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 690 (DATA COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICECIRCUIT/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 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- Test for less than 1.0 ohm of resistance between the DLC ground circuit terminal 5 and ground.
- If greater than 1.0 ohm, test the ground circuit for open/high resistance.
- Ignition OFF, disconnect the X1 harness connector at the PCM.
- Test for less then 5 ohms between the class 2 serial data circuit terminal 16 and ground.
- If greater then the specified range, test the serial data circuit for a short to open/high resistance.
- Ignition ON, test for less then 1 volt between the serial data circuit terminal 16 and ground.
- If greater then the specified range, test the serial data circuit for a short to voltage.
- If all circuits test normal, replace the PCM.
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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.