Engine stalling in”D” range after starting the engine – torque converter/Sonata NF

model: Sonata NF	year model: 2005	mileage:124674 km
Displacement: 2400cc	Fuel: Gasoline	T/A Auto

Subject: Engine stalling in “D” range after starting the engine – torque converter.

1) Condition:

• Engine stalling when the auto transmission is in “D” range after starting the engine

2) Cause:

• Sticking of torque converter

3) Diagnosis:

1. Inspect the auto transmission oil = Normal
2. Scantool check = No trouble code.
3. Stall test – the speed is not increased more than 2500 rpm.
   = Standard value ( Stall speed: 2000 – 2500 rpm).
4. Check the ignition coil and plug – Normal.
5. Inspect the waveform of CKP = Normal.
6. Inspect the coil pump and torque converter.
   =The torque converter has been interfered with oil pump housing.

4) Repair Guide:

1. Engine stall when shifting
   = If the engine stall when the selector lever is shifted from N to D or R range while the engine is Idling, the cause probably a malfunction of the engine system, torque converter clutch solenoid, valve body or torque converter( torque converter clutch malfunction).
2. Probably cause
   = Malfunction of engine system.
   = Malfunction of torque converter solenoid.
   = Malfunction of the valve body.
   = Malfunction of torque converter.
   ( Malfunction of torque converter clutch.

Engine system check:

1. Check the control system, ignition , fuel system and main system =====>Repair  , replace.
2. ok?
3. Replace the torque converter clutch solenoid
4. Replace the torque converter.

• Torque Converter  stall test  Judgment results.

1. Stall speed too high in booth R and D range.
   = Low line pressure.
   = Low and reverse brake slippage.
2. Stall speed is too high in D range only.
   = Reverse clutch slippage.
3. Stall speed is too high in R range only.
   = Reverse slippage.
4. Stall speed too low in D and R ranges.
   = Malfunction of torque converter.
   = Insufficient engine output. 
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