Volkswagen Workshop Service and Repair Manuals

The accelerator pedal position sender is located on accelerator pedal and passes driver's requirement (pedal position) on further to the control unit.

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
• ◆ Test box V.A.G 1598/18
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Test sequence

• ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.
  (Connecting fault reader and selecting engine control unit .)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 0 and 2 for "Display group number 2" and confirm entry with Q key.

• ‒ Display zone 2:
  The accelerator pedal position figure must increase continuously.
       Specification at full throttle position: 100 %
• ‒ Display zone 3:
  The centre position must change to 0.
       Display: 000

On vehicles with an automatic gearbox the kickdown switch pressure point must be distinctly felt before the full throttle stop position is reached.

End specification value not achieved:

• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Adjust accelerator pedal position sender
  

Display does not change or is erratic:

• ‒ Check accelerator pedal position sender as follows:
• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.
• ‒ Switch off ignition.
• ‒ Disconnect connector for sender
  =>Fitting locations overview, Page 23-4 .

• ‒ → Measure sender resistance between connector contacts 1+3.
       Specification:
       Accelerator pedal in idling position: 1.0...1.5 kω
       Accelerator pedal in full throttle position: 1.5...2.5 kω
• ‒ If the specifications are not reached, replace accelerator position sender (G79).

If the specifications are obtained:

• ‒ Connect test box .

• ‒ → Check wiring between test box and connector for open circuit according to current flow diagram.
       Contact 1+ socket 15
       Contact 2+ socket 57
       Contact 3+ socket 55
       Contact 4+ socket 65
       Contact 5+ socket 62
       Contact 6+ socket 33
       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 Diesel direct injection system control unit (J248) => Page 23-118 .