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Accelerator pedal position sender adjustment > < Electronic accelerator warning lamp checking

Leon Mk2

Accelerator pedal position sen-der checking
   
Accelerator pedal position sen-der 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  manual multimeter -V.A.G 1526A-
t  auxiliary measuring set -V.A.G 1594A- or -V.A.G 1594C-
t  Current flow diagram

Function
Both accelerator pedal position senders -G79- and -G185- on the accelerator pedal pass the driver's requirements on to the engine control unit independently of one another. Both senders are installed together in a single housing.
Check conditions
   
l  Fuses no. 15 and 18, OK
l  Battery voltage at least 11.5 V.
Test sequence
–  Connect fault reader -V.A.G 1551- (V.A.G 1552) and select engine electronics control unit with the “Address code” 01, select control unit. The ignition must be switched on → Injection and Ignition System, 4LV; Rep. Gr.01.
  E01-0119
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 2 for “Display group number 62” and confirm entry with Q -key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on display: (1...4 = Display fields)
–  Check specification of sender 1 -G79- at idling stop in display zone 3 Specifications: 0...100 %
–  Check specification of sender 2 -G185- at idling stop in display zone 4 Specifications: 0...100 %
  Note!
The engine control unit converts the angle sender voltage values expressed in percentages relevant to 5 volts and shows these percentages. (5 Volt supply voltage equates to 100%).
–  Operate the accelerator pedal slowly until fully depressed and observe the angle sender figures in display zones 3 and 4:
The percent figures in display zone 3 and 4 must rise evenly. The tolerance range of 0...100 % is not covered completely.
If the specification is not obtained:
–  Press → -key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Switch off ignition.
–  Adjusting accelerator pedal position sender → Chapter.
If the indication does not vary or only varies irregularly:
–  Check accelerator pedal position sender as follows:
–  Press → -key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q -key.
–  Switch off ignition.
–  Remove lining from under steering column → General body repairs-assembly work; Rep. Gr.68.
  
Read measured value block 62          ->
      1         2        3             4
–  Disconnect connector -1- for accelerator pedal position sender.
  N23-0088
–  Measure sender resistance -G79- between contacts 1+3 of connector Specifications: Accelerator in idling position: 1.0...1.5 kΩ Accelerator in full throttle position: 1.5...2.5 kΩ.
–  Measure sender resistance -G185- between contacts 4+6 of connector Specifications: Accelerator in idling position: 1.0...1.5 kΩ Accelerator in full throttle position: 1.5...2.5 kΩ.
If the specifications are not attained:
–  Replace accelerator pedal position sender -G79- and -G185- → Item.
If the specifications are obtained:
  N23-0018
–  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 6-pin connector (to control unit) for open circuit according to current flow diagram.
   Contact 1+socket 35
   Contact 2+socket 73
   Contact 3+socket 36
   Contact 4+socket 33
   Contact 5+socket 72
   Contact 6+socket 34
   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 → Injection and Ignition System; Rep. Gr.24.
  N23-0017

Accelerator pedal position sender adjustment > < Electronic accelerator warning lamp checking