seat Workshop Repair Guides

SEAT Workshop Service and Repair Manuals

ABOUT US
Motronic injection and ignition system (1.4 l engine, 2 valves) > < Knock sensor checking

Leon Mk2

Misfiring recognition checking
Misfiring recognition checking
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-
Test sequence
–  Connect fault reader -V.A.G 1551/V.A.G 1552-. Start engine and select “Address word” 01 of engine control unit. (Fault reader: Connecting and selecting the engine control unit → Chapter).
   
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, 1 and 4 for “Display group number 14” and confirm entry with Q -key.
  
Read measured value block           HELP
Input display group number           XXX
Indicated on display (1...4 = Display fields)
–  Check the status of fault finding in display field 4.
   Specification: “activated”
–  Check misfiring recognition in display field 3:
   Specification: 0
If the specifications are obtained:
–  Press → -key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q -key.
–  Switch off ignition.
If the specifications are not attained:
–  Change to display group 15 as follows:
   -V.A.G 1551-: Press key 3.
   -V.A.G 1552-: Press key ↑.
  
Read measured value block 14          ->
         1         2         3         4
Indicated on display: (1...4 = Display fields)
–  Check the status of ignition fault finding in display field 4.
   Specification: “activated”
–  Check misfiring recognition cyl. 1...cyl. 3 in display fields 1 and 3.
   Specification: 0
If the specifications are not attained:
–  Press → -key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q -key.
–  Switch off ignition.
–  Evaluating display group 15 and display field 16 → .
If the specifications are obtained:
–  Change to display group 16 as follows
   -V.A.G 1551-: Press key 3.
   -V.A.G 1552-: Press key ↑.
  
Read measured value block 15          ->
         1         2         3         4
Indicated on display: (1...4 = Display fields)
–  Check the status of ignition fault finding in display field 4.
   Specification: “activated”
–  Check misfiring in display field 1, cyl. 4.
   Specification: 0
–  Press → -key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q -key.
–  Switch off ignition.
If the specifications are not attained:
–  Evaluating display group 15 and display field 16 → .
  
Read measured value block 16          ->
         1                             4

Motronic injection and ignition system (1.4 l engine, 2 valves) > < Knock sensor checking