P0740 kia spectra ошибка

KoSTyaN84:

Почему сразу ремонт, что не так? Плохо едет или что, какие симптомы? Уровень масла? Скидывать пробовал ошибку?

Не все так просто Константин! Немного почитал про коробасы и опупел. Уровень масла в первую очередь должен проверяться,все разьемы и предохранители. Запах масла в акпп. Авот потом можно и дальше заморочится. 

Чтобы обеспечить полный контроль над АТ блок ECM иTCM работают совместно, используя общие потоки данных.Блоки завязаны  последовательно через линию коммуникации или Integrated Engine/Transaxle Control шину данных.Система называетсяTorque Reduction Control илиTRC(управление понижением момента). Система TRC улучшает переключения вверх и вниз благодаря: •Отключению на мгновение подачи топлива #1 и #4 форсунки при переключении вверх. •Смещению на мгновение угла опережения зажигания при переключении вниз. Эти действия сглаживают переключения уменьшая момент и варьируя давлением при Эти действия сглаживают переключения, уменьшая момент и варьируя давлением при переключениях. TRC работает когда: •Переключатель диапазонов находится в режиме “D” •Обороты двигателя между 1000 и 6000 об/мин. •Открытие дросселя наименьшее(Параметр TPS более 1.6 В) •Температура охлаждающей жидкости 60Ԩи более. 

Электронная система управления, из установившейся практики, включает само- диагностику, которая осуществляется через ТСМ. Если обнаружены ошибки, ТСМ определяет и запоминает диагностические коды ошибок(Diagnostic Trouble Code), включает лампу индикации “O/DOFF”в режим вспыхивания и включает лампу MIL включает лампу (только для Северной Америки).  Кроме того блокECM установит DTC P1624, запросит MILи сохранит необходимые значения из потока данных, при которых наступила ошибка (заморозит данныеFreeze data). 

Я так понимаю,хоть у нас нет лампы MIL , но данные которые запросит DTC сохранит в  Freeze data . Значит ошибка будет висеть в самой коробке. 

Второй момент.

Предохранительный, аварийный режим (Fail-Safe Mode) 5) Соленоиды переключения А,В,С (Shift Solenoid A, B or C):

 • Соленоиды не функционируют (Remaining solenoids still function) •

Если соленоиды отказали АТ механически переключится в аварийный режим. (If all solenoids fail, transaxle may be manually shifted. (“total failsafe”))

6) Соленоид блокировки ГТ (Damper clutch solenoid): Блокировка отключена (No damper clutch lock-up)

 7) Клапан контроля давления (Pressure Control Valve): Полное давление в линии, переключение очень жесткое (надежное). (Full line pressure at all times, shift quality very firm.)

Получается,когда появляется ошибка связанная с соленоидом ( эл.магнитным клапаном) коробас  выдает ошибку и начинает работать в аварийном режиме только третья передача и задний ход. 

Переключения из других положений селектора происходит жесткое. 

У Вас господа какие ощущения после езды с ошибкой? Что то изменилось в поведении авто?

мануал на англ 2004 > 1.6L DOHC > AT > AUTOMATIC TRANSAXLE > P0740 Torque Converter Clutch Circuit/Open
Torque converter

Diagnostic trouble code
P0740

Torque converter clutch system malfunction

Details
Shift solenoids A, B, C, vehicle speed sensor, input/turbine speed sensor and transaxle fluid temperature sensor function normally. Vehicle speed is between 44 mph (71 km/h) and 65 mph (105 km/h) and difference in the number of engine revolutions and reverse and forward drum revolutions when in 4GR TCC operation is above 100 rpm.

Possible cause
1. Air leak between Throttle Position Sensor (TPS) and Mass Air Flow Sensor (MAFS).
2. ATF level low.
3. Line pressure low.
4. Torque converter clutch slipping.
5. Torque converter control valve or torque converter relief valve stuck.
6. Torque converter clutch (TCC) solenoid valve malfunction.

If any codes relating to TPS or MAFS are present, do ALL repairs associated with those codes before
proceeding with troubleshooting for a P0740 code. A faulty TPS or MAFS can set a P0740.

Step
Inspection
Action

1
Check for cracked intake tube, improperly installed intake tube or other source of air leak between TPS and MAFS.
Were any air leaks found between TPS and MAFS?
Yes
Repair as necessary.

No
Go to step 2.

2
Check ATF level (transaxle at normal operating temperature).
Is ATF level low?
Yes
Check for any signs of leakage from transaxle. Repair as necessary and fill transaxle to full level.

No
Go to step 3.

3
Check ATF condition and compare to following chart.
1. Clear reddish pink: Normal condition.
2. Dark or black (with friction material): Internal transaxle malfunction or excessive wear.
3. Milky pink: Water contamination.
4. Light to dark brown (oxidized): Overheated or worn out fluid.
Is fluid condition other than normal?
Yes
For ATF condition #2, replace transaxle.
For ATF condition #3, replace fluid, repair source of contamination and perform pressure tests. If water contamination is severe, replace transaxle.
For ATF condition #4, replace fluid and perform pressure tests.

No
Go to step 4.

4
Check line pressure and compare to the following chart.

Is line pressure within specification?
Yes
Go to step 5.

No
Replace transaxle.

