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 MANUALSCHEVROLET2007HHR L4-2.2LREPAIR AND DIAGNOSISDIAGRAMSELECTRICAL DIAGRAMSPOWERTRAIN MANAGEMENTSYSTEM DIAGRAM
2007 Chevrolet HHR L4-2.2L
System Diagram
2007 Chevrolet HHR L4-2.2LSECTION System Diagram
ENGINE CONTROLS SCHEMATICS
Power, Ground, MIL, and DLC
Engine Data Sensors - 5-Volt and Low References
Engine Data Sensors - Pressure, Temperature, and MAF/IAT
Engine Data Sensors - HO2S
Engine Data Sensors - APP and TAC
Ignition System
Ignition Controls - Sensors
Fuel Controls
EVAP Controls
Controlled/Monitored Subsystem References
Locations: The locations for the Connectors, Grounds, Splices, and Grommets shown within these diagrams can be found via their numbers at Vehicle Locations. Locations
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.