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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1736 (ENGINE CONTROLS AND FUEL - 3.5L - DTC P0010 TO DTC P0232)DTC P0230CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Testing
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Repair all U-codes before performing this diagnostic.
- Ignition OFF, disconnect the harness connectors at the ECM X1 and the FPCM.
- Ignition ON, test for 0 volts between the FPCM harness connector terminal 13 and ground.
- If greater than the specified voltage, test the fuel control enable signal circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the FPCM harness connector terminal 13 and ground.
- If less than the specified range, test the fuel control enable signal circuit for a short to ground.
- Ignition OFF, test for 1.0 ohm or less between the ECM harness connector X1 terminal 50 and FPCM harness connector terminal 13.
- If greater than the specified range, test the fuel control enable signal circuit for an open/high resistance.
- Reconnect the harness connectors at the ECM and the FPCM. Within 2 seconds of ignition ON, with a scan tool, verify that the Fuel Pump Command parameter displays ON.
- If the parameter does not display ON within the 2 seconds of ignition ON, replace the ECM.
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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.