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Engine control unit adapting to electronic immobilizer > < Engine control unit coding

Leon Mk2

Engine control unit adapting to throttle valve control part
Engine control unit adapting to throttle valve control part
Via adaptation, with ignition on and engine off, the engine control unit learns throttle valve positions. These positions are stored in the control unit. The two throttle control angle senders confirm the momentary position of the throttle valve.
Adapting sequence must be performed if:
t  After interruption in voltage supply.
t  After removing and fitting throttle valve control part.
t  After replacing throttle valve control part.
t  If when installing another engine another throttle valve control unit is installed.
t  After replacing engine control unit.
Special tools and workshop equipment required
t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3B-
Check conditions
l  No faults must be stored in fault memory → Chapter; Fault memory: consulting.
l  Battery voltage at least 11.5 V.
l  The throttle valve must be at idling speed position.
l  Coolant temperature: between 5...105 °C → display group 04, display field 3.
Work sequence
–  Connect fault reader -V.A.G 1551/V.A.G 1552-. Then switch ignition on and select engine control unit with the “Address code” 01. (Fault reader: Connecting and selecting the engine control unit → Chapter).
   
Indicated on display:
–  Press keys 0 and 4 for the function “Introduction of basic setting” and confirm entry with Q -key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 6 and 0 for “Display group number 60” and confirm entry with Q -key.
  
Basic setting                       HELP
Input display group number XXX
Indicated on display:
After pressing the Q key the throttle valve positioner is switched so that it is not supplied with voltage at start of test.
In this condition the throttle valve is pulled into an emergency running position by a mechanical spring in the throttle valve control part. The values that both angle senders provide in the emergency running position are stored by the engine control unit.
Thereafter the throttle valve is opened a predetermined value. If this value is achieved, voltage to the throttle valve positioner is again cut. Now the mechanical spring must pull the throttle valve to the previously learnt emergency running position. This process should take a definite time (spring test).
Then the throttle valve is closed by the throttle valve positioner and the values, which are supplied by the angle senders in the throttle valve control part are stored by the engine control unit.
If the engine control unit switches the throttle valve positioner so that it is without voltage during normal operation, this is indicated by the increased and hunting idling speed. The engine reacts sluggishly when to accelerating.
  
System in basic setting  60           ->
xx%       xx%           xx       ADO.ON
Indicated on display: (1...4 = Display fields)
Adapting has been performed successfully.
To store the values:
–  Switch off ignition.
  Note!
t  If the basic setting of the control unit is interrupted, the cause could be one of the following:
t  Throttle valve cannot reach the mechanical stop because of contamination e.g: burnt oil deposits, or due to faulty adjustment of accelerator drive cable.
t  Battery voltage too low.
t  Throttle valve control part or wiring is faulty, check → Chapter.
After an interruption a fault is stored in fault memory. When basic setting is automatically performed again.
–  End the engine basic setting by pressing the → -key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q -key.
–  Start engine and allow to run at idling speed for min. 5 minutes to ensue complete value storage.
  
System in basic setting  60           ->
      xx%      xx %      12      ADP. OK

Engine control unit adapting to electronic immobilizer > < Engine control unit coding