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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS SELF-DIAGNOSTICS - 5.0L & 5.7LINSPECTION/MAINTENANCE PROCEDURESINSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDUREPROCEDURE
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Inspection/Maintenance Complete System Set Procedure: Procedure

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Procedure
  1. Perform INSPECTION/MAINTENANCE SYSTEM CHECK . After performing inspection/maintenance system check, go to next step.
    2. NOTE: Whenever ignition is on, ignition voltage is supplied to HO2S heaters. After verifying enable criteria, turn ignition off for approximately 5 minutes to allow sensors to cool before continuing with test. Once engine is started, DO NOT turn engine off for remaining portion of procedure.
  2. Preprogram scan tool with vehicle information before ignition is turned on. Ensure vehicle meets conditions under ENABLE CRITERIA . Turn off all accessories, such as A/C, blower fan, etc. Set vehicle parking brake. Ensure transmission is in Park. Start engine. Allow engine to idle for 2 minutes. Go to next step.
    3. 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.
  3. Acceleration at part throttle to 55 MPH with this speed maintained until engine reaches operating temperature. This may be up to 8-10 minutes depending on start-up coolant temperature. Continue operation under these conditions for an additional 6 minutes. Go to next step.
  4. Reduce vehicle speed to 45 MPH with this speed maintained for one additional minute. Perform 4 decelerations of 25 seconds each from 45 MPH while the following criteria is maintained:
    • Throttle is closed.
    • No brake application.
    • No manual downshift.
    • Vehicle speed remains more than 25 MPH.
    After each deceleration period, vehicle is returned to 45 MPH under part throttle acceleration and speed is maintained for 15 seconds. When complete, go to next step.
  5. Accelerate at part throttle to 45-55 MPH. Maintain this speed for 2 minutes. Decelerate to zero MPH. Allow engine to idle for 2 minutes while the following criteria is maintained:
    • Service brake depressed.
    • A/T in Drive.
    When complete, go to next step.
  6. Using scan tool, observe I/M System Status display. If all I/M System Status indicators update to YES, go to next step. If all I/M system status indicators do not update to YES, see INSPECTION/MAINTENANCE SET PROCEDURE for indicated systems.
  7. Using scan tool, observe emission related DTC portion of I/M SYSTEM STATUS display. If scan tool indicates any emission related DTCs, see DIAGNOSTIC TROUBLE CODE INDEX  table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. If scan tool does not indicate emission related DTCs, 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.