Component Tests and General Diagnostics

Injection Electronics (Motronic Control System) With Automatic Transmission. Wiring Diagram:

1. With the ignition switch OFF, disconnect the engine speed/reference sensor connector located at the front and top of the engine.
2. Turn the ignition switch to the run (ON) position and make the following voltage measurements at the engine speed/reference sensor connector (female half).

^ Black wire (terminal 1) and ground = Approx. 5 volts If not check wire to terminal 47 of the DME control unit connector 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 the DME control unit connector 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.