Knock Sensors, Checking

Knock Sensors, Checking

Special Tools and Equipment







- VAG1526A
- VAG1594A
- VAG1598/31


NOTE:
- Knock Sensor (KS) 7 -G67- and Knock Sensor (KS) 2 -G66- themselves cannot be electrically tested.
- Use only gold-plated terminals when servicing harness connector for knock sensors.
- For the knock sensors to function properly, it is important that tightening torque be exactly 20 Nm.
- Check harness connector from knock sensor to wiring harness for corrosion.

Check knock sensors







- Disconnect the harness connector of the relevant knock sensor in engine compartment.


NOTE: Coolant reservoir screws must be removed and coolant reservoir must be placed to side in order to access harness connector for knock sensor for bank 2. The coolant hoses can remain connected.







- Check all three terminals at knock sensor connector for short circuit to each other (terminal 1+2, 1+3, 2+3).
- Specification: Infinity Ohms (no continuity) - the wires must not have any connection to each other.
- If there is no connection , replace knock sensor.
- If no short circuit is detected, check knock sensor wires:

Check wires from knock sensors to Engine Control Module (ECM).
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Connecting VAG 1598/31 Test Box
- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

Knock Sensor (KS) 1 -G61-












Knock Sensor (KS) 2 -G66-












- Repair open circuit or short circuit if necessary.