Attention: Each control unit is programmed with certain basic values. which correspond to the mean values of the variables. During operation, the control unit receives, depending on the state and mode of operation of the engine, various input data from the sensor, which are compared with the values available in the memory. Then the control unit changes the commands to the actuators accordingly. New values are stored in memory, i.e. the so-called process «learning».
If the DME control unit has not been energized for more than one hour (the unit has been removed or the battery has been disconnected), then the stored values are erased from the memory of the self-learning system.
When a control unit with an erased memory is switched on again or a new one is installed in the system, the engine input parameters must be re-entered. This process can, after starting the engine, lead to uneven idling and interruptions in engine braking. The car must drive for several minutes at various speeds until all the values characterizing the state of the engine are entered into the memory of the control unit. After installing a new control unit, it must be coded and programmed on the vehicle in a specialized workshop. This requires a diagnostic unit (starter motor). If possible, warm up the engine with the old control unit, and then install the new control unit on the new engine. This will speed up the running-in process.
Withdrawal
Before removing the control unit, it is recommended to interrogate the self-diagnosis unit in a workshop to determine what faults are present.
Disconnect the negative cable from the battery.
Remove the cabin air filter. It is located in the rear right side of the engine compartment. This is necessary to get to the electronic unit.
Loosen the screws and remove the fuse block cover.
Pry up the fastening brackets on the connecting plug, remove the plug.
Pull the control unit out of the mounting brackets. The bracket screws do not need to be loosened.
Attention: On models with automatic transmission, there is a second control unit next to the DME control unit.
Installation
When buying a new block, you need to write down the number of the old block and its encoding. To eliminate errors, you need to take the old block with you.
Insert the control unit, connect the plug. Fasten the staples.
Install covers.
Connect the wire to the battery.
If the control unit has been disconnected from power for more than one hour, or if it is new: Warm up the engine to operating temperature. Take a 10 minute test ride at different speeds. In this case, the control unit will go through the process «learning».