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 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 Engine Control Module (ECM), do not connect ECM. [1][2]Scan Tool Connecting and Initial Checks
- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:







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







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







- Repair open circuit or short circuit if necessary.