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 DIAGNOSISENGINE MECHANICALSTARTERBATTERY, CHARGING SYSTEM AND STARTING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC P1668CIRCUIT/SYSTEM TESTING
2008 Chevrolet HHR LT, 2.4 P, Automatic
Circuit/System Testing
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Circuit/System Testing
- Ignition ON, engine OFF. Disconnect the generator harness connector.
- Measure the voltage of the generator turn on signal circuit terminal 1. Verify the circuit has less than 1 volt.
- If greater than the specified value, test the generator turn on signal circuit for a short to voltage, or replace the ECM.
- Engine running. Measure the voltage of the generator turn on signal circuit terminal 1. Verify the circuit has greater than 3.5 volts.
- If less than 3.5 volts, test the generator turn on signal circuit for a short to ground, an open or a high resistance, or replace the ECM.
- Refer to Charging System Test .
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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.