Electrical error on CAN-bus 4 (CAN4 BusOff)
شرح
The DTC is set to active if CAN controller of CAN bus 4 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
علت
• Defect wiring of CAN-bus 4: - 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 CAN bus 4. • ECU on CAN-bus 4 communicates with 250 kb/s. • These causes might not be detectable by the CAN controller. Instead timouts will occur for involved ECUs.
نکات
• Warnings may be active in the instrument cluster (dependent on vehicle configuration). • Functions dependent on information from CAN bus 4 are degraded.
k cabling • Check connectors for all ECU:s on the indicated bus. Check for verdigris, broken, unconnected or shorted pins.
