Programming the Speedometer

Programming The Speedometer

The ABS or TC/ABS control module reads 29 pulses per wheel revolution. Depending on the dimensions of the tyre and rim (physical circumference), one kilometre will correspond to a different number of pulses when the main instrument unit receives the value from ABS or TC/ABS. It is therefore possible to change how the main instrument unit interprets the total number of pulses per kilometre so they correspond to the tyre dimension fitted on the car. Programming must be carried out so that the speedometer and odometer can give the driver the correct information. On certain markets, it is a legal requirement that the speed the speedometer shows is between 0 and 10 km/h too high.


NOTE: If the speedometer is not programmed correctly, the speed that is displayed to the driver may be lower than the actual speed and SID will provide incorrect information on the fuel quantity and time of arrival.












The current tyre size is programmed using Tech 2. There are three alternative tyre types from which to choose. Tyre type 1 has the largest circumference and tyre type 3 the smallest.

If the speedometer is programmed for a certain type of tyre and new wheels with larger circumference are fitted, the speed displayed by the speedometer will be too low.


NOTE: The car must be approved for fitting 17 inch wheels.


Tyre types in Tech 2:
- Type 1
205/65 R15
- Type 2
215/55 R16
- Type 3
225/45 R17