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Fuel preparation system Diesel injection > < Check conditions

Leon Mk2

Checking process
Checking process
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-) and select engine electronics control unit with the “Address code” 01. The ignition must be switched on:
   
Indicated on display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 0 and 2 for “Display group number 2” and confirm entry with Q key.
  
Read measured value block               
Input display group number XXX
– 
–  Check the indication of the accelerator pedal position in field 2, without pedal being pressed. Specification: 0,0 %
–  Also check the idling switch indicator in field 3. The central digit should be 1. Display: 0 1 0
  
Read measured value block             2→
0/min      0.0 %      0 1 0      18.4 °C
– 
–  Slowly press the accelerator pedal to its limit, observing fields 2 and 3.
t  Display field 2: The value of the accelerator pedal position should rise continously. Value of accelerator in full throttle position: 100,0 %
t  Display field 3: The central digit should change to 0. Display: 0 0 0
–  Press → key.
–  Press keys 0 and 6 for the “End data transfer” function and confirm input with the Q key.
–  Switch off ignition.
If the specification is not obtained:
–  Remove cover in footwell (driver's side).
–  Replace the accelerator pedal position sender -G79- → Item.
If the indication does not vary or only varies irregularly:
–  Check accelerator pedal position sender wiring as follows:
  
Read measured value block             2→
0/min     100.0 %     0 0 0      18.4 °C
–  Connect test box -V.A.G 1598/31- to control unit wiring harness without connecting the engine control unit.
–  Remove cover in footwell (driver's side).
–  Disconnect 6-pin connector for accelerator pedal position sender.
  E23-0084
–  Check wiring between test box socket and connector for open circuit for breaks, using current flow diagram: Contact 2+socket 12 Contact 3+socket 50 Contact 4+socket 69 Contact 5+socket 70 Contact 6+ socket 51 Wire resistance: 1,5 Ω Max.
–  Additionally check wires for shorts to one another, to vehicle earth or to battery positive. Specification: ∞ Ω
If no wiring fault is detected:
–  Replace the accelerator pedal position sender -G79- → Item.
If the specifications are still not attained:
–  Replace the injection system and diesel pre-heating control unit → Rep. Gr.23
  M20-0016

Fuel preparation system Diesel injection > < Check conditions