Volkswagen Workshop Service and Repair Manuals

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

Test conditions

• ● Sender fault is recognised by self diagnosis

Test sequence

• ‒ Pull plug off sender (distributor).
• ‒ → Connect multimeter to measure voltage with aux. cables from V.A.G 1594 to the outer contacts of the plug.
• ‒ Switch on ignition.
       Specification: At least 10 V
• ‒ Switch off ignition

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Check wiring between test box and 3 pin connector for open circuit according to current flow diagram.
       Contact 1+socket 33
       Contact 2+socket 44
       Contact 3+socket 45
       Wire resistance: Max. 1.5 ω
• ‒ Additionally check wires for short to one another.
       Specification: ∞ω

If no wiring fault is detected and voltage was present between contacts 1+3:

• ‒ Renew sender .

If no wiring fault is detected and no voltage was present between contacts 1+3:

• ‒ Renew Digifant control unit (J169)
  , item 11 .