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 MANUALSCHEVROLET2006RV CUTAWAY 6.6 2REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0342DTC P0230CIRCUIT/SYSTEM TESTING
2006 Chevrolet RV Cutaway 6.6 2
Circuit/System Testing
2006 Chevrolet RV Cutaway 6.6 2SECTION Circuit/System Testing
- Turn OFF the ignition.
- Remove the fuel pump relay and turn ON the ignition, with the engine OFF.
- Probe the control circuit of the fuel pump relay with a test lamp that is connected to a good ground.
- Command the fuel pump ON and OFF with a scan tool.
- If the test lamp remains illuminated, test the fuel pump relay control circuit for a short to voltage or a faulty ECM.
- If the test lamp does not turn ON and OFF with each command, test the fuel pump relay control circuit for a short to ground, an open, or a faulty ECM.
- Connect a test lamp between the control circuit of the fuel pump relay and the ground circuit of the relay.
- Command the fuel pump ON and OFF with a scan tool.
- If the test lamp does not turn ON and OFF with each command, test the fuel pump relay ground circuit for an open or high resistance.
- If the test lamp turns ON and OFF with each command, replace the fuel pump relay.
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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.