Sensor power supply interruption
* Check the power supply to the motion sensor: - Read the motion sensor voltage on: RDI 0xFD00 byte 2, bit 4. Expected response: 0x01 (On). * Check the motion sensor power supply levels: - Power supply of the motion sensor shall be within range: 6,5 … 9,0 V. * Check the wiring and the connectors to the motion sensor, and the tachograph: - Damaged wiring or connector? - Loose connector? - Poor connection? * Check the motion sensor pin assignment: - Pin 1: power supply (+). - Pin 2: ground (-). * Check the tachograph pin assignment: - Pin B3 (real-time pulse input). - Check for evidence of tampering. * Replace defective components.
What you'll see
No driver-visible symptom recorded.
System reaction
MC19/EV203: * Event warning message with error text: "power interruption" together with Memory Code 19 is shown in the tachograph display. * The warning message will be displayed repetitively every hour until the cause is withdrawn. * Event stored in the tachograph memory * Event stored and in the inserted tachograph card. * System event in TCO1 CAN message is set to active. * Tachograph warning (amber T) is displayed in the instrument cluster.
Diagnostic depth
The motion sensor has detected a power interruption: • Lost power supply (+). • Lost ground (-). • Power supply outside valid range. The DTC is set when the motion sensor power supply is re-established.
* Fault in the tachograph cable harness * Fault in the motion sensor cable harness