With Generic Scan Tool

Knock Sensors, Checking

NOTE:
- To remove and install Knock Sensors, intake manifold must be removed.
- 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.

Checking resistances and wires







- Disconnect 3-pin harness connector to knock sensors:
A - Knock Sensor (KS) 1 -G61-, cylinder bank 1
B - Knock Sensor (KS) 2 -G66-, cylinder bank 2

NOTE:
- To reach the harness connector of Knock Sensor (KS) 2 -G66-, remove coolant reservoir securing screws and tilt coolant reservoir to the side. The coolant hoses remain connected.
- Cylinder bank 1 = in driving direction, right
- Cylinder bank 2 = in driving direction, left







- Measure resistance between terminals 1 & 2, 1 & 3, and 2 & 3 at connectors to knock sensors.
Specified value: Infinite Ohm
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- Check wires between test box and 3-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm







- Also check wires for short circuit to each other.
Specified value: Infinite Ohm

If no wiring faults are found:
- Replace the respective knock sensor:
- Knock Sensor (KS) 1 -G61- cylinder bank 1
- Knock Sensor (KS) 2 -G66- cylinder bank 2
- 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