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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE SPEED SENSORDESCRIPTION AND OPERATION
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Engine Speed Sensor: Description and Operation
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Description and Operation
PURPOSE
The Engine Speed Sensor provides the ECM with constant engine speed for use in Ignition timing control and Idle speed control.
OPERATION
The Engine Speed Sensor scans the teeth on the starter ring gear. The sensor scans the number of teeth per unit of time to produce an engine speed signal. This signal is used for engine speed and ignition timing angle.
The Engine Speed Sensor provides the ECM with constant engine speed for use in Ignition timing control and Idle speed control.
OPERATION
The Engine Speed Sensor scans the teeth on the starter ring gear. The sensor scans the number of teeth per unit of time to produce an engine speed signal. This signal is used for engine speed and ignition timing angle.
RENDER: 1.0x
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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.