OIL COOLER
The oil is routed in/out in separate lines to the external oil cooler.
Scheme 1402
| Number | Designation | Number | Designation |
|---|---|---|---|
| 1 | Transmission control module (TCM) | 5 | Oil cooler |
| 2 | Torque converter | 6 | Oil pump |
| 3 | Valves and solenoids | 7 | Planetary train |
| 4 | Clutches and brakes | 8 | Oil sump |
The transmission's hydraulic system consists of oil pump, torque converter, hydraulic control system and oil cooler.
The solenoids, which control the hydraulic valves, are located in the transmission's control system, which are mounted on the front edge of the transmission. The solenoids are activated by the Transmission control module (TCM).
The oil pump supplies the hydraulics with oil and supplies the other components of the transmission with oil for lubrication and cooling. Excess oil is routed back to the oil sump.
| CAUTION | The transmission oil differs from conventional ATF oil properties. Always use transmission oil that is specified for this transmission. Otherwise the function of the transmission will be damaged. |
The oil level is checked though a level pipe (transmission does not have conventional oil dipstick).
Scheme 1403
| S1 = Solenoid, S1 | SLU = Lock-up solenoid, SLU |
|---|---|
| S2 = Solenoid, S2 | C1 = Clutch, C1 |
| SLC1 = Line pressure solenoid, SLC1 | C2 = Clutch, C2 |
| SLC2 = Line pressure solenoid, SLC2 | C3 = Clutch, C3 |
| SLC3 = Line pressure solenoid, SLC3 | B1 = Brake, B1 |
| SLB1 = Line pressure solenoid, SLB1 | B2 = Brake, B2 |
| SLT = Line pressure solenoid, SLT | LU = Lock-up |
Shifting occurs by the oil pump building up hydraulic pressure. The hydraulic valves, which are controlled by their respective solenoids, send the hydraulic pressure to the relevant clutch, brake or lock-up depending on which signals come from the Transmission control module (TCM).
Hydraulic pressure chamber
Scheme 1404
A = Piston's hydraulic pressure chamber
B = Counter acting hydraulic pressure chamber
When the rotation of the clutch increases, the centrifugal force affects the oil inside the clutch. The hydraulic pressure increases and the clutch engages. The centrifugal force means that a difference occurs in the rotation between the input and output shafts, which can mean a shift judder. To solve this, there is an extra pressure chamber opposite the piston's hydraulic pressure chamber. This extra pressure chamber means that the centrifugal force also works in the opposite direction and therefore affects the pressure from the piston's hydraulic pressure chamber. In addition, the clutch does not engage too soon.
Scheme 1405
The gear selector assembly is in the tunnel console. It is mechanically connected to the transmission by a cable which moves the gear valve. The gear valve is integrated in the Transmission control module (TCM). The gear selected is indicated by a row of LEDs in the top panel on the gear selector assembly.
Gear selector assemblies with Geartronic, in addition to P/R/N/D modes, have a manual (M) shifting mode. The manual gear positions can be selected at any point while driving. The engaged gear is locked until the driver selects another gear. The automatic transmission only down shifts if the vehicle slows down to very low speed. To downshift the gear selector must be moved to minus (-). To upshift the gear selector must be moved to plus (+). At start, 3rd is the highest possible gear.
The engine can only be started in position P or N.
| Position | Meaning | Function |
|---|---|---|
| P | Park | The transmission's output shaft is locked, so that the vehicle does not roll. This position should be selected when the engine is started or the vehicle is parked. |
| R | Reverse | Reverse gear. This mode may only be engaged when the vehicle is completely stationary. |
| N | Neutral | Neutral means that no gear is engaged. The engine can start and run freely. |
| D | Drive | When D is engaged, the engine drives the vehicle forward except when idling. The D position is used for all forward motion. Up and down shifting occurs automatically depending on acceleration and speed. |
| M | Manual | This position allows the driver to change gears manually. |
THE DIFFERENT GEAR SELECTOR POSITIONS
POWER FLOW
Clutches, brakes and freewheel
Scheme 1406
| Clutch/Brakes | Function |
|---|---|
| Clutch C1 | Connects the front planetary gear carrier with the rear planetary train's small sun gear. |
| Clutch C2 | Connects the input shaft with the rear planetary gear carrier. |
| Clutch C3 | Connects the front planetary gear carrier with the rear planetary train's large sun gear. |
| Brake B1 | Locks the rear planetary train's large sun gear. |
| Brake B2 | Locks the rear planetary train's planetary gear carrier. |
| Freewheel F1 | Locks the rear planetary gear carrier so that it does not go counter-clockwise. |
Position D, 1st gear
Scheme 1407
| Solenoid | Clutch | Brakes | Freewheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SLC1 | SLC 2 | SLC 3 | SLB1 | S1 | S2 | C1 | C2 | C3 | B1 | B2 | F1 |
| X | X | X | X | * | X | ||||||
X = activated
= not activated
* B2 is only active during engine braking.
