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 G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1898 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L LMM - DTC P02E7 TO DTC P0700)DTC P0335CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF and scan tool disconnected for 90 seconds, disconnect the harness connector at the CKP sensor.
- Test for less than 5 ohms between low reference circuit terminal 2 of the connector and ground.
- If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference 1 circuit terminal 3 of the connector and ground.
- If less than the specified range, test the 5-volt reference 1 circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the 5-volt reference 1 circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Test for 4.8-5.2 volts between the signal circuit terminal 1 of the connector and ground.
- If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
- If greater than the specified range, test the signal circuit for an a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition OFF, connect a 3A fused jumper wire between signal circuit terminal 1 of the connector and ground.
- Ignition ON, observe the scan tool 5-Volt Reference 1 Circuit Status parameter. The parameter should display OK.
- If the 5-Volt Reference 1 Circuit Status parameter does not display OK, test the signal circuit for a short to 5-volt reference 1. If the circuit tests normal, replace the ECM.
- Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal 1 of the connector. Connect the battery voltage supply to B+. Connect the black lead to ground.
- Set the J 38522 signal switch to 5 volts, the frequency to 5K, and the duty cycle to normal.
- Ignition ON, observe the CKP Sensor Signal Present parameter of the scan tool. The parameter should display YES.
- If the parameter does not display YES, replace the ECM.
- If the circuits test normal replace the CKP sensor.
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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.