Description

Brake pedal permanently applied

Effects on the driving operation

Functions which are triggered by a certain brake pedal position are not available, e.g.:

* No ANS.

* No gear release (no drive mode).

* No retarder activation if it is requested via the brake pedal position.

Possible causes

The brake pedal position received via CAN has never shown a released brake pedal 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 leads to a too great brake pedal position.

* The sending control unit delivers a too great brake pedal position.

Place of action

No description available.

Instruction

Setting conditions of the event

No description available.

Test conditions of the event

No description available.

Troubleshooting

Check whether the brake switch provides a pedal position '0'.

Check the CAN message and contact the manufacturer of the sending unit if necessary (with SAE J1939 see EBC1 (Electronic Brake Controller #1), 'brake pedal position' ).

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