Output signal
â–¶ How to fix
Check whether there is anything connected to pin B7. If this is the case, find out whether the fault lies here by disconnecting the connection and check whether the fault code is still active.If nothing is connected to B7, there is probably an internal fault in the tachograph and it must be renewed. However, erase the fault code to see whether it recurs before making a decision about renewal.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
An incorrect output signal is detected from pin B7.
Possible cause
Either there is an incorrect connection to pin B7 or there is an internal fault in the tachograph.