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 MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 3 (ENGINE CONTROLS AND FUEL - 2.0L - INTRODUCTION (2 OF 2))DESCRIPTION AND OPERATIONELECTRONIC IGNITION (EI) SYSTEM DESCRIPTIONENGINE CONTROL MODULE (ECM)
2008 Chevrolet HHR LT, 2.4 P, Automatic
Engine Control Module (ECM)
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Engine Control Module (ECM)
WARNING: This page is about a different variant/trim than selected.
The ECM controls all of the ignition system functions, and constantly corrects the spark timing. The ECM monitors information from various sensor inputs that include the following:
- The throttle position (TP) sensor
- The engine coolant temperature (ECT) sensor
- The mass air flow (MAF) sensor
- The intake air temperature (IAT) sensor
- The vehicle speed sensor (VSS)
- The engine knock sensor (KS)
- The manifold absolute pressure (MAP) sensor
- The boost pressure sensor
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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.