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

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


NOTE:
- It is not possible to carry out an electrical test of the knock sensors themselves.
- To ensure that the knock sensors function properly it is important to keep exactly to the specified tightening torque of 20 Nm (15 ft lb)
- Use only gold-plated terminals when repairing the terminals in the plug connectors for the knock sensors.
- Check for corrosion in connection between knock sensor and wiring harness.


Checking knock sensors







- Disconnect harness connector for relevant knock sensor in engine compartment.


NOTE::
- In order to reach the connector for the knock sensor for cylinder bank 2, first remove the bolts securing the coolant reservoir and move the coolant reservoir to one side. Coolant hoses remain attached.







- Check for short circuits between all three terminals in knock sensor connector (terminals 1 + 2, 1 + 3 and 2 + 3).
Specified value: There must be no contact between the wires (Infinite Ohms).

If there is a connection between the terminals.
- Replace knock sensor.


NOTE:
- In order to reach the knock sensors, first remove the air duct. Testing and Inspection
- Use special tool 3247 to remove the knock sensors.


If there is no short circuit
- Check wiring for knock sensors.

Checking wiring between knock sensors and engine control module







- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan Tool Testing/Wiring And Component Check With VAG1598/31 Test Box", Testing and Inspection







- Check wiring connection from relevant sensor connector to...







- .... Engine Control Module (ECM) for open circuit and/or short to B+ or Ground (GND).







Resistance in wiring: max. 1.5 Ohms
- Repair any open/short circuit as necessary.