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 719 (ENGINE CONTROLS AND FUEL - 2.0L - DTC P0243 TO DTC P0700)DTC P0351-P0354CIRCUIT/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 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the affected ignition coil/module.
- Ignition OFF for 90 seconds, disconnect the ECM connector X1.
- Test for less than 5.0 ohms between the ignition coil/module IC circuit terminal 3 and the appropriate ECM terminal listed below:
- IC 1 circuit: terminal 55
- IC 2 circuit: terminal 80
- IC 3 circuit: terminal 79
- IC 4 circuit: terminal 56
- If greater than the specified range, test the IC circuit for an open/high resistance.
- Connect the ECM.
- Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
- Start the engine and observe the scan tool.
- If the DTC or the misfire transfers with the suspect ignition/coil module, replace as needed.
- If the DTC or the misfire does not transfer with the suspect ignition/coil module, replace the ECM.
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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.