Power Supply
When testing power supply to an ECM, the DIS/MoDIC multimeter function as well as a reputable hand held multimeter can be used.
It is best to make the checks at the ECM connection, this method includes testing the wiring harness.
The correct Universal Adapter for the MS41.X application should be used (#88 88 6 614 410). This will ensure the pin connectors and the harness will not be damaged.
The interior of this Universal Adapter is shielded, therefore it is vital that the ground cable is connected to the vehicle chassis whenever the adapter is used.
The adapter uses a Printed Circuit board inside keeping the capacitive and inductive load to a minimum.
When installing the Universal Adapter to the ECM (E36 located below the windshield on the passenger side of the engine compartment, Z3/E39 in the Electronics Box), make sure the ignition is switched off.
The Engine Control Module Relay should be tested using the relay test kit (P/N 88 88 6 613 010).
This kit allows testing of relays from a remote position.
Always consult the ETM for proper relay connections.