Electronic Pinion Factor

ELECTRONIC PINION FACTOR (IF APPLICABLE)
The transmission output speed signal supplies distance pulses to the control module, which are used to calculate speed and mileage. A pinion factor is stored in the control module in order to provide the appropriate distance pulses for other vehicle systems. The pinion factor is programmed into the control module at the assembly plant.

Using the following steps, the pinion factor can be checked and/or reset using the DRBIII:
1. Select Transmission system, then Miscellaneous functions, then Pinion Factor. The DRBIII will display the current tire size.
2. If the tire size is incorrect, press the Enter key and then select the correct size.
3. Press the Page Back key to exit the reset procedure.

Notes About Electronic Pinion Factor Features
The nature of the electronic pinion factor requires that certain features must be taken into consideration.
^ If no pinion factor is stored in an installed control module, the vehicle speedometer will not operate, engine speed will be limited to 2300 RPM, and catalyst damage may occur.
^ Selecting a wrong tire size will cause the speedometer to be inaccurate and will also cause any speed related features to operate improperly.

Note: After replacing the PCM (NGC) or TCM (EATX), you must reprogram pinion factor

ELECTRONIC PINION FACTOR WARNINGS (IF APPLICABLE)
The pinion factor must be set when replacing the control module. Note: The pinion factor is a fixed number and cannot be changed or updated in some vehicle applications. If the pinion factor is not set or incorrectly set, any speed related functions will not operate correctly i.e. speedometer, speed control, rolling door locks, other control modules will be affected that depend on speed information.