5
Check torque converter front chamber pressure as follows:
1. Remove front chamber access plug. NOTE: Front chamber pressure access plug is accessible through the front of the cut-out in the engine support cross member. It is the second 5 mm allen headed plug (counting from the bottom of the transaxle forward).
2. Screw pressure port adapter into front chamber port and attach adapter to 100 psi gauge.
3. Disconnect H-04 from transaxle and attach a 10 amp fused jumper wire to the #2 pin at the transaxle (make the jumper wire long enough to reach the battery positive post).
4. Raise vehicle on the lift so the tires are at least 5 inches off of the floor and apply hand brake.
5. Start engine and warm it up to operating temperature.
6. Shift transaxle into D and raise vehicle speed to approximately 40 to 50 mph.
7. While maintaining vehicle speed, touch loose end of jumper wire to battery positive post and observe front chamber pressure. Front chamber pressure will drop in 2 stages within 2 seconds with TCC energized.
Front chamber pressure
TCC solenoid off — approximately 88 to 92 psi.
TCC solenoid on — approximately 30 to 38 psi.
Is the front chamber pressure within specification and does it drop as described within 2 seconds?
Yes
Replace valve body.

No
Remove transaxle drain pan and TCC solenoid from valve body. Attach a short piece of hose to TCC solenoid nipple. Blow through hose and verify air does not escape from hole in body of solenoid. Jumper a wire from solenoid body to battery negative and another wire from solenoid terminal to battery positive. Blow through hose and verify air escapes from hole in body of the solenoid. If TCC solenoid checks okay, replace valve body.
Clear codes and verify any repairs by driving vehicle with Hi-scan Pro connected to OBD-II connector

The torque converter can only be checked by the use of special equipment. If replacing valve body does not repair vehicle, replace transaxle.

Изменено 14 июля 2009 пользователем sergo

<div align=’center’></div>мануал на англ 2004 > 1.6L DOHC > AT > AUTOMATIC TRANSAXLE > P0740 Torque Converter Clutch Circuit/Open

Torque converter

Diagnostic trouble code

P0740

Torque converter clutch system malfunction

Details

Shift solenoids A, B, C, vehicle speed sensor, input/turbine speed sensor and transaxle fluid temperature sensor function normally. Vehicle speed is between 44 mph (71 km/h) and 65 mph (105 km/h) and difference in the number of engine revolutions and reverse and forward drum revolutions when in 4GR TCC operation is above 100 rpm.

Possible cause

1. Air leak between Throttle Position Sensor (TPS) and Mass Air Flow Sensor (MAFS).

2. ATF level low.

3. Line pressure low.

4. Torque converter clutch slipping.

5. Torque converter control valve or torque converter relief valve stuck.

6. Torque converter clutch (TCC) solenoid valve malfunction.

If any codes relating to TPS or MAFS are present, do ALL repairs associated with those codes before

proceeding with troubleshooting for a P0740 code. A faulty TPS or MAFS can set a P0740.

Step

Inspection

Action

1

Check for cracked intake tube, improperly installed intake tube or other source of air leak between TPS and MAFS.

Were any air leaks found between TPS and MAFS?

Yes

Repair as necessary.

No

Go to step 2.

2

Check ATF level (transaxle at normal operating temperature).

Is ATF level low?

Yes

Check for any signs of leakage from transaxle. Repair as necessary and fill transaxle to full level.

No

Go to step 3.

3

Check ATF condition and compare to following chart.

1. Clear reddish pink: Normal condition.

2. Dark or black (with friction material): Internal transaxle malfunction or excessive wear.

3. Milky pink: Water contamination.

4. Light to dark brown (oxidized): Overheated or worn out fluid.

Is fluid condition other than normal?

Yes

For ATF condition #2, replace transaxle.

For ATF condition #3, replace fluid, repair source of contamination and perform pressure tests. If water contamination is severe, replace transaxle.

For ATF condition #4, replace fluid and perform pressure tests.

No

Go to step 4.

4

Check line pressure and compare to the following chart.

Is line pressure within specification?

Yes

Go to step 5.

No

Replace transaxle.

5

Check torque converter front chamber pressure as follows:

1. Remove front chamber access plug. NOTE: Front chamber pressure access plug is accessible through the front of the cut-out in the engine support cross member. It is the second 5 mm allen headed plug (counting from the bottom of the transaxle forward).

2. Screw pressure port adapter into front chamber port and attach adapter to 100 psi gauge.

3. Disconnect H-04 from transaxle and attach a 10 amp fused jumper wire to the #2 pin at the transaxle (make the jumper wire long enough to reach the battery positive post).

4. Raise vehicle on the lift so the tires are at least 5 inches off of the floor and apply hand brake.

5. Start engine and warm it up to operating temperature.

6. Shift transaxle into D and raise vehicle speed to approximately 40 to 50 mph.

7. While maintaining vehicle speed, touch loose end of jumper wire to battery positive post and observe front chamber pressure. Front chamber pressure will drop in 2 stages within 2 seconds with TCC energized.

Front chamber pressure

TCC solenoid off — approximately 88 to 92 psi.

TCC solenoid on — approximately 30 to 38 psi.

Is the front chamber pressure within specification and does it drop as described within 2 seconds?

Yes

Replace valve body.

No

Remove transaxle drain pan and TCC solenoid from valve body. Attach a short piece of hose to TCC solenoid nipple. Blow through hose and verify air does not escape from hole in body of solenoid. Jumper a wire from solenoid body to battery negative and another wire from solenoid terminal to battery positive. Blow through hose and verify air escapes from hole in body of the solenoid. If TCC solenoid checks okay, replace valve body.

Clear codes and verify any repairs by driving vehicle with Hi-scan Pro connected to OBD-II connector

The torque converter can only be checked by the use of special equipment. If replacing valve body does not repair vehicle, replace transaxle.