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 sequence

• ‒ → Detach 3 pin connector to sender -1-.
• ‒ Switch ignition on.

• ‒ → Check voltage between contacts 1+3 of detached connector.
       Specification: Min. 9 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 68
       Contact 2+socket 67
       Contact 3+socket 16
       Wire resistance: Max. 1.5 ω
• ‒ Additionally check wires for short to one another.
       Contact 1+socket 67
       Contact 1+socket 16
       Contact 2+socket 16
       Specification: ∞ω

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

• ‒ Replace engine speed sender (G28).

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

• ‒ Renew Simos control unit (J361)
  =>Page 24-10 , item 4 .