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EC-284 < COMPONENT DIAGNOSIS > [VK56DE] P0603 ECM POWER SUPPLY P0603 ECM POWER SUPPLY Component Description INFOID:0000000005149316 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. On Board Diagnosis Logic INFOID:0000000005149317 DTC Confirmation Procedure INFOID:0000000005149318 1. If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next step. a. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch OFF and wait at least 10 seconds. 2. Start engine and let it idle for 1 second. Diagnosis Procedure INFOID:0000000005149319 1. CHECK ECM POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check voltage between ECM terminal 121 and ground with CONSULT-III or tester. OK or NG OK >> GO TO 3. NG >> GO TO 2. 2. DETECT MALFUNCTIONING PART Check the following. PBIB1164E DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0603 ECM power supply circuit ECM back-up RAM system does not function • Harness or connectors [ECM power supply (back-up) circuit is • ECM Voltage: Battery voltage MBIB0026E |