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it's call DPFE Sensor Differential Pressure Feedback EGR is located on top of engine square looking with the electrical connector so replace it with part no. 4U7Z-9J460-AA get it from the dealers parts dept. ok disconnect negative side of the battery after installing sensor put negative back on battery then restart let it run ok.
P0734 = 4th gear incorrect ratio (that's the torque converter 'lock-up' clutch - inside the converter). P1401 = doesn't exist for 2002 Hyundai Accent's P1401 exists for 2000 Accent = DM-TL Air Pump Motor Curent Draw is higher or lower than expected (normal is 17-36 mA). DM-TL = Diagnostic Module for Tank Leakage & is part of the Evaporative Emissions Control System.
These two DTC's are not associated/part of the Accent's Engine Managemenet System (EMS). Best to have a qualified/certified Hyundai Service Technician properly diagnose this starting problem with your vehicle.
00-30-001 2000 ACCENT DMTL DIAGNOSIS: DTC CODES P1401, P1402 AND P1403 p1402 - dm-tl air pump motor is shorted or disconnected.
2000 model year accent is equipped with a new enhanced evaporative emission system. this new system is capable of measuring leaks as small as 0.020" diameter. the new system pressurizesthe evaporative emission system with a diagnostic module for tank leakage (dm-tl), while the previous model's system appliedengine vacuum through the purge valve to detect system leaks.
service information
vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
p1402 - dm-tl air pump motor is shorted or disconnected. p1403 - dm-tl changeover valve is shorted or disconnected
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