Coolant Guage Operation and Sensors

Coolant Guage Operation and Sensors - TESTING THE COOLANT...

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TESTING THE COOLANT GAUGE OPERATION: If you have the original 4 terminal VDO brand sensor, make sure the +12V wiring connection (3/+) has power. You could have a blown fuse, check the wiring diagram for your vehicle. If you unplug the connector from the sensor and ground the corresponding terminal 1/T (BR/Y wire) in the connector, the coolant temperature gauge in the instrument cluster should go to a max temp reading with the ign. key on. Testing Other Functions of this Sensor: Terminal 2/R provides a ground signal to the Engine Control Unit (1986-88 Audi 5000T/5000TQ and 1989-91 200T/200TQ) if the engine is running too hot (over 247F, 119C) which will reduce the amount of boost the ECU will provide. You can temporarily run the car with the Multi-Function Temperature Sensor connector unplugged to verify if the sensor has malfunctioned and is causing the low boost problem. Note: The 1992-95 Audi S4/S6 Engine Control Unit (ECU) does not use this over temp signal from the Multi-Function Temperature Sensor to lower boost when the engine overheats, it uses the signal from the ECU coolant temperature sensor mounted at the back of the cylinder head. The 1995 Audi S6 may not have the +12V wiring connection for this sensor (Black wire with blue stripe) Terminal 2/R also provides a ground signal from this same connection to the A/C control head unit which also will turn off the A/C if the engine temp. exceeds 247F.
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