Voltage supply
â–¶ How to fix
Check the circuit for shorts and breaks. If it becomes evident that the fault is internal, the tachograph must be renewed.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The voltage supply to the tachograph has been too high.
Possible cause
Short circuit or open circuit in the tachograph power supply. There may also be an internal fault in the tachograph.