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ECM-306 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] P0643 SENSOR POWER SUPPLY P0643 SENSOR POWER SUPPLY DTC Description INFOID:0000000010702999 ECM supplies a voltage of 5 V to some of the sensors systematically divided into 2 groups, respectively. Sensor power supply 1 • CKP sensor (POS) Sensor power supply 2 • Barometric pressure sensor DTC DETECTION LOGIC POSSIBLE CAUSE • Harness or connectors FAIL-SAFE DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure 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. TESTING CONDITION: DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition P0643 SENSOR POWER/CIRC ECM detects that the voltage of sensor power supply 1 is excessively low Engine operating condition in fail-safe mode Fail safe mode Vehicle behavior Others ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed |