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HOMESERVICE MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN CARGO, 4.3 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - GASOLINE - 4.3L, 5.0L, 5.7L & 7.4LDIAGNOSTIC TESTSDTC P0442: EVAP SYSTEM - SMALL LEAK DETECTEDDIAGNOSTIC PROCEDURES
2000 Chevrolet Chevy Express G3500, Van Cargo, 4.3 W

Diagnostic Procedures

2000 Chevrolet Chevy Express G3500, Van Cargo, 4.3 WSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check if DTC P0446, P0452 or P0453 is set. If any of this DTC is set, diagnose affected DTC. If DTCs are not set, go to next step.
  3. Turn ignition off. Remove fuel cap. Turn ignition on. Using scan tool, read FUEL TANK VACUUM. If scan tool displays zero in. H2O go to next step. If scan tool does not display zero in. H2O, repair faulty fuel tank sensor circuit.
  4. Zero pressure and vacuum gauges on EVAP Pressure/Purge Diagnostic Station (J-41413). Reinstall fuel cap. Read and Record FAILURE RECORDS data for this DTC. Clear DTCs. Using scan tool, command EVAP vent valve on (closed). Connect EVAP Pressure/Purge Diagnostic Station (J-41413) to EVAP service port. Using diagnostic station, pressurize EVAP system to 15 in. H2O. Monitor pressure on diagnostic station gauge. If pressure decreases to less than 10 in. H2O, go to next step. If pressure does not decrease to less than 10 in. H2O, see DIAGNOSTIC AIDS .
  5. Disconnect fuel tank vapor and EVAP purge lines from EVAP canister. Plug fuel tank vapor line fitting at EVAP canister. Connect a hand vacuum pump to EVAP purge line fitting at EVAP canister. Ensure EVAP vent solenoid is still commanded ON (closed). Attempt to apply 5 in. Hg to EVAP canister. If vacuum is maintained as specified, go to step  10. If vacuum cannot be maintained as specified, go to next step.
  6. Leave system connected as in previous step. Disconnect and plug vent hose at vent valve. Using a hand-held vacuum pump, apply 5 in. Hg. If vacuum can be obtained and held, go to step  8. If vacuum cannot be obtained or held, go to next step.
  7. Check vent hose for leak. Repair as necessary. After repairs, go to step  12. If hose is okay, go to step  9.
  8. Replace EVAP vent valve. After replacing vent valve, go to step  12.
  9. Replace EVAP canister. After replacing canister, go to step  12.
  10. Check for missing or faulty fuel cap. Check for disconnected or leaking fuel tank vapor line. Check for disconnected or damaged EVAP purge line. Repair as necessary. After repairs, go to step  12. If no problem is found, go to next step.
  11. Using scan tool, command EVAP vent solenoid on (closed). With EVAP pressure/purge diagnostic station connected to EVAP service port, attempt to pressurize EVAP system to 15 in. H2O by leaving EVAP pressure/purge diagnostic station control knob in PRESSURIZE position. Using Ultrasonic Leak Detector (J-41413), locate and repair EVAP system leak. It may be necessary to lower fuel tank to check connections at top of tank. After repairs, go to next step.
  12. Turn ignition on, engine off. Using scan tool, command EVAP vent solenoid on (closed). Using EVAP pressure/purge diagnostic station, pressurize EVAP system to 15 in. H2O. Monitor diagnostic station pressure gauge. Turn the diagnostic station rotary switch to HOLD position. If pressure decreases to less than 10 in H2O within 2 minutes, repeat step  2. If pressure does not decrease as specified, go to next step.
  13. Using scan tool, select DTC, CLEAR INFO function. Using scan tool, perform SERVICE BAY TEST for EVAP system. After performing test, go to next step.
  14. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, 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.