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 700 (ENGINE CONTROLS AND FUEL - 3.6L - DTC P0201 TO DTC P0629)DTC P0442CIRCUIT/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 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Refer to the EN 41413-A: EEST operation manual for detailed instructions in Evaporative Emission System Diagnosis .
- Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
- Ensure that the underbody temperature of the vehicle and the tester are similar.
- Disconnect the purge tube at the quick connector on the evaporative emission canister side of the Q12 evaporative emission canister purge solenoid valve and install the CH 48096: Port Tool.
- Connect the EN 41413-A: EEST to the CH 48096: Port Tool.
- Using a scan tool close the evaporative emission canister vent solenoid valve to seal the evaporative emission system.
- Use the flow meter on the EN 41413-A:
EEST, calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the evaporative emission system.
- If a leak is detected, use the EN 41413-A: EEST to apply smoke to the evaporative emission system at the purge tube until the leak is located using the EN 41413-SPT: White Light.
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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.