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P0643 SENSOR POWER SUPPLY EC-365 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] C D E F G H I J K L M A EC N P O P0643 SENSOR POWER SUPPLY On Board Diagnosis Logic INFOID:0000000009886789 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:0000000009886790 NOTE: If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next step. Before performing the following procedure, confirm that battery voltage is more than 10V at idle. 1. Start engine and let it idle for 1 second. 2. Check DTC. 3. If DTC is detected, go to . Diagnosis Procedure INFOID:0000000009886791 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. 2. Loosen and retighten three ground screws on the body. OK or NG OK >> GO TO 2. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0643 Sensor power supply circuit ECM detects a voltage of power source • 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 BBIA0354E |