Transmission Position Sensor/Switch: Testing and Inspection

Engine Management: Motronic Control Unit 1 (DME/EML 1.7):

1. With the ignition switch OFF, disconnect the DME control unit harness connector (located in the E-Box) see COMPONENT LOCATIONS.
2. Turn the ignition switch to the RUN position and place the transmission range selector in park or neutral. Make the following voltage measurements at the harness connector.

^ Brown/black wire (terminal 65) and ground = Battery voltage. If not, check fuse F17 at the front power distribution box

3. If OK, disconnect harness connector X511 at the transmission range selector switch and make the following voltage/resistance measurements.

^ Brown/black wire (terminal 3) of range selector switch to terminal 65 of the DME control unit = 0 Ohms. If not, check for an open.
^ Terminal 1 of connector X511 and ground = Battery voltage. If not, check wire from terminal 1 to fuse F17 for an open and repair or replace as necessary.

4. If OK, check for continuity at the transmission range selector switch terminals 1 and 3 = 0 Ohms. If not, the transmission range selector switch is defective