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 MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LINSPECTION/MAINTENANCE PROCEDURESINSPECTION/MAINTENANCE SYSTEM CHECK (CNG)DIAGNOSTIC PROCEDURE
2001 Chevrolet Cavalier LS, 2.4 T
Diagnostic Procedure
2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedure
CAUTION:
Many DTC related repairs will instruct technician to clear DTC information. This procedure will reset ALL I/M System Status indicators to NO and require performing I/M Complete System Set Procedure.
- Perform powertrain diagnostic system check for alternative fuel engine controls. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK (CNG) under SELF-DIAGNOSTIC SYSTEM. Repair any DTCs or driveability concerns that may prevent I/M System Status tests from completing. If DTCs or driveability concerns are found and repaired, go to step 3 . If no DTCs or driveability concerns are found and repaired, go to next step.
- Check Technical Service Bulletins (TSB) for software updates that may prevent I/M readiness. Perform any reprogramming or repairs indicated by service bulletins. Go to next step.
- Using scan tool, monitor I/M System Status display for gasoline control module (PCM). If any tests indicate NO, go to next step. If no tests indicate NO, go to step 6 .
- Turn ignition off. Remove CNG fuse (20-amp) from underhood fuse block. Start engine and allow to idle. Using scan tool, verify engine is operating in gasoline mode. Perform necessary set procedures for I/M System Status indicators that were set to NO. Go to next step.
- Turn ignition off. Reinstall CNG fuse. Start engine and allow it idle. Using scan tool, verify engine is operating in CNG mode. Perform necessary set procedures for I/M System Status indicators that were set to NO. After performing set procedures, system is okay.
- Start engine and allow to idle. Using scan tool, verify engine is operating in CNG mode. Perform necessary set procedures for I/M System Status indicators that were set to NO. After performing set procedures, 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.