SEAT Workshop Service and Repair Manuals

Special tools, testers, measuring instruments and auxiliary items required

• ◆ 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

• ‒ Remove dash panel insert:

=> Electrical system; Repair group 90

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.

Knock sensor 1 (G61)

• ‒ → Detach white 3 pin connector to knock sensor 1 -arrow-.

Knock sensor 2 (G66)

• ‒ → Detach black 3 pin connector to knock sensor 2 -arrow-.

• ‒ → Measure resistance between the contacts 1+2, 1+3 and 2+3 at connection to knock sensor.
      Specification: ∞ω

• ‒ → Check wiring between test box and 3 pin connector for open circuit according to current flow diagram.
          G61:    G66:
      Contact 1+socket    34    57
      Contact 2+socket    33    33
      Contact 3+socket    56    56
      Wire resistance: Max. 1.5 ω
• ‒ Additionally check wires for short to one another.
          G61:    G66:
      Contact 2+socket    34    57
      Contact 3+socket    33    33
      Contact 3+socket    34    57
      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 appropriate knock sensor (G61 and/or G66) =>Page 28-5.