Speed pulse output error
* Check whether the attached device actively monitors the line and deactivate if necessary. * Check output "B7" on the tachograph. * Check the cable between the tachograph and the attached control device (Coordinator COO): - Short circuit after ground? - Short circuit after +UBAT? * Check the connected control device (Coordinator COO). * Replace defective components.
What you'll see
No driver-visible symptom recorded.
System reaction
* Message with error text: "Internal fault" together with Memory Code 10 is shown in the tachograph display. * Event is not stored in the tachograph memory.
Diagnostic depth
Speed impulse output error (B7).
* The cable between the tachograph and the attached control device (Coordinator COO) is defective. * Attached control device (Coordinator COO) at output "B7" is defective. * Output "B7" on the tachograph is defective..