Back-Up (Batt) Power Supply Circuit

DTC P1600 - ECM BATT Malfunction

CIRCUIT DESCRIPTION
Battery 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.




HINT: If DTC P1600 appears, the ECM is not able to store another diagnostic trouble code.

WIRING DIAGRAM

ECM Back-up Power Supply Circuit:

INSPECTION PROCEDURE