5 - Checking the Traffic Load on the CAN Cables

Checking The Traffic Load On The CAN Cables







- Connect the battery
- Ignition on.
Also read: Note when disconnecting/connecting the battery lead

Faults in the CAN network may be due to a control module sending faulty messages that disrupt "normal" communication. When messages are sent incorrectly, this results in a considerable increase in the amount of traffic on the CAN network. Check the load by measuring the average voltage value on the CAN cables in relation to ground.

Connect a voltmeter between CAN-L and ground.
The voltage must be approximately 2.3 V.
Then connect a voltmeter between CAN-H and ground. The voltage must be approximately 2.8 V.

HINT: If possible measure from the rear of the affected connectors so that they are not damaged.

Is the value OK?

YES: Continue with Test (Downloading New Software). 8 - Downloading New Software
NO: Identifying a control module in the CAN network. 6 - Identifying A Control Module In the CAN Network