Description

Braking torque continuously greater than 0

Effects on the driving operation

No retarder activation

Possible causes

The brake torque received via CAN has never been inactive in the current operating cycle although it can be assumed that the vehicle was not permanently braked. Possible causes are:

Defect at the brake switch that permanently causes a valid brake request.

The sending control unit does not deliver a brake torque '0' via CAN.

Place of action

No description available.

Instruction

Check whether the brake switch provides a brake signal '0'.

Check the CAN message and contact the manufacturer of the transmitting control unit if necessary.

(With SAE J1939:

TSC1 (torque/speed controller #1), 'override control mode';

TSC1 (torque/speed controller #1), 'requested torque' / 'torque limit' ).

Setting conditions of the event

No description available.

Test conditions of the event

No description available.

Troubleshooting

Check whether the brake switch can supply the signal identification "0".

The CAN-message for the brake request is set in the dataset:

Brake request via brake pedal position:

• EBC1
• CAN signal brake pedal position

Brake request via braking torque:

• TSC1
• CAN signal override control mode; requested torque

Contact the manufacturer of the sending control unit.

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:

		CAN SAE J1939 Voith specifics (SW E300-D2.3.0.0)
		CAN SAE J1939 Voith specifics (SW E300-D2.4.0.0)
		CAN SAE J1939 Voith specifics (SW E300.1-D5.0.0.0)
		Aftersales service index