Electrical error on CAN bus 5 (CAN5 BusOff)
• Measure the resistance (with the battery disconnected) between CAN-high (pin B6) and CAN-low (pin B15). It should be close to 60 ohm (one 120 ohm termination resistor in each end of the CAN-bus). • Measure the resistance (with the battery disconnected) between CAN-high (pin B6) and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-high (pin B6) and ground. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low (pin B15) and supply. It should be high ohmic (Mega ohm). • Measure the resistance (with the battery disconnected) between CAN-low (pin B15) 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 CAN bus 5 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 5: - 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 5. • ECU on CAN-bus communicates with 500 kbps. • These causes might not be detectable by the CAN controller. Instead timouts will occur for involved ECUs.