With Generic Scan Tool

Check Knock Sensors

- Contact surfaces between knock sensor and cylinder block must be free of corrosion, dirt and grease.
- For the Knock Sensors to function properly, it is important for tightening torque to be exactly 20 Nm.
- Use only gold-plated terminals when servicing terminals in harness connector of knock sensors.

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements
- Knock sensor securing bolt tightened to 20 Nm.
- Ignition switched off.

Vehicles with engine code AMU, ATC

Checking resistances and wires
- Disconnect the harness connector of the relevant knock sensor in engine compartment.







- Measure resistance between terminals 1 + 2, 1 + 3, and 2 + 3 at connectors to knock sensors.
Specified value: Infinite Ohm

If specified value is not obtained:
- Replace Knock Sensor(s)

If specified value is obtained:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
- Check for open circuits in wires between test box and connector according to wiring diagram.







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

Harness connector Knock Sensor VAG1598/31 test box
(KS) 1 - G61-
Terminal Socket
1 (signal) 106
2 (Ground -GND-) 99
3 (shielding) 108

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

Harness connector Knock Sensor VAG1598/31 test box
(KS) 2 - G66-
Terminal Socket
1 (signal) 107
2 (Ground -GND-) 99
3 (shielding) 108

- Check wires for short circuit to each other.

Vehicles with engine code AWP, BEA

Checking resistances and wires
- Remove Knock Sensor (KS).







- Disconnect harness connector.
- Connect multimeter between terminal 1 and 2 of Knock Sensor (KS) for resistance measurement.
Specified value: Infinite Ohm(no continuity)

If specified value is not obtained:
- Replace Knock Sensor(s)

If specified value is obtained:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
- Check for open circuits in wires between test box and connector according to wiring diagram.







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

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

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

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

- Check wires for short circuit to each other.

Continuation for all vehicles
If no malfunctions are found in wires:
- Replace the respective knock sensor:

Vehicles with engine code AMU
- Knock Sensor (KS) 1 -G61-, item 23
- Knock Sensor (KS) 2 -G66-, item 15

Vehicles with engine code ATC
- Knock Sensor (KS) 1 -G61-, item 22
- Knock Sensor (KS) 2 -G66-, item 18

Vehicles with engine code AWP
- Knock Sensor (KS) 1 -G61-, item 23
- Knock Sensor (KS) 2 -G66-, item 19

Vehicles with engine code BEA
- Knock Sensor (KS) 1 -G61-, item 28
- Knock Sensor (KS) 2 -G66-, item 19

Continuation for all vehicles
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Readiness Code, Generating