Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598/31

Fitting location => Fitting locations overview, Page 24-5

Notes:

• ◆ The knock sensors -G61 and -G62 cannot themselves be tested electrically.
• ◆ Use only gold-plated contacts when repairing the cable connectors for the knock sensors.
• ◆ To ensure that the knock sensors function properly it is important to keep exactly to the specified tightening torque of 20 Nm.
• ◆ Check connector between knock sensor and wiring harness for corrosion.

Test sequence

• ‒ Remove the knock sensor.

• ‒ → Detach connector.
• ‒ Connect multimeter between contacts 1 and 2 on knock sensor to measure resistance.
• ‒ Specified value: ∞ω (no continuity)

If specified value is not attained:

• ‒ Replace the knock sensor.
• ‒ Tightening torque: 20 Nm

If specified value is attained:

• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit .
• ‒ Check for open circuit and short to earth/positive or earth in the following wiring connections:

• ● → Knock sensor 1 -G61 (cylinders 1/2)

• ● Knock sensor 2 -G66 (cylinders 3/4)

• ‒ Rectify any open/short circuit as necessary.

If no wiring fault is detected:

• ‒ Replace engine control unit => Page 24-32.