Knock Sensor: Testing and Inspection

Knock Sensors, Checking

NOTE:
- 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
- V.A.G 1526 portable multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

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

Checking resistances and wires
I Engine code AEB, ATW
II Engine code AUG, AWM







- Disconnect 3-pin harness connector to Knock Sensor (KS) 1 -G61- (green, -1-) and/or 3-pin harness connector to Knock Sensor (KS) 2 -G66- (blue, -2-).
- Measure resistance between terminals 1 + 2, 1 + 3, and 2 + 3 at connectors to knock sensors.
Specified value: Infinite ohms

If specified value is not obtained:
- Replace the respective knock sensor:

If specified value is obtained:
- Connect test box to control module wiring harness. connect test box for wiring test.

Vehicles with engine code AEB







Vehicles with engine code ATW, AUG, AWM







Continued for all vehicles
- Check wires for short circuit to each other.

If no malfunctions are found in wires:
- Replace the respective knock sensor
- 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. Monitors, Trips, Drive Cycles and Readiness Codes