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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2 (COMPUTER RELEARN PROCEDURES)RELEARN PROCEDURESCOMPUTER RELEARN PROCEDURESPINION FACTOR PROCEDURE
1999 Jeep Wrangler SE, Automatic
Pinion Factor Procedure
1999 Jeep Wrangler SE, AutomaticSECTION Pinion Factor Procedure
WARNING: This page does not describe the selected car, but rather 25 other vehicles, including the 1997 Plymouth Voyager, 1997 Plymouth Neon, 1997 Plymouth Grand Voyager, 1997 Plymouth Breeze, and 1997 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
- Pinion factor procedure must be performed to provide proper speedometer operation if Transmission Control Module (TCM) is replaced. If pinion factor procedure is not performed, speedometer may not operate. Pinion factor procedure must be performed using Chrysler's Diagnostic Readout Box (DRB-III) scan tool.
- Connect scan tool to 16-pin data link connector, located below driver's side of instrument panel. Install cartridge in scan tool.
- Red and Green lights on scan tool will light up and then begin to flash. Wait until both lights stop flashing. Press No. 4 button (SELECT SYSTEM) on scan tool keypad. Press No. 2 button (TRANSMISSION) on scan tool keypad.
- Press No. 1 button on scan tool keypad. Wait for scan tool to perform the Bus Test, Initialize Test and Transmission Control Module Part Number Test before continuing.
- Press No. 5 button (ADJUSTMENTS) on scan tool keypad. Press No. 2 button (PINION FACTOR) on scan tool keypad. Follow instructions displayed on scan tool. When pinion factor procedure is complete, remove scan tool.
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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.