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 MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 616 (ENGINE CONTROLS AND FUEL - 2.2L (L61) - DTC P0016 TO DTC P0418)DTC P0411CIRCUIT/SYSTEM TESTING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Circuit/System Testing
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Circuit/System Verification MUST be performed first or misdiagnosis may result.
- Ignition ON, observe that the AIR pump is not activated.
- If the AIR pump is activated, test the AIR pump voltage supply circuit for a short to voltage. If the circuit tests normal, test the AIR pump relay control circuit for a short to ground. If the circuits test normal, test the AIR pump relay. If the relay and circuits test normal, replace the ECM.
- Ignition ON, enable the AIR pump with a scan tool and observe that the AIR pump is activated.
- If the AIR pump is not activated, test the AIR pump voltage supply and ground circuits for more than 2 ohms of resistance. If the circuits test normal, test both AIR pump relay voltage supply circuits for an open/high resistance or a short to ground. If AIR pump relay voltage supply circuits test normal, test the AIR pump relay control circuit for an open/high resistance or a short to voltage. If the AIR pump relay control circuit tests normal, test the AIR pump relay. If the relay and all circuits test normal, test the AIR pump. If the relay, pump, and circuits test normal, replace the ECM.
- Disconnect the AIR pump outlet hose from the AIR solenoid inlet.
- Engine running, enable the AIR pump with a scan tool and verify pressurized airflow at the hose outlet.
- If pressurized airflow is not detected, test the AIR pump inlet and outlet hoses/pipes for a restriction. If the inlet and outlet hoses/pipes test normal, replace the AIR pump.
- Engine OFF, disconnect the AIR solenoid.
- Connect a test lamp between the AIR solenoid voltage supply and ground circuit terminals.
- Ignition ON, observe that the test lamp is not illuminated.
- If the test lamp is illuminated, test the AIR solenoid valve voltage supply circuit for a short to voltage. If the circuit tests normal, test the AIR solenoid valve relay control circuit for a short to ground. If the circuits test normal, test the AIR solenoid valve relay. If the relay and circuits test normal, replace the ECM.
- Ignition ON, enable the AIR solenoid with a scan tool and observe that the test lamp is illuminated.
- If the test lamp is not illuminated, test the AIR solenoid voltage supply circuit and both AIR solenoid relay voltage supply circuits for an open/high resistance or a short to ground. If the circuits test normal, test the AIR solenoid ground circuit for an open/high resistance. If the circuits test normal, test both AIR solenoid relay control circuits for an open/high resistance or a short to voltage. If the circuits test normal, test the AIR solenoid relay. If the relay and all circuits test normal, replace the ECM.
- Test the AIR solenoid outlet pipe for a restriction.
- If a restriction is detected, remove the restriction or replace the pipe.
- If all circuits and other components test normal, replace the AIR solenoid.
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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.