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 MANUALSGMC2009CANYON 4D PICKUP, 2.9 9REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 15 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 3.7L - DTC P1400 TO DTC P2635)DTC P2635CIRCUIT/SYSTEM TESTING
2009 GMC Canyon 4D Pickup, 2.9 9
Circuit/System Testing
2009 GMC Canyon 4D Pickup, 2.9 9SECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Verify that DTCs P0192, P0193, P0231, P0232, or P023F are not set as current or history.
- If the DTCs are set, refer to DTC P0192 or P0193 or DTC P0231, P0232, or P023F .
- Ignition OFF, disconnect the harness connector at the fuel tank pump module.
- Ignition ON, test for less than 5.0 ohms between the fuel pump module low reference circuit terminal A and ground.
- If greater than the specified range, test the fuel pump module low reference circuit for a high resistance. If the circuit tests normal, replace the FPCM.
- Ignition OFF, install a test lamp between the control circuit terminal D and the control circuit terminal A.
- Ignition ON, command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the FPCM.
- If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FPCM.
- Perform the Fuel System Diagnosis
to verify proper fuel pressure.
- If the fuel pressure is not normal, replace the fuel tank fuel pump module.
- If the fuel system components test normal, refer to Symptoms - Engine Controls .
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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.