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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 45 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.1L ENGINE)DIAGNOSTIC TESTSDTC P0442: EVAP SYSTEM - LEAK DETECTEDDIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F

Diagnostic Procedures

2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Does the scan tool indicate DTCs P0443, P0449, P0452, or P0453 are also set? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Inspect the Evaporative Emission (EVAP) system for the following conditions: A loose, missing, or damaged service port Schrader valve, a loose, incorrect, missing or damaged fuel fill cap, or damaged EVAP canister purge valve. Raise vehicle on a hoist. Inspect EVAP system for disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses, a damaged EVAP canister vent valve or EVAP canister. Did you find and correct the condition? If yes, go to step  5. If no, go to next step.
  4. With a scan tool, capture and record the Fail Record data and clear the DTCs. Perform the Service Bay Test. Does the scan tool indicate that the Service Bay Test passed? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
    NOTE: Always zero the EVAP pressure and vacuum (in H2O) gauges on EVAP Pressure and Purge Station before proceeding with diagnosis.
  5. Install the J-41415-40 Fuel Fill Cap Adaptor. Connect the J-41413 EVAP Pressure and Purge Station and the vehicle fuel fill cap to the J-41415-40. Turn ignition on, with engine off. Seal the EVAP system with the scan tool. Continuously pressurize the EVAP system to 15 in. H2O with the J-41413 (fuel tank may need to be partially lowered to inspect components located in upper portion of tank). Inspect for leaks in the Ultrasonic Leak Detector, the EVAP system purge pipe, vapor pipe, vent hose, fuel fill pipe/hose and fuel fill cap. Check for leaks in the fuel sender assembly and/or seal, FTP sensor seal, fill limiter vent valve, pressure relief valve, rollover valves, permanent EVAP pipes and/or fuel tank. Did you find and correct the condition? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  6. With a scan tool, capture and record the Fail Record data and clear the DTCs. Perform the Service Bay Test. Does the scan tool indicate that the Service Bay Test passed? If yes, go to next step. If no, repeat step  5.
  7. Using scan tool, observe stored information and Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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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.