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Checking clutch pedal switch > < Check conditions

Leon Mk2

Test sequence
Test sequence
  Note!
The brake pedal switch -F47- and brake light switch -F- are together in one housing.
–  Connect the fault reader -V.A.G 1551- (-V.A.G 1552-) and with ignition switched on select engine electronics control unit with the “Address word” 01. (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.
–  Observe display in display zone 2.
  
Read measured value block           HELP
Input display group number XXX
Specification: 0 0 0
–  Operate brake pedal slowly.
  
Read measured value block 6            →
0 km/h      0 0 0       000000       255
Specification: 0 1 1 Both displays must simultaneously change from 0 to 1.
t  Centre display = Brake pedal switch
t  Right-hand display = Brake light switch
–  Release brake pedal slowly into rest position again.
  
Read measured value block 6            →
0 km/h      0 1 1       000000       255
Both displays must change from 1 to 0 again.
If one or both displays do not change:
–  Press the → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
  
Read measured value block 6            →
0 km/h      0 0 0       000000       255
–  Pull 4-pin connector off brake pedal switch -F47- and brake light switch -F--arrow-.
  E23-0011
–  Measure resistance between switch contacts 1+4. Specification Brakes not operated: ∞Ω Brakes operated: max. 1.5 Ω
–  Measure resistance between switch contacts 2+3. Specification Brakes not operated: max.1.5 Ω Brakes operated: ∞Ω
If the specifications are not obtained:
–  Renew brake pedal switch -F47- and brake light switch -F-.
If the specifications are attained:
–  Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92
  E23-0012
–  Connect test box -V.A.G 1598/22- to control unit wiring harness.
  N24-0709
–  Check wiring for open circuit between test box and 4-pin connector according to current flow diagram. Contact 2+ socket 2 Contact 2+ socket 28 Contact 3+ socket 9 Contact 4+ socket 20 Wire resistance: max. 1.5 Ω
–  Additionally check wires for short to one another, to vehicle earth and to battery positive. Specification: ∞Ω
If no wiring fault is detected:
–  Renew engine control unit → Chapter.
  E23-0013

Checking clutch pedal switch > < Check conditions