| Planetary train unit | Power in | Locked | Power out |
|---|---|---|---|
| Front | Ring gear | Sun gear | Planetary gear carrier |
| Rear | Small sun gear | Planetary gear carrier | Ring gear |
The input shaft rotates clockwise, the same direction as the torque converter's turbine rotor.
The front planetary train's ring gear rotates clockwise.
The front planetary train's planetary gear rotates clockwise on its shafts. Because the front planetary train's sun gear is locked by the oil pump, the planetary train's planetary gear presses against the front planetary train's ring gear, and therefore rotates around the sun gear. Because the front planetary train's ring gear has inner teeth, the direction of rotation does not change.
The front planetary gear carrier rotates clockwise.
Clutch C1 rotates clockwise and connects the front planetary gear carrier with the rear planetary train's small sun gear.
Rear planetary train's sun gear rotates clockwise.
The rear planetary train's inner planetary gear rotates counter-clockwise on its shaft. The rear planetary gear carrier attempts to rotate counter-clockwise but is prevented by freewheel F1.
The rear planetary train's outer planetary gear rotates clockwise on its shafts. The rear planetary train's small sun gear rotates counter-clockwise, at idle.
The rear planetary train's ring gear rotates clockwise using the rear planetary train's outer planetary gear. Because the rear planetary train's ring gear has inner teeth, the direction of rotation does not change.
The driven gear rotates clockwise. Because the rear planetary train's ring gear is on the driven gear, the driven gear rotates in the same direction as the rear planetary train's ring gear.
The counter-rotating gear rotates counter-clockwise.
The differential's ring gear rotates clockwise.
Position D, 2nd gear
Scheme 1408
| Solenoid | Clutch | Brakes | Freewheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SLC1 | SLC 2 | SLC 3 | SLB1 | S1 | S2 | C1 | C2 | C3 | B1 | B2 | F1 |
| X | X | X | X | ||||||||
X = activated
= not activated
| Planetary train unit | Power in | Locked | Power out |
|---|---|---|---|
| Front | Ring gear | Sun gear | Planetary gear carrier |
| Rear | Small sun gear | Large sun gear | Ring gear |
The input shaft rotates clockwise, the same direction as the torque converter's turbine rotor.
The front planetary train's ring gear rotates clockwise.
The front planetary train's planetary gear rotates clockwise on its shafts. Because the front planetary train's sun gear is locked by the oil pump, the planetary train's planetary gear presses against the front planetary train's ring gear, and therefore rotates around the sun gear. Because the front planetary train's ring gear has inner teeth, the direction of rotation does not change.
The front planetary gear carrier rotates clockwise.
Clutch C1 rotates clockwise and connects the front planetary gear carrier with the rear planetary train's small sun gear.
Rear planetary train's sun gear rotates clockwise.
The rear planetary train's large sun gear is locked by brake B1.
The rear planetary train's inner planetary gear rotates counter-clockwise on its shaft.
The rear planetary train's outer planetary gear rotates clockwise on its shafts.
The rear planetary train's ring gear rotates clockwise using the rear planetary train's outer planetary gear. Because the rear planetary train's ring gear has inner teeth, the direction of rotation does not change.
The driven gear rotates clockwise. Because the rear planetary train's ring gear is on the driven gear, the driven gear rotates in the same direction as the rear planetary train's ring gear.
The counter-rotating gear rotates counter-clockwise.
The differential's ring gear rotates clockwise.
Engine brake
When the engine brake works, the driven force is transferred from the tires.
Position D, 3rd gear
Scheme 1409
| Solenoid | Clutch | Brakes | Freewheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SLC1 | SLC 2 | SLC 3 | SLB1 | S1 | S2 | C1 | C2 | C3 | B1 | B2 | F1 |
| X | X | X | X | ||||||||
X = activated
= not activated
| Planetary train unit | Power in | Locked | Power out |
|---|---|---|---|
| Front | Ring gear | Sun gear | Planetary gear carrier |