volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Checking ignition transformer > < Checking Hall sender
Motronic fuel injection and ignition system ä 07.95
Motronic injection and ignition system
Checking knock sensor

Special tools, testers and auxiliary items

  • ◆ 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
 
N28-0022

Test sequence

  • ‒ → Separate brown 3 pin connector -2- to knock sensor 1 (G61) -1-.
  • ‒ Measure resistance between the contacts 1+2, 1+3 and 2+3 at connection to knock sensor.
         Specification ∞ω

If the specification is attained:

 
N24-0178
  • ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
 
N28-0023
  • ‒ → Check wiring between test box and 3 pin connector for open circuit according to current flow diagram.
         Contact 1+socket 34
         Contact 2+socket 33
         Contact 3+socket 56
         Wire resistance: Max. 1.5 ω
  • ‒ Additionally check wires for short to one another.
         Contact 3+socket 34
         Contact 3+socket 33
         Contact 2+socket 34
         Specification: ∞ω

If no wiring fault is detected:

  • ‒ Loosen knock sensor and tighten again to 20 Nm.

If the fault is still present (fault again in fault memory):

  • ‒ Replace knock sensor.

Checking ignition transformer > < Checking Hall sender