Calibration interface
â–¶ How to fix
Check the tachograph tamper proof seal.If the fault message is shown repeatedly, renew the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Invalid signals in the calibration interface.
Possible cause
The interface is blocked and additional signals will be ignored until the PIN code is entered (when the workshop card is inserted).