Contenu
- Speedometer Cable Malfunction
- Change of Tire Size
- Speed Sensor Malfunction
- Programmable Speedometer and Odometer Module
The Ford E350 chassis is used in a number of large vehicles, including vans, motor homes and trucks. Speedometer problems in these vehicles can occur for a number of reasons but are most commonly associated with malfunction of the vehicles speed sensor, trouble with computer controls or data stored in the vehicles computers or loose cables.
Speedometer Cable Malfunction
The speedometer is connected to the speed sensor and the vehicles computer by cables. The speedometer may malfunction of the speedometer cable is knocked loose or if the cable itself malfunctions. Checking for loose connections or replacing the cable may fix speedometer malfunctions.
Change of Tire Size
The Ford E350s internal computer calculates the vehicles speed based on the speed the wheels are rotating and the size of the tires. If the vehicles tires are replaced with tires of a different size, the speedometer must be updated with new tire size information. Otherwise, the vehicles computer will be unable to correctly calculate the vehicles speed.
Speed Sensor Malfunction
The vehicle speed sensor monitors the speed at which the vehicles wheels are spinning and uses that data to calculate the vehicles speed. Malfunction of the speed sensor can cause the speedometer to display incorrect information, to jump around or to fail to move. Malfunction of the VSS can also cause failure or unreliability of other systems, such as anti-lock braking, automatic transmission, cruise control and power steering.
Programmable Speedometer and Odometer Module
The programmable speedometer and odometer module is a computerized instrument cluster that stores the vehicles odometer reading and displayed speed information. The PSOM calculates its information based on data provided by the speed sensor. Malfunction of the PSOM would cause both the speedometer and odometer to cease displaying information.
