Knock Sensor (KS) 1 -G61- & Sensor (KS) 2 -G66-, Checking

Knock sensor (KS) 1 -G61- and Knock sensor (KS) 2 -G66-, checking

NOTE:
- It is not possible to perform an electrical test of the knock sensors -G61- and -G66- themselves (check DTC memory).
- To ensure that the knock sensors function properly it is important to keep exactly to the specified tightening torque of 20 Nm.
- Use only gold plated contacts when repairing the contacts in the connectors for the knock sensors.
- Check connector between knock sensor and wiring harness for corrosion.

Checking knock sensors
- Disconnect connector for relevant knock sensor in engine compartment.






- Test for short between all three contacts in knock sensor connector (contacts 1+2, 1+3, 2+3).

Specified value: There must be no connection between any of the wires (infinite resistance)

If there is a connection between the contacts:
- Install a new knock sensor.

If no short is found:
- Check knock sensor wiring.

Checking wiring from knock sensors to engine control module

- Connect test box VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. Connecting VAG 1598/31 Test Box







- Check wiring from relevant sensor connector ...
- ... to engine control module to check for open circuit and short to positive or Ground.

Knock sensor 1 -G61- (Bank 1)

3-pin connector on wiring
harness, socket Test box VAG 1598/31, socket

1 (Ground) 99
2 (signal) 106
3 (screening) 108

3-pin connector on wiring
harness, socket Test box VAG 1598/31, socket

1 (Ground) 99
2 (signal) 107
3 (screening) 108

Wire resistance: max. 1.5 Ohm
- Correct any open/short circuit as necessary.

If no short circuit or open circuit is found:

- Replace engine control module.