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Speed signal checking > < Signals from brake light switch and brake pedal switch checking

Leon Mk1

Signal from clutch pedal switch checking
Signal from clutch pedal switch 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-
t  Test box -V.A.G 1598/31-
t  Hand multimeter -V.A.G 1526 A- or multimeter -V.A.G 1715-
t  Adapter set -V.A.G 1594 C-
t  Current flow diagram
Test conditions
l  Fuse no. 15, OK.
Test sequence
–  Connect fault reader -V.A.G 1551/V.A.G 1552-. Then switch ignition on and select engine control unit with the “Address code” 01. (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, 6 and 6 for “Display group number 66” and confirm entry with Q -key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on display: (1...4 = Display fields)
–  Observe display in display field 2:
(2nd digit from the left)
   Specification: 0 0 0 0
–  Depress clutch pedal fully and observe values in display field 2:
   Specification: 0 1 0 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:
–  Remove lining from under steering column → General Body Repairs, Interior; Rep. Gr.68.
  
Read measured value block          66 ->
       1         2         3         4
–  Pull 2-pin connector off clutch pedal switch.
–  To measure resistance connect the multimeter between switch contacts 1 and 2.
   Specification: approx. 0,0 Ω
–  Depress the clutch pedal.
   Specification: approx. ∞ Ω (no continuity)
If the specification is not obtained:
–  Renew clutch pedal switch.
If the specification is obtained:
  A24-0208
–  Connect multimeter to measure voltage between contact 1 and earth.
–  Switch on ignition.
   Specification: min. 11.5 V
–  Switch off ignition.
If the specification is obtained:
–  Check wiring between 2-pin connector contact 1 and junction box referring to current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations.
If the specification is not obtained:
  E24-0042
–  Connect test box -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.
  N24-0943
–  Check wiring between test box and 2-pin connector (to control unit) for open circuit according to current flow diagram:
   current: Contact 2 +socket 39
   Wire resistance: max. 1.5 Ω
–  Additionally check wires all for short to one another.
   Specification ∞ Ω
–  Additionally check the wiring for short to battery positive or earth.
  E24-0043

Speed signal checking > < Signals from brake light switch and brake pedal switch checking