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Pinion Factor Procedure

  1. 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.
  2. Connect scan tool to 16-pin data link connector, located below driver's side of instrument panel. Install cartridge in scan tool.
  3. 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.
  4. 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.
  5. 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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