Description

Fault during the plausibility check in the transmission control unit.

The CAN signals ´Requested Gear´ and ´Requested Range´ from the CAN message TC1 are contradictory.

With DIWA.5, ´Requested Gear´ serves to read the information on the driving direction; ´Requested Range´ is used to determine the allowed gear range.

Effects on the driving operation

Driving is not possible.

The transmission shifts to neutral.

The optional limp-home switch allows continuing the drive.

Possible causes

Defect of the Voith CAN gear range selector or defect of the MAN-FFR (vehicle control computer) for systems without Voith CAN gear range selector.

The message TC1 is affected.

In MAN vehicles: The FFR temporarily sends forward and reverse information simultaneously. The fault is located in the FFR software. (Version 2005)

Place of action

No description available.

Instruction

Replace gear range selector.

In vehicles with MAN-FFR (vehicle control computer), contact the manufacturer and replace the FFR or the gear range selector connected to it.

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