P0603

P0603 ECM POWER SUPPLY




Description
Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory the idle air volume learning value memory, etc.

DTC Logic




DTC DETECTION LOGIC

Step 1-2:

DTC CONFIRMATION PROCEDURE

Step 1:

Step 2-5:

Diagnosis Procedure