Knock Sensors, Checking

Knock Sensors, Checking







Special tools and equipment
- VAG1526A
- VAG1594A
- VAG1598/31


NOTE:
- Knock Sensor (KS) 1 -G61- 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.


Checking knock sensor wiring







- Disconnect harness connector for Knock Sensor (KS) 1 -G61- (item no. 5) or Knock Sensor (KS) 2 -G66- (item no. 4) in engine compartment.







- Check all three terminals at knock sensor connector for short circuit to each other (terminal 1+2, 1+3, 2+3).
- Specification: Infinity (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 Engine Control Module (ECM), do not connect ECM [1][2]Scan Tool Connecting and Initial Checks
- Check following wire connections for open circuit and short circuit to Ground (GND) and B+:







- Knock Sensor (KS) 1 -G61- (cylinder 1/2)

Harness connector VAG1598/31 test box
Terminal Socket
1 (signal) 106
2 (Ground -GND-) 99
3 (shielding) 108






- Knock Sensor (KS) 2 -G66- (cylinder 3/4)

Harness connector VAG1598/31 test box
Terminal Socket
1 (signal) 107
2 (Ground -GND-) 99
3 (shielding) 108

- Repair open circuit or short circuit if necessary.