Component Tests and General Diagnostics

Injection Electronics. Wiring Diagram:

1. With the ignition switch OFF, disconnect the engine speed/reference sensor connector X1522 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 X1522 (female half).

^ Black wire (terminal 1) and ground:

Expected result: = Approx. 5 volts.

If not: check the wire to terminal 47 of the DME control unit connector X1500 for an open and short to voltage or ground.

^ Black wire (terminal 1) and yellow wire (terminal 2):

Expected result: = Approx. 5 volts.

If not: check wire to terminal 48 of connector X1500 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.