Component Tests and General Diagnostics

ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned ON, the positive battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay (Marking: EFI) and supplies power to terminal +B of the ECM.

If the ignition switch is turned OFF, the ECM continues to switch on the EFI relay for a maximum of 2 seconds for the initial setting of the throttle valve

Wiring Diagram:

Step 1-3:

Step 4-6:

Step 6(Continued)-8:

Step 9:

Step 9(Continued):

INSPECTION PROCEDURE