Knock sensors, checking: Notes
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2005 Volkswagen GTI, 2004 Volkswagen R32, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, and 2003 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
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) .