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Fendt 900 Vario COM III A051 ECU Engine Flash

The settings (engine power, engine cut-off speed,governor behaviour, engine configuration etc.) have
been saved in the engine software (engine data record and operating software).
The engine software is installed on the A051 ECU, engine control unit

WARNING: If the A051 ECU, engine control unit is programmed with engine software that does not match the chassis number, any claims under warranty will be invalid.
The person carrying out the programming is responsible for correctly carrying out the procedure and may be held liable if it is carried out incorrectly.

The chassis number and engine number of the tractor are stored in the A051 ECU, engine control unit, as is the Serdia adapter serial number.


If engine software that does not match the chassis number of the tractor is programmed, the tractor's immobiliser is activated. (i.e. the A051 ECU, engine control unit does not release an injection volume).
If an A051 ECU, engine control unit that does not match the tractor's chassis number is installed, the tractor's immobiliser is activated (i.e. the A051 ECU, engine control unit does not release an injection volume).

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If a new A051 ECU, engine control unit is installed, it must be programmed with the engine software that matches the tractor.
The A051 ECU, engine control unit must then be taught to recognise the immobiliser.
Only new components that have not yet been activated can be taught in.

The following conditions must be met in order to be able to replace the engine software or load it for the first time in an A051 ECU, engine control unit:

The programming procedure for the Deutz diagnosis program is protected by a password
The most recent Deutz diagnostics program (SERDIA) must have been installed on the diagnostic computer (laptop).
The engine software must be available
Load the engine software onto the A051 ECU, engine control unit.
Determine the SERDIA password
Read off the serial number (arrow) on the Serdia adapter.


Example: SN:131467
Request the SERDIA password from FENDT Customer Service
Connect the SERDIA adapter (level 3) to the X810 diagnostics socket
NOTE: When programming, make sure that the laptop is connected to the mains power supply (220 V)
or that there is sufficient power remaining in the laptop battery.
If the laptop suffers a power failure during programming,the A051 ECU, engine control unit will crash!
NOTE: The USB cable to the laptop should be no longer than 2 m.
If the cable is longer than 2 m, this may cause interference when programming.
This interference may cause the A051 ECU, engine control unit to crash.

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