Speedometer Head: Testing and Inspection

NOTE: The pinion factor must be set for all new transmission control modules. If the pinion factor is not set or if it is set incorrectly, any speed-related accessories will not operate or will operate inaccurately. This includes the speedometer, speed control, rolling door locks, and other devices that are operated by the powertrain and body control modules. For instructions on setting the pinion factor, see the appropriate transmission diagnostic procedures or the service procedures.

Diagnosis of the speed sensor and circuit, the Chrysler Collision Detection (CCD) data bus, and/or the Powertrain Control Module (PCM) should be performed with a DRB scan tool.
This vehicle is equipped with an electronically driven speedometer and odometer which has the same appearance as a conventional cable driven unit. The speedometer cable is replaced by a transmission mounted speed sensor. For diagnosis of the speed sensor refer to: Transmission and Drivetrain / Transmission Control Systems / Transmission Speed Sensor.