seat Workshop Repair Guides

SEAT Workshop Service and Repair Manuals

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Checking components and functions > < Test conditions

Leon Mk1

Test sequence
Test sequence
  Note!
To check the speed signal the vehicle must be driven. To do this a second person is necessary.
  Caution
Secure fault reader to rear seat and operate from this position.
Observe the valid safety precautions when carrying out a road test → Chapter.
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-) and select engine electronics control unit with the “Address word” 01. When doing this the engine must be running at idling speed. (Connecting fault reader and selecting engine electronics control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
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 6 for “Display group number 6” and confirm entry with Q key.
–  Carry out test drive with a 2nd person to observe display.
  
Read measured value block           HELP
Input display group number XXX
Specification display zone 1: Approx. road speed.
–  Drive slower. The displayed value must decrease.
–  Press the → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
If no speed is indicated or the display values reduce when driving slowly:
–  Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92
  
Read measured value block 6            →
xxx km/h    0    0    0    000000    255
–  Connect test box -V.A.G 1598/22- to control unit wiring harness.
–  Connect diode test lamp between socket 1 (earth) and socket 51 (speed signal).
–  Lift vehicle at front left.
–  Switch on ignition.
–  Turn front wheel and observe the light emitting diode (LED) on the diode test lamp. Light emitting diode must flash (approx. four times per wheel rotation).
When the LED does not flash:
–  Check wiring from engine control unit connector contact 51 to dash panel insert for open/short circuit: → Current flow diagrams, Electrical fault finding and Fitting locations
  N24-0709

Checking components and functions > < Test conditions