1986 Audi 5000S Front Wheel Drive Automatic 92450 miles
Although I understand how a simple relay circuit works for a fuel pump, I need an explanation of the control for the relay in this car which uses a Hall-effect transducer and an ignition control unit. I don't understand what it takes to energize the relay. The one I have is unreliable and will work most times. Then again, I can get in the car and the relay won't energize. The relay was replaced. This is the circuit.
References as follows:
Input 30-Batt 12V
Input 15-12V Switched from ignition
Input d-ignition coil term. 1 fed from ICU outputInput e-02 sensor heater
have the same problem?
Tuesday, May 25th, 2010 AT 4:41 PM