Aisin Warner
Source-verified model
Aisin Warner TW-40LS
The 4-speed automatic transmission A174 (TW-40) belonging to the "micro" class with a rear drive was designed by Aisin in 1998 on the basis of 3-speed predecessor А172. After testing and update, this transmission was installed on Suzuki Jimni, Escudo, Avery (Landy) with engines from 0.7 up to 1.3 liters. This automatic transmission is considered to be a modern, economical and “invincible” unit for the minimum torque (up to 120 Nm). Americans had been using TW-40E on Ford Pronto with 3-cylinder liter engine until 2007.
Speeds
4
Type
AT
Drive
RWD/AWD
Max torque
120
ATF capacity (L)
3,7
ATF change (L)
2
ATF type
Dexron III
Other and alternative codes of this transmission
TW40-LS
TW40E
TW-40E
TW40
TW-40 LS
TW40LS
TW-40LS
verified naming
OEM designation
source name
Common problems & symptoms
Problems and symptoms reported for this transmission, compiled from repair sources. Not a complete list.
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Friction Clutches Oil Contamination
Friction clutches soaked with oil combustion products require full replacement when burnt oil is detected.
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Burnt Transmission Oil
Burnt oil detected in transmission fluid indicates friction clutch degradation and requires full clutch pack replacement
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Solenoid Wiring Faults
Wiring issues occur on On-Off solenoids responsible for gear shifting and torque converter lock-up operation.
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Valve Body Solenoid Wear
On-Off solenoids and large EPC solenoid in valve body may degrade; burnt oil accelerates solenoid contamination.
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Torque Converter Rebuild Required
Torque converter requires rebuilding during full transmission overhaul; overheating risk is low due to accurate solenoid
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Steel Discs Degradation
Steel disc kit TW-40E requires replacement during complete reassembly to extend transmission service life.
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Traversing Pistons Failure
Six traversing pistons are replaced as a kit during full overhaul, indicating wear-prone sealing components.
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Torque Converter Hard Slippage
Hard slippage in torque converter may indicate solenoid miscalibration or failure affecting lock-up engagement.
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About this transmission
Transmission general data
The 4-speed automatic transmission A174 (TW-40) belonging to the "micro" class with a rear drive was designed by Aisin in 1998 on the basis of 3-speed predecessor А172. After testing and update, this transmission was installed on Suzuki Jimni, Escudo, Avery (Landy) with engines from 0.7 up to 1.3 liters. This automatic transmission is considered to be a modern, economical and “invincible” unit for the minimum torque (up to 120 Nm). Americans had been using TW-40E on Ford Pronto with 3-cylinder liter engine until 2007.
Technical issues and repair guidelines
For reassembly of the A174 unit repair specialists order the repair kit of gaskets and seals, clean the valve body and replace spare parts, and rebuild the torque converter. Transmission experts assume that it is necessary to replace all friction clutches (soaked with oil combustion products) in transmissions operating with burnt oil.
The valve body design of this transmission includes "On-Off" solenoids (responsible for gear shifting and the torque converter lock-up operation), and a big EPC solenoid. Solenoids are adjusted quite accurately and ensure the torque converter actuation without a hard slippage. Therefore the torque converter does not overheat or smudge solenoids too much, allowing solenoids to operate for quite a long time. Sometimes problems occur in wiring of solenoids.
In the process of complete reassembly of А174/TW-40E, transmission specialists replace the following repair kits with the aim to prolong the operation period of the unit:
- Kit of steel discs TW-40E
- Kit of traversing pistons (6 pieces)
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