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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 248 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DRIVE CYCLESINSPECTION/MAINTENANCE HEATED OXYGEN SENSOR/OXYGEN SENSOR SYSTEM SET PROCEDUREDIAGNOSTIC 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 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Inspection/Maintenance (I/M) system Check? If yes, go to next step. If no, go to INSPECTION/MAINTENANCE SYSTEM CHECK .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.
- Ensure the vehicle is operating within the Conditions for Running. Turn OFF all of the accessories (e.g., A/C, blower fan, etc.). Start and idle engine. Accelerate vehicle to 45-55 MPH and operate vehicle within the specified speed for 6 minutes or until the I/M system Status updates to YES. On M/T, either 5 or 6-speed, may require operation in 4th or 5th gear respectively, in order for this test to run. With a scan tool, review the I/M system Status display. Did the HO2S/O2S system Status update to YES? If yes, go to step 5. If no, go to next step.
- Using scan tool, observe DTC Information. Does the scan tool indicate any failed DTCs? If yes, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
- Refer to the Inspection/Maintenance (I/M) System DTC Table to determine which DTCs are required to run in order to complete this test. See INSPECTION/MAINTENANCE SYSTEM DTCS under INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE. Using scan tool, observe the Not Ran Since Code Cleared display. Determine which of the DTCs required for a YES status has not run. Operate vehicle within Conditions For Running DTC. Monitor status of DTCs that are necessary to complete the test in the Not Ran Since Code Cleared display of scan tool. Repeat this procedure until scan tool indicates the diagnostic test has run. Repeat this procedure for any additional required DTCs that have not run. Using scan tool, observe I/M system Status display. Did the HO2S/O2S system Status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
- Using scan tool, observe the emission related DTC portion of the I/M system Status display. Does the scan tool indicate any Emission Related DTCs set? If yes, diagnose affected DTCs. See 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.