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.
Circuit/System Verification
2009 GMC Canyon 4D Pickup, 2.9 9SECTION Circuit/System Verification
WARNING: This page is about a different variant/trim than selected.
- If DTCs P0685, P0689, or P0690 are set, diagnose those DTCs first.
- Ignition ON, engine OFF, observe the Ignition 1 Voltage Signal and the EC Ignition Relay Feedback Signal parameters on the scan tool. Both parameter values should display no more than 3 volts difference between the 2 parameters.
- Ignition OFF, observe the Ignition 1 Voltage Signal parameter on the scan tool. The parameter value should be 0 volts before the ECM powers down.
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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.