volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

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Checking clutch pedal switch F36 > < Checking coolant temperature sender G62

Polo Mk3

Checking brake light switchF and brake pedal switchF47
Checking brake light switch -F- and brake pedal switch -F47-
Because the injection system operates with an accelerator pedal sender (potentiometer) which may be defective, the engine is regulated for reasons of safety when the brakes are operated. To do this the control unit requires signals from the brake light switch and also the brake pedal switch. This means that if the brakes are operated when the accelerator pedal is held at a constant position the engine is immediately reduced to idling speed. Incorrectly adjusted switches may lead to unrequired regulating action
Special tools and workshop equipment required
t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with diagnosis cable -V.A.G 1551/3-
t  Hand multimeter -V.A.G 1526C- or multimeter -V.A.G 1715-
t  Auxiliary measuring set -V.A.G 1594C-
t  Current flow diagram
Check switching points for brake light switch -F- and brake pedal switch -F47-
Test procedure
–  Connect fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- and select engine electronics control unit with “address word 01”. The ignition must be switched on for this purpose. (Connect fault reader -V.A.G 1551- and select engine electronics control unit → Chapter.)
   
Indicated on display:
–  Press buttons 0 and 8 for function “Read measured value block” and confirm entry with Q button.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press buttons 0, 0 and 6 for “Display group number 6” and confirm entry with Q button.
–  Observe display in display zone 2.
  
Read measured value block           HELP
Input display group number XXX
Specification: 0 0 0
–  Slowly apply brake.
  
Read measured value block 6          ->
0 km/h      0 0 0      000000       255
Specification: 0 1 1 Both displays must change from 0 to 1 at same time.
If one or both displays do not change:
–  Check switches or line connections to the switches: → Current flow diagrams, Electrical fault finding and Fitting locations
  
Read measured value block 6           ->
0 km/h      0 1 1       000000       255

Checking clutch pedal switch F36 > < Checking coolant temperature sender G62