Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORDESCRIPTION AND OPERATION
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Knock Sensor: Description and Operation
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Description and Operation
PURPOSE
Signals from the knock sensors are used by the Engine Control Module for adaptive cylinder selective knock control.
OPERATION
The ignition timing of an individual cylinder can be retarded if a knock is detected. If knock continues, the ECM will switch from the premium fuel ignition map to the ignition map for regular fuel. Cylinders 1,2,3 are monitored by knock sensor I, and cylinders 4,5,6 are monitored by knock sensor II.
Knock control is now adaptive which means that the system will adapt to fuel quality and driving conditions.
Signals from the knock sensors are used by the Engine Control Module for adaptive cylinder selective knock control.
OPERATION
The ignition timing of an individual cylinder can be retarded if a knock is detected. If knock continues, the ECM will switch from the premium fuel ignition map to the ignition map for regular fuel. Cylinders 1,2,3 are monitored by knock sensor I, and cylinders 4,5,6 are monitored by knock sensor II.
Knock control is now adaptive which means that the system will adapt to fuel quality and driving conditions.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.