low reference circuit supplied from the ECM to the internal position sensor of 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.