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

Work sequence

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Check wiring between test box sockets 56 and 58 for open circuit according to current flow diagram.
       Wire resistance:
       Vehicles with automatic gearbox: Max. 1.5 ω
       Vehicles with manual gearbox: ∞ ω

If the specifications are not attained:

• ‒ Locate and repair open circuit using current flow diagram.

An incorrect coding leads to:

• ◆ Engine running faults
• ◆ Increased fuel consumption
• ◆ Increased emissions
• ◆ Faults stored in fault memory which are not actually present
• ◆ Reduced gearbox life