Knock sensors, checking: Notes
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 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram
Test requirements
- Ground (GND) connections between engine and chassis must be OK.
- Mounting bolts of knock sensors tightened to 20 Nm.
- Ignition switched off.
Check resistances and wires:
- Vehicles with engine code AFP. Refer to Checking resistances and wires (vehicles with engine code AFP) ,
- Vehicles with engine codes BDF and BJS. Refer to Checking resistances and wires (vehicles with engine codes BDF and BJS) .