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P0603 ECM POWER SUPPLY EC-357 < COMPONENT DIAGNOSIS > [QR25DE FOR CALIFORNIA] C D E F G H I J K L M A EC N P O P0603 ECM POWER SUPPLY Description INFOID:0000000004349392 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 vol- ume learning value memory, etc. DTC Logic INFOID:0000000004349393 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch ON and wait at least 1 second. 2. Start engine and let it idle for 1 second. 3. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON. 4. Repeat steps 2 and 3 for four times. 5. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004349394 1. CHECK ECM POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. PBIA9222J DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0603 ECM power supply cir- ECM back-up RAM system does not function • Harness or connectors [ECM power supply (back-up) circuit is • ECM |