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 G3500, VAN CARGO, 4.8 VREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0342)DTC P0101CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 V
Circuit/System Testing
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 VSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
- If DTC P0405 is set, diagnose that DTC first.
- The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis. Use the DMM to perform this test. Refer to the DMM User Manual for the calibration procedure.
- Use the J 35616-200 for this test. If the J 35616-200 is not available, use a test lamp that measures more than 20 ohms.
- With the ignition ON, the engine OFF, the mass air flow (MAF) sensor disconnected, connect a test lamp between the MAF sensor 12-volt reference circuit and a good ground. Measure the voltage of the MAF sensor 12-volt reference circuit at the probe end of the test lamp, with a DMM connected to a good ground.
- If the voltage is less than battery voltage, test the circuit for a high resistance or a faulty ECM.
- With the MAF sensor still disconnected, use the scan tool to observe the MAF Sensor parameter.
- If the MAF Sensor parameter is more than 0 volts, test the MAF sensor signal circuit for a short to voltage or a faulty ECM.
- Connect a jumper wire between the MAF sensor signal circuit and the IAT sensor signal circuit. Use a scan tool to observe the MAF Sensor parameter for the proper value of more than 4.7 volts and 500 g/s.
- If the MAF Sensor parameter is less than 4.7 volts and 500 g/s, test the MAF sensor signal circuit for a high resistance or a faulty ECM.
- Turn OFF the ignition, and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement. With a DMM, measure the resistance between the low reference circuit of the MAF sensor and a good ground.
- If the resistance is more than 1.5 ohms, test the circuit for a high resistance or a faulty ECM.
- If the MAF sensor circuits test normal, replace the MAF sensor. Refer to Repair Instructions in this diagnostic.
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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.