CAN bus
Also check the CAN bus connections and connectors.Measure the resistance between coordinator pins 45 and 21. The value should be 60 ohms.Measure the resistance between coordinator pins 45 and 1, between pins 45 and 49, between pins 21 and 1 and between pins 21 and 49. The value should be infinite.Check also whether the engine control unit has generated any fault codes.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
All communication on the CAN bus has been interrupted.
The fault may be due to: Short circuit between CAN High and CAN Low (coordinator pins 45 and 21).Short circuit between CAN High and earth (pins 45 and 1).Short circuit between CAN High and power supply (pins 45 and 49).Short circuit between CAN Low and earth (pins 21 and 1).Short circuit between CAN Low and power supply (pins 21 and 49).Incorrect control unit connected to the CAN bus.