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:
- Component location overview.
- 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).
Specification: 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. Refer to "Fuel Injection Volume, Fuel Injector Leakage and Spray Pattern of Injectors, Checking" 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. Connecting VAG 1598/31 Test Box







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







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

Knock Sensor (KS) 1 -G61 (Bank 1)

3-pin connector on VAG1598/31 test box, socket
wiring harness,
socket
1(Ground (GND)) 99
2(signal) 106
3(shielded) 108

Knock sensor (KS) 2 -G66 (Bank 2)

3-pin connector on VAG1598/31 test box, socket
wiring harness,
socket
1(Ground (GND)) 99
2(signal) 107
3 (shielded) 108

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