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Fuel pump operation : Power from starter solenoid signal is applied to 86a which engergizes relay coil A (fuel pump relay) through the diode which is a one-way device. This prevents the current from flowing from 86b to 86a. When the coil A is energized by the AFM switch or starter solenoid signal, the switch between 88y and 88d (and 88c) is closed and power should appear on 88d and 88c. The wire on 88d runs through engine connector pin 8, through the fuse box and to a connector under the rear seat. From there it runs to fuel pump and in-tank fuel pump Solenoid connection, Battery Connection, Engine Connector, PETER FLORANCE, Corrected location of C47 - 8 Corrected direction of AFM arrow, Addition of AFM voltages, Tach and (-) lead of ignition coil (connection in glove box). Idle switch is closed when throttle is closed (connected) and opens upon throttle opening. Wide Open Throttle switch is open when throttle is closed or part open but closed (connected) when the throttle is wide open. Adjust switches so both conditions can be met. See throttle body FAQ. Air Flow Meter Pump Switch (open when door is closed). Thermo-Time Switch Element on G heats up and combined with engine heat opens switch on terminal W, shutting off cold start valve.
Tags : air flow meter, starter solenoid, fuel pump relay, 1981 bmw 528i, switch element, bmw 528i, fuse box, body faq, throttle switch, tank fuel, 88d, battery connection, connector pin, l jetronic, open throttle
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