1251 - Fuel Injectors 1-3-5

Injection Electronics (Motronic Control Unit). Wiring Diagram:

DME Control Unit Harness Connector:

1. With the ignition switch in the "OFF" position, disconnect the Digital Motor Electronic (DME) control unit harness connector (control unit is located in the glove Box). See COMPONENT LOCATIONS.
2. Connect a FUSED jumper between brown wire (terminal 36), of the DME control unit connector and ground.
3. Turn the ignition switch to the run position and MOMENTARILY connect a FUSED jumper between brown/white wire (terminal 16), of the DME control unit connector and ground.
4. Listen and feel fuel injectors 1-3-5.

^ If all three fuel injector valves click, remove fused jumpers. Replace the DME control unit.
^ If one or more fuel injection valves do not click, remove FUSED jumper at brown/white wire (terminal 16).

5. With the ignition switch in the OFF position, disconnect the harness connectors from fuel injector valves 1, 3, and 5.
6. Turn the ignition switch to the run position and measure the voltages of each fuel injector connector.

^ Red/White wire (terminal 2) and ground = Battery voltage. If not check wire to the DME main relay for open.
^ Brown/white (terminal 1) and red/white wire (terminal 2) = 0 volts. If not check Brown/white wire to terminal 16 of DME control unit for a short to ground.
^ Brown/white wire (terminal 1) and ground = 0 volts. If not check wire to terminal 16 of the DME control unit for a short to voltage.

7. Reconnect a FUSED jumper between terminal 16 of the DME control unit harness connector and ground.

^ Brown/white (terminal 1) and red/white wire (terminal 2) = battery voltage. If not, check brown/white wire to terminal 16 of connector for an open.
^ If all the voltages are correct, remove fused jumpers and replace the defective fuel injector(s).