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.
Diagnostic Procedures
2001 Chevrolet Cavalier LS, 2.4 TSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
- Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
- Using scan tool, clear DTCs. Idle engine at the normal operating temperature. Monitor the misfire current counters with a scan tool. Are any of the misfire current counters incrementing? If yes, go to step 4 . If no, go to next step.
- Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC or as close as possible to the Freeze Frame/Failure Records that you observed. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
- Turn ignition off. Disconnect the appropriate harness connector of the fuel injector. Turn ignition on, with engine off. Probe ignition 1 voltage circuit of the fuel injector with a test light that is connected to a good ground. Command the fuel pump ON with a scan tool. Does test light illuminate when fuel pump is commanded ON? If yes, go to next step. If no, go to step 11 .
- Connect the J-34730-405 Injector Test light between the control circuit and ignition 1 voltage supply circuit of the fuel injector harness connector. Start engine. Does the test light flash? If yes, go to step 9 . If no, go to next step.
- Does the test light remain illuminated at all times? If yes, go to step 8 . If no, go to next step.
- Test the control circuit of the fuel injector for a short to voltage and for an open. Did you find and correct the condition? If yes, go to step 14 . If no, go to step 10 .
- Test the control circuit of the fuel injector for a short to ground. Did you find and correct the condition? If yes, go to step 14 . If no, go to step 13 .
- Inspect for poor connections at the harness connector of the fuel injector. Did you find and correct the condition? If yes, go to step 14 . If no, go to step 12 .
- Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step 14 . If no, go to step 13 .
- Repair the ignition 1 voltage circuit of the fuel injector for an open or a short to ground. After repairs, go to step 14 .
- Replace the fuel injector. Did you complete the replacement? If yes, go to step 14 .
- Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After replacing PCM, go to next step.
- Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . If yes, go to next step. If no, go to step 2 .
- Using scan tool, observe the stored information and Capture Info. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, 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.