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Engine control unit: renew > < Speed signal: check

Leon Mk1

Sequence of operations
Sequence of operations
–  Attach the unit -V.A.G. 1551- (-V.A.G. 1552-). Switch on the ignition and enter “direction code” 01 to select the engine control unit. (Fault finder: Connect and select the engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Display reading:
–  Press the 0 and 4 buttons for the “Begin basic adjustment” function and confirm the entry with the Q button.
  
Rapid data transfer                 HELP
Select function XX
Display reading:
–  Press buttons 0, 9, and 8 for “Display group number 98” and confirm the entry with the Q button.
  
Basic adjustment                    HELP
Enter display group number XXX
Display reading:
After pressing the Q button, the throttle valve actuator moves from min. to max. and five intermediate positions, and the control unit memorises the respective angles in its permanent memory. This process lasts a maximum of 10 seconds. Next, the throttle valve stops briefly in the starting position and then closes.
  
System at basic adjustment 98          →
x,xx V  x,xx V  0000   01
Display reading:
The adaptation of the engine control unit to the throttle control unit has been successfully completed.
  Note!
If one of the messages appears in the display, it means that selfadaptation was not completed with a positive result.
  
System at basic adjustment 98          →
x,xx V  x,xx V  1000   00
  Note!
t  Note relative to display field 3:
t  Meaning of the figures in the 4 digit numerical block for the throttle control unit's operating state:
xxxxMeaning in case of digits = 1
1   Fault during a throttle valve adaptation (consult the fault memory → Vehicle diagnosis, testing and information system VAS 5051)
 1  Throttle control unit, without current (proportion of period = 0)
  1 Adaptation interrupted due to insufficient battery voltage (less than 8 V)
   1Idle switch open (switch consultation)

  Note!
t  Note relative to display field 4:
t  Meaning of the figures in the 2 digit numerical block for the throttle control unit's state of adaptation:
   
Meaning in case of digits = 1
xxState of throttle control unit's adaptation
1 Fault during a throttle valve adaptation (consult the fault memory → Vehicle diagnosis, testing and information system VAS 5051)
 1Adaptation of the throttle control unit, under way

   
Display reading:
  Note!
t  If the control unit interrupts adaptation, it could be due to different reasons:
t  Necessary conditions for adaptation of engine control unit to the throttle control unit are not met; conditions for adaptation ⇒ see fault table, fault code 01087 → Vehicle diagnosis, testing and information system VAS 5051.
t  The throttle valve does not reach the mechanical idle limit because it is dirty (burnt oil residue for example) or because the accelerator control cable is not properly adjusted.
t  Throttle valve control unit or wiring, faulty.
t  After the interruption, “Basic adjustment not carried out, signal not plausible” is recorded in the fault memory.
t  When the ignition is switched on again, the engine control unit will once again try to carry out the adaptation.
–  Finish the basic adjustment of the engine by pressing button →.
–  Press buttons 0 and 6 for the function “End data transmission” and confirm the entry with the Q button.
–  Switch off the ignition.
  Note!
The ignition must remain switched off for at least 15 seconds in order to memorise the basic adjustment.
–  Check the throttle valve's operating state → Chapter.
  
Basic adjustment not carried out        
Signal not plausible

Engine control unit: renew > < Speed signal: check