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FL -346 FUEL SYSTEM DTC P0643 SENSOR REFERENCE VOLTAGE "A" CIRCUIT HIGH GENERAL DESCRIPTION E0BACFA5 Refer to DTC P0642. DTC DESCRIPTION EBE58970 P0643 is set when the voltage above 5.158V - maximum voltage of sensor power supply 1 generates from ECM - is DTC DETECTING CONDITION EEEBD270 Item Detecting Condition Possible Cause DTC Strategy • Voltage monitoring Enable Conditions • IG KEY "ON" Threshold Value • when the voltage is above the maximum voltage of sensor power supply.(above 5.158V ) Diagnostic Time • 0.1 sec. Fuel cut NO EGR Off NO Fuel Limit YES Fail Safe Check Lamp NO • MAFS power supply circuit SPECIFICATION EA1AD87A Refer to DTC P0642. SCHEMATIC DIAGRAM ED600D9E Refer to DTC P0642. SIGNAL WAVEFORM AND DATA E90BC064 Refer to DTC P0642. TERMINAL AND CONNECTOR INSPECTION E4EAEA04 Refer to DTC P0642. POWER CIRCUIT INSPECTION E516470E 1. Check power circuit voltage 1) IG KEY "OFF", ENGINE "OFF". 2) Disconnector MAFS connector and APS connector. |