P0603 INFINITI – Engine Control Module Power Supply Circuit

P0603 INFINITI Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light),Engine may not start

P0603 INFINITI Possible Causes

Loose or poor battery terminal connection,Low battery charge,Faulty Engine Control Module (ECM),ECM power supply circuit is open or shorted,ECM Outdated Program

P0603 INFINITI Description

Battery voltage is supplied to the Engine Control Module (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.