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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 8.1L)INSPECTION/MAINTENANCE PROCEDURESINSPECTION/MAINTENANCE EVAPORATIVE EMISSION SYSTEM SET PROCEDUREDIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Diagnostic Procedures

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
  1. Perform inspection/maintenance system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing inspection/maintenance system check, go to next step.
  2. Using a scan tool, select SPECIAL FUNCTIONS. Determine if vehicle is equipped with a service bay test for EVAP system. If vehicle is equipped with EVAP service bay test, go to next step. If vehicle is not equipped with EVAP service bay test, go to step  5.
  3. Ensure vehicle meets the specific conditions before performing procedure. See CONDITIONS FOR RUNNING . Turn off all accessories (e.g., A/C, blower fan, etc.). Using scan tool, perform EVAP Service Bay Test. If EVAP system passes service bay test, go to step  8. If EVAP system does not pass service bay test, go to next step.
  4. Observe scan tool service bay test for indication of why the test did not pass (e.g., failed DTC, test aborted, etc.). Repair as necessary. After repairs, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE .
    5. WARNING: Road test vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
  5. Ensure vehicle meets the specific conditions before performing procedure. See CONDITIONS FOR RUNNING . Turn off all accessories (e.g., A/C, blower fan, etc.). Start engine and allow to idle for 2 minutes. Accelerate vehicle at part throttle to 45 MPH and maintain speed until operating temperature is reached. Maintain this speed for an additional 3 minutes or until I/M System Status indicator updates to YES. Using scan tool, review I/M SYSTEM STATUS display. If status updates to YES, go to step  8. If status does not update to YES, go to next step.
  6. Using scan tool, observe DTC INFO. If scan tool indicates any failed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, go to next step.
  7. Using scan tool, observe the NOT RAN SINCE CODE CLEARED display to determine if DTCs P0440, P0442, P0446 and P1441 have run. Determine which of the DTCs required for a YES status that have not run. Enter DTC in SPECIFIC DTC menu on scan tool. Operate vehicle within conditions under CODE ENABLE CRITERIA for the specific DTC to run. Repeat procedure until scan tool indicates that diagnostic test has run. Repeat this step for any additional required DTCs that have not run. Using scan tool, observe I/M SYSTEM STATUS display. If EVAP system status updates to YES, go next step. If EVAP system status does not update to YES, see DIAGNOSTIC AIDS .
  8. Using scan tool, observe the emission related DTC portion of I/M System Status display. If scan tool indicates any emission related DTCs set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no emission related DTCs are set, 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.