With Generic Scan Tool

Check Knock Sensors

Recommended special tools and equipment







- VAG1526A multimeter
- VAG1594A connector test kit
- VAG1598/31 test box

NOTE:
- Knock Sensor (KS) 1 -G61- and Knock Sensor (KS) 2 -G66- themselves cannot be electrically tested.
- When servicing terminals in harness connector of knock sensors, use only gold-plated terminals.
- 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.

Test requirement:
- Ignition switched off.

Checking knock sensor wiring







- Disconnect electrical 3-pin harness connector -3- for Knock Sensor (KS) 1 -G61-.







- Disconnect electrical 3-pin harness connector -3- for Knock Sensor (KS) 2 -G66-.







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

If no malfunction can be found:

Check wires from knock sensors to Engine Control Module (ECM).
- Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected. Test Box, Connecting For Wiring Testing







- Check the following wire connections for open circuit according to wiring diagram:
- Knock Sensor (KS) 1 -G61- (bank 1)

Harness connector Test box
Terminal Socket
1 (signal) 106
2 (Ground -GND-) 99
3 (shielding) 108

- Knock Sensor (KS) 2 -G66- (bank 2)

Harness connector Test box
Terminal Socket
1 (signal) 107
2 (Ground -GND-) 99
3 (shielding) 108

- Specified value: Wire resistance max 1.5 Ohms
- Also check wires for short circuit to each other as well as to B+ and Ground (GND).
- Specified value: Infinity Ohms (no continuity)
- If necessary, repair wire connection.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1 - Check DTC memory, Diagnostic mode 3 - Check DTC memory. Diagnostic Mode 3: Check DTC Memory
2 - Erase DTC memory, diagnostic mode 4 - Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
3 - Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.