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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 156 (ENGINE CONTROLS AND FUEL - 3.5L - DTC P0010 TO DTC P0333)DTC P0010CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
You must complete the Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition OFF, disconnect the CMP actuator solenoid harness connector at the CMP actuator solenoid.
- Test for less than 1 ohm between the low reference circuit and ground.
- If greater than 1 ohm, test the low reference for an open/high resistance. If the circuit tests normal replace the ECM.
- Connect a test lamp between the high control circuit and the low reference circuit.
- Command the CMP actuator solenoid ON and OFF. The test lamp should turn ON and OFF when changing between commanded states.
- If the test lamp is always ON, test the high control circuit for a short to voltage. If the circuit tests normal replace the ECM.
- If test lamp is always OFF, test the control circuit for a short to ground, an open/high resistance. If the circuit tests normal replace the ECM.
- If all circuits test normal, test or replace the CMP actuator solenoid.
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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.