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EC-334 < COMPONENT DIAGNOSIS > [VQ35HR] P0603 ECM POWER SUPPLY P0603 ECM POWER SUPPLY Description INFOID:0000000003133487 Battery voltage is supplied to the ECM even when the ignition switch DTC Logic INFOID:0000000003133488 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> 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. Is 1st trip DTC detected? YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000003133489 1. CHECK ECM POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check the voltage between ECM harness connector terminals under the following conditions. Is the inspection result normal? JMBIA0057ZZ 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 ECM Voltage + – Connector Terminal Connector Terminal F102 93 M107 128 Battery voltage |