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 304 (ENGINE CONTROL SYSTEM - 3.8L - DTC P0451 TO DTC P2120)DTC P0685COMPONENT TESTING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Component Testing
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Component Testing
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- Measure for 70-110 ohms between terminals 85 and 86 of the relay.
- If the resistance is not within the specified range, replace the relay.
- Measure for infinite resistance between terminals 30 and 86 of the relay.
- If continuity is detected, replace the relay.
- Measure for infinite resistance between terminals 30 and 87 of the relay.
- If continuity is detected, replace the relay.
- Measure for infinite resistance between terminals 30 and 85 of the relay.
- If continuity is detected, replace the relay.
- Measure for infinite resistance between terminals 85 and 87 of the relay.
- If continuity is detected, replace the relay.
- Connect a 20-amp fused jumper wire from the battery positive cable at the battery, to relay terminal 85. Connect a jumper wire from the negative battery cable at the battery, to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay, with a DMM.
- If the resistance measures more than 2 ohms, replace the relay.
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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.