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 PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS AND FUEL - 1.6L - DTC P0630 TO DTC P2282DTC P2096 OR P2097CIRCUIT/SYSTEM TESTING
2008 Chevrolet Aveo LT, Automatic
Circuit/System Testing
2008 Chevrolet Aveo LT, AutomaticSECTION Circuit/System Testing
- Verify that none of the following conditions exist:
- Inspect the HO2S 1 and HO2S 2 for being secure
- Damaged wiring between either HO2S and the ECM
- Water intrusion in the HO2S harness connector
- Lean or rich fuel injectors-Refer to Fuel Injector Solenoid Coil Test
- Low or high fuel system pressure-Refer to Fuel System Diagnosis
- Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis
- Contaminated HO2S-For example, silicon
- Exhaust leaks near the HO2S
- Engine vacuum leaks
- If you find any of the above conditions, repair as necessary.
- Ignition OFF, disconnect the harness connector at the HO2S 2.
- Ignition ON, verify the scan tool HO2S 2 voltage parameter is between 350-550 mV.
- If less than the specified range, test the HO2S 2 high signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
- Connect the harness connector at the HO2S 2.
- Engine idling, raise the engine speed above 1,200 RPM for 30 seconds. Verify the scan tool HO2S 2 voltage parameter is greater than 60 mV.
- If less than the specified range, replace the HO2S 2.
- Engine idling, move the HO2S 1 and HO2S 2 harnesses between the HO2S harness connector and the ECM. Observe the scan tool HO2S 1 and 2 voltage parameter. Verify neither parameter changes abruptly.
- If the parameter changes abruptly, repair the harness/connections as necessary.
- If all circuits/connections test normal, replace the HO2S 1.
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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.