Component Tests and General Diagnostics

ECM Power Source Circuit

CIRCUIT DESCRIPTION
When the ignition switch is turned to ON, positive battery voltage is applied to the coil, closing the contacts of the EFI main relay (Marked: EFI) and supplying power to terminal +B of the ECM.

Wiring Diagram:

Step 1 - 3:

Step 4 - 6:

Step 7:

INSPECTION PROCEDURE