DTM 1 - Self-test: Notes
The microprocessor in the dashboard can store up to 7 different kinds of fault.
The control module has a memory for DTCs. This memory retains the DTCs even if the battery is disconnected for any length of time.
Use this DTM to find out if some input signals to the dashboard are missing or if the speed data signal leads are faulty. Speed data is something the dashboard sends to a large number of other systems, such as the trip computer, cruise control, fuel and ignition system and automatic gearbox.