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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS AND FUEL - 1.6L - DTC P0630 TO DTC P2282DTC P2A01CIRCUIT/SYSTEM TESTING
2008 Chevrolet Aveo LT, Automatic
Circuit/System Testing
2008 Chevrolet Aveo LT, AutomaticSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the HO2S 2.
- Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal and ground.
- HO2S 2 (Euro IV) low reference circuit terminal 3
- HO2S 2 (Non Euro IV) low reference circuit terminal 1
- If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
- Engine running, verify the scan tool HO2S 2 parameter is between 350-500 mV.
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Verify none of the following conditions exist:
- Rich fuel injectors-Refer to Fuel Injector Balance Test with Special Tool .
- Water intrusion in the HO2S harness connector.
- High fuel system pressure-Refer to Fuel System Diagnosis .
- Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Fuel saturation of the evaporative emission (EVAP) canister.
- Exhaust leaks near the HO2S.
- Contaminated HO2S-Silicon.
- If you find any of the above conditions, repair as necessary.
- If all circuits test normal, test or replace the HO2S.
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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.