Throttle Position Switch: Testing and Inspection

Injection Electronics (Motronic Control Unit). Wiring Diagram:

1. With the ignition switch OFF, disconnect the throttle switch electrical connector.
2. Turn the ignition switch to the run (ON) position and make the following voltage measurements at the connector (female half).

^ Brown/black wire (terminal 3) and ground = approx. 5 volts If not the check wire to terminal 53 of the DME control unit connector for an open or short to ground. If wire is OK, DME control unit is defective.
^ Brown/blue wire (terminal 1) and ground = approx. 5 volts If not check the wire to terminal 52 of the DME control unit connector for an open or short to ground. If wire is OK, DME control unit is defective.
^ Brown/black wire (terminal 3) and brown (terminal 2) = approx. 5 volts If not check wire to ground for an open
^ If all of the voltages are correct replace the throttle switch.