DME System 2

Injection Electronics (Motronic Control Unit II). Wiring Diagram:

1. With the ignition switch OFF, disconnect the engine speed/reference sensor connector X1615 which is located above the water pump.
2. Turn the ignition switch to the run (ON) position and make the following voltage measurements at X1615 (female half).

^ Black wire (terminal 1) and ground = Approx. 5 volts If not check wire to terminal 47 of the DME control unit connector X1601 for an open and short to voltage or ground
^ Black wire (terminal 1) and yellow wire (terminal 2) = Approx. 5 volts If not check wire to terminal 48 of connector X1601 for an open and short to voltage or ground
^ If voltages are correct measure resistance of engine speed/reference sensor. Resistance should be approximately 540 ohms. Repair or replace wires or sensor as necessary.