Volkswagen Workshop Service and Repair Manuals

Special tools, workshop equipment, test and measuring appliances and auxiliary items required

• ◆ V.A.G 1526 A Hand multimeter or multimeter V.A.G 1715
• ◆ V.A.G 1594 A Adapter set
• ◆ V.A.G 1598/31 Test box
• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
• ◆ Current flow diagram

Function

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

Check conditions

• ● Fuses must be OK.
• ● The battery voltage must be at least 11.5 V.

Test sequence

• ‒ Connect 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:

=> Repair group 01; Self-diagnosis; Connecting fault reader V.A.G 1551 and selecting engine electronics 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: 100.0 %
• ‒ Display zone 3:
  The centre position must change to 0.
       Display: 0 0 0

End specification value not achieved:

• ‒ Replace accelerator pedal position sender (G79)
  =>Page 20-32 , item 3 .
• ‒ Interrogate fault memory:

=> Repair group 01; Self-diagnosis; Interrogating fault memory

Display does not change or is erratic:

• ‒ Check accelerator pedal position sender wiring as follows:

• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
• ‒ Remove cover in footwell (driver's side).
• ‒ Disconnect 6-pin connector for accelerator pedal position sender.

• ‒ → Check wiring for open circuit between test box and connector using current flow diagram.
       Contact 1+Socket 63
       Contact 2+Socket 12
       Contact 3+Socket 50
       Contact 4+Socket 69
       Contact 5+Socket 70
       Contact 6+Socket 51
       Wire resistance: max. 1.5 ω
• ‒ Additionally check the wiring for short to battery positive or earth.
• ‒ Additionally check wires for short to one another.

If no fault is detected in the wiring:

• ‒ Replace accelerator pedal position sender (G79)
  =>Page 20-32 , item 3 .
• ‒ Interrogate fault memory:

=> Repair group 01; Self-diagnosis; Interrogating fault memory