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DTC P0643 SENSOR POWER SUPPLY EC-1009 < SERVICE INFORMATION > [VK45DE] C D E F G H I J K L M A EC N P O DTC P0643 SENSOR POWER SUPPLY On Board Diagnosis Logic INFOID:0000000001326868 This self-diagnosis has the one trip detection logic. FAIL-SAFE MODE When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up. DTC Confirmation Procedure INFOID:0000000001326869 NOTE: Start engine and let it idle for 1 second. 2. Check DTC. 3. If DTC is detected, go to EC-1011, "Diagnosis Procedure" . DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0643 Sensor power supply ECM detects a voltage of power source for • Harness or connectors (APP sensor 1 circuit is shorted.) • Accelerator pedal position sensor Engine operation condition in fail-safe mode ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return |