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 385 (ENGINE CONTROL SYSTEM - 3.5L - DTC P0442 TO DTC P2A01)DTC P1682CIRCUIT/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 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- With the ignition OFF, remove and the ETC fuse from the underhood electrical center and inspect it.
- If the fuse is open, test the Ignition 1 Voltage circuit from the ETC fuse to the ECM for a short to ground or for a faulty ECM.
- Remove the powertrain relay from the underhood electrical center. Connect a test lamp between the B+ terminal to the switch side of the relay and ground. The test lamp should illuminate.
- If the test lamp does not illuminate, repair the open in the B+ feed circuit to the powertrain relay.
- Install the powertrain relay.
- With the ignition ON and the engine OFF, probe each side of fuse block terminals of the ETC fuse, with a test lamp connected to ground. The test lamp should illuminate on one side of the terminals.
- If the test lamp does not illuminate. test the circuit from the powertrain relay to the ETC fuse for an open/high resistance, or for a faulty powertrain relay.
- If the test lamp illuminates on both terminals, test the Ignition 1 Voltage circuit between the ETC fuse and the ECM for a short to voltage or for a faulty ECM.
- Connect a fused jumper wire to a B+ source.
- Observe the EC Ignition Relay Feedback Signal parameter on the scan tool. Probe the ECM side of the ETC fuse terminal with the jumper wire. The parameter should be more than 10 volts.
- If the voltage is less than 10 volts, inspect the electrical center for corrosion or spread terminals, test the Ignition 1 Voltage circuit between the ETC fuse and the ECM for an open/high resistance, or for a faulty ECM. All circuit resistance should measure less than 3 ohms.
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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.