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, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESVERIFICATION TESTSTEST VER-1ANOTES

1999 Jeep Wrangler SE, Automatic

Test VER-1A: Notes

1999 Jeep Wrangler SE, AutomaticSECTION Notes

NOTE: If Powertrain Control Module (PCM) is replaced, correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTCs) from being set in Anti-Lock Brake System (ABS) module and Supplemental Restraint System (SRS) module. To program PCM and erase DTCs from ABS and SRS modules, proceed to appropriate procedure listed below. On models equipped with a Smart Key Immobilizer Module (SKIM), if replacing Powertrain Control Module (PCM), secret key data must also be updated to enable engine starting. To update secret key data, proceed to appropriate procedure listed below.

Procedure For Programming PCM & Clearing DTCs From ABS & SRS Modules Connect scan tool to Data Link Connector (DLC). Using scan tool, enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, clear DTCs from ABS and SRS modules. Go to FINAL PROCEDURE.

Procedure For Updating Secret Key Data Connect scan tool to Data Link Connector (DLC). Go to ENGINE and then MISC menus on scan tool. Place SKIM in SECURED ACCESS MODE by using appropriate Personal Identification Number (PIN) for this vehicle. PIN may be obtained from owner, vehicle's invoice, or from manufacturer. Select UPDATE THE SECRET KEY DATA. Data will be transferred from Smart Key Immobilizer Module (SKIM) to PCM. Go to FINAL PROCEDURE.

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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.