SEAT 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

• ‒ → Separate 3 pin connector to engine speed sender -1-.
• ‒ Connect multimeter using adapter cable from V.A.G 1594 to contacts 1+3, to measure voltage.
• ‒ Switch ignition on.
      Specification: at least 9 V
• ‒ Switch off ignition.

• ‒ Remove dash panel insert.

=> Electrical system; Repair group 90

• ‒ → 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 24-9, item 14.