ECM Power Source Circuit

ECM POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of the "EFI Main" relay and supplying power to the terminal +B of the ECM.

WIRING DIAGRAM





INSPECTION PROCEDURE






























BACK UP POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for use by the diagnostic trouble code memory and air-fuel ratio adaptive control value memory, etc.

WIRING DIAGRAM





INSPECTION PROCEDURE