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 G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 8.1L)INSPECTION/MAINTENANCE PROCEDURESINSPECTION/MAINTENANCE SYSTEM CHECKDIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Diagnostic Procedures
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
- Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
- Review any service bulletins for software updates that may prevent I/M readiness. Perform any reprogramming or repairs indicated by the service bulletins. If reprogramming or repair service was required, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE . If reprogramming or repair service was not required, go next step.
- Using scan tool, observe the I/M SYSTEM STATUS display. If more than one test is indicating a NO status, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE . If only one test is indicating a NO status, perform appropriate I/M system set procedure for the indicated system. See INSPECTION/MAINTENANCE SYSTEM SET PROCEDURE INDEX table.
INSPECTION/MAINTENANCE SYSTEM SET PROCEDURE INDEX
| System With NO Status | Perform |
|---|---|
| AIR System | INSPECTION/MAINTENANCE AIR SYSTEM SET PROCEDURE |
| Catalyst System | INSPECTION/MAINTENANCE CATALYST SYSTEM SET PROCEDURE |
| EGR System | INSPECTION/MAINTENANCE EXHAUST GAS RECIRCULATION SYSTEM SET PROCEDURE |
| EVAP System | INSPECTION/MAINTENANCE EVAPORATIVE EMISSION SYSTEM SET PROCEDURE |
| HO2S/O2S System | INSPECTION/MAINTENANCE HEATED OXYGEN SENSOR SYSTEM SET PROCEDURE |
| HO2S Heater System | INSPECTION/MAINTENANCE HEATED OXYGEN SENSOR HEATER SYSTEM SET PROCEDURE |
RENDER: 1.0x
NO RELATED
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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.