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. Use function "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 (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.

- 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 (infinity ohms).

If there is a connection between the terminals.

- Replace Knock Sensor (KS).

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

Checking wiring between knock sensors and engine control module

- Connect VAG 1598/31 test box to wiring harness for engine control module. DO NOT connect to engine control module itself, Connecting VAG 1598/31 Test Box

- Check wiring connection from relevant sensor connector to engine control module for open circuit and/or short to B+ or Ground (GND).







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

3-pin connector on VAG 1598/31 test box socket
wiring harness socket
1 (Ground (GND)) 99
2 (signal) 106
3 (shielded wire) 108

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

3-pin connector on VAG 1598/31
wiring harness, socket test box socket
1 (Ground (GND)) 99
2 (signal) 107
3 (shielded wire) 108

Resistance in wiring: max. 1.5 ohm

- Correct any open/short circuit as necessary.
- Display readiness code, Readiness Code Reading. If DTC memory was erased generate readiness code, Readiness Code, Generating