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 SYSTEMSVEHICLE SPEED SENSORDESCRIPTION AND OPERATION
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Vehicle Speed Sensor: Description and Operation
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Description and Operation
CONNECTION
The Vehicle Speed Signal is connected to pin B 9 of the Engine Control Module, the signal is directional IN only (PIN B 9 - INPUT ONLY).
SIGNAL SOURCE
The vehicle speed signal is information about the current vehicle speed and is supplied to the Engine Control Module by the speedometer.
SIGNAL USAGE
The signal is used for idle air control (active below 4 mph) and A/C compressor cut-out (also compare with pin C 10).
Self-diagnosis:
^ Self-diagnosis (OBD) recognizes the fault "no signal".
The Vehicle Speed Signal is connected to pin B 9 of the Engine Control Module, the signal is directional IN only (PIN B 9 - INPUT ONLY).
SIGNAL SOURCE
The vehicle speed signal is information about the current vehicle speed and is supplied to the Engine Control Module by the speedometer.
SIGNAL USAGE
The signal is used for idle air control (active below 4 mph) and A/C compressor cut-out (also compare with pin C 10).
Self-diagnosis:
^ Self-diagnosis (OBD) recognizes the fault "no signal".
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.