Description

Vehicle speed via CAN faulty.

Effects on the driving operation

Hard shifts

Possible causes

An incorrect value for the vehicle speed was received on the CAN bus.

Using the SAE J1939 CAN protocol:

CAN message 'Cruise Control/Vehicle Speed (CCVS)': Signal "Wheel based vehicle speed" possibly faulty.

Place of action

No description available.

Instruction

Check cable / plug connections

Check external control unit

Using the SAE J1939 CAN protocol:

CAN message 'Cruise Control/Vehicle Speed (CCVS)': Check "Wheel based vehicle speed" signal.

Setting conditions of the event

No description available.

Test conditions of the event

No description available.

Final function check

If the defective component cannot be clearly identified, you should try to reproduce the fault:

• Reinstall the component in the vehicle.
• Test the function.

After the fault has been eliminated, the following steps have to be carried out:

• Conduct a test drive with function check.
• Read out the fault memory.
• Check the transmission for leaks.
• Perform a final visual inspection.

These steps are necessary to ensure the entire vehicle functions.

See also:

		Aftersales service index