Electrical error on CAN-bus 6 (CAN6 BusOff)
• Measure the resistance (with the battery disconnected) between CAN-high (pin B7) and CAN-low (pin B16). It should be close to 60 ohm if CAN bus is connected to other ECU(s) and 120 ohm if not connected or only connected to ECU located close to DAS2. (Normally one 120 ohm termination resistor in each end of a CAN-bus). • Measure the resistance (with the battery disconnected) between CAN-high (pin B7) and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-high (pin B7) and ground. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low (pin B16) and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low (pin B16) and ground. It should be high ohmic (Mega ohm). • Disconnect one ECU unit at a time from the CAN-bus and check if the fault disappears. • Check connector pins • Check cabling • Check connectors for all ECU:s on the indicated bus. Check for verdigris, broken, unconnected or shorted pins.
What you'll see
No driver-visible symptom recorded.
System reaction
• Warnings may be active in the instrument cluster (dependent on vehicle configuration).
Diagnostic depth
The DTC is set to active if CAN controller of the Spare CAN bus is in the state bus-off. The DTC is set to inactive if the CAN-controller is not in state bus-off for 1100 ms. The DTC is not validated (stored) if: • The ignition is turned off • First 2 seconds after ignition on • The supply voltage is below 22 volt • The supply voltage is above 32 volt
• Defect wiring of CAN-bus 6: - CAN-high interrupted - CAN-low interrupted - CAN-high and CAN-low interrupted at the same location - Loss of connection to termination network - Short circuit between CAN-high and CAN low. - Short circuit between CAN-high and supply voltage*. - Short circuit between CAN-high and ground. - Short circuit between CAN-low and supply voltage. - Short circuit between CAN-low and ground*. • Defect ECU on the Spare CAN bus. • ECU on the CAN-bus communicates with 500 kbps.