2002 hyundai accent engine light code P1401 - 1996 Nissan Altima

Change the rear oxygen sensor on the exhaust system.

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.

The 2000 model year Accent adopts a different "pressurized" leak check system capable of detecting a 0.020" (0.5 mm) diameter leak (previous Hyundai systems detect a 0.040" [1mm] diameter leak using engine vacuum). The new system uses a Diagnostic Module for Tank Leakage (DM-TL) to close and pressurize the fuel evaporative emissions system. The DM-TL replaces the fuel tank pressure sensor and the canister close valve from previous systems. Other significant changes were made to the system logic, including several new diagnostic trouble codes. It compares the differences between the 2000 model year Accent and previous evaporative emission systems... Que puede ser? Tiene dos opciones. Primero, puede pagar que un tecnico diaga el problema (exactamente) o sigue, secudariamente, su adivnaza.

P1401 - DMTL Malfunction
The diagnosis module comprises an electromechanically driven pump together with a change-over valve and heater. The engine management system measures the pump's electrical current consumption while pumping air into the canister and fuel tank to check the system's leakage.
If the electrical current consumption is over the threshold value specified before in the memory, this means that there is a tank-system leak.

2. DM-TL operating conditions.
(1) DM-TL monitoring operation starts only after all the conditions below are met.
A. Vehicle soaking over 4 hours and 30 minutes.
B. Engine coolant temperature over 2.3°C (36.14°F) when starting.
C. Ambient temperature between 1.5°C (34.7°F) and 40.5°C (104.9°F).
D. 6.4l or more gasoline in the fuel tank.
E. Over 20 minutes driving after starting.
F. During Air Bag is not working.

(2) And also you can check the DM-TL operation with simulation mode of HI-SCAN.

Diagnostic: "module Tank Leakage (DMTL) Failure"

Probale cause:

1) Open Or Short Circuit Condition

2) Poor Electrical Conection

3)Faulty DMTL Module Faulty



Read more: http://wiki.answers.com/Q/What_is_a_p1401_code_on_a_2002_hyundai_accent#ixzz1Ep0tl2tO Call your service dept on the phone as I have heard they dont use the code...better call dealership for free and find out. Hoped I helped you in the right direction

CODE P1401 IS FUEL TANK LEAKAGE DIAGNOSTIC MODULE SYSTEM MALFUNCTION.

FUEL TANK LEAKAGE DIAGNOSTIC MODULE FAULTY

P1401 - DM-TL air pump motor current draw is higher or lower than expected (normal = 17-36 mA).

This is an electrical issue with the pump, it's not related to a leak in the evaporative emission control system.

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