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EC-316 < COMPONENT DIAGNOSIS > [QR25DE] P0603 ECM POWER SUPPLY P0603 ECM POWER SUPPLY Description INFOID:0000000004211551 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:0000000004211552 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch ON and wait at least 1 second. 2. Turn ignition switch ON (READY). 3. Depress the accelerator pedal to start engine, then keep engine running for at least 1 seconds. 4. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON. 5. Repeat steps 2 and 4 for four times. 6. Check 1st trip DTC. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004211553 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 |