volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Testing speed signal > < Checking intake manifold temperature sender
Motronic fuel injection and ignition system ä 07.95
Motronic injection and ignition system
Checking engine speed sender

Special tools, testers and auxiliary items

  • ◆ Test box V.A.G 1598/18
 
N24-0205
  • ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
  • ◆ Adapter set V.A.G 1594
  • ◆ Current flow diagram

Test sequence

  • ‒ → Detach 3 pin connector to sender -1-.
 
N24-0178
  • ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
 
N24-0206
  • ‒ → Check wiring between test box and 3 pin connector -1- for open circuit according to current flow diagram.
         Contact 1+socket 67
         Contact 2+socket 68
         Contact 3+socket 56
         Wire resistance: Max. 1.5 ω
  • ‒ Additionally check wires for short to one another.
         Contact 1+socket 68
         Contact 1+socket 56
         Contact 2+socket 56
         Specification: ∞ω

If no wiring fault is detected:

  • ‒ Replace engine speed sender (G28).

Testing speed signal > < Checking intake manifold temperature sender