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 MANUALSJEEP1999WRANGLER SE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESVERIFICATION TESTSTEST VER-5AFINAL PROCEDURE
1999 Jeep Wrangler SE, Standard
Final Procedure
1999 Jeep Wrangler SE, StandardSECTION Final Procedure
- Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If any DTCs have not been diagnosed, return to appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table and finish diagnosing remaining DTCs as necessary. If all DTCs have been diagnosed and repaired, go to next step.
- Connect scan tool to Data Link Connector (DLC) if not previously done. Ensure fuel tank is at least 1/4 full. Ensure A/C is off. Go to next step.
- Proper way to ensure DTC is repaired is to allow Powertrain Control Module (PCM) to run monitor. Monitor operation may be observed on scan tool. All specified enabling conditions for specified DTC must be met before PCM will operate monitor. Go to next step.
- Using scan tool, monitor pretest enabling conditions until all conditions have been met. Once all enabling conditions are met, observe appropriate monitor for DTC on scan tool. If repaired DTC has reset or is See n in monitor while on road test, repair is not complete. Check for related Technical Service Bulletins (TSBs) and return to appropriate test listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete. Go to step 6).
- If another DTC exists, return to appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete. Go to next step.
- Turn ignition on, with engine off. Using scan tool, erase DTCs. Turn ignition off. Disconnect scan tool. Test is complete.
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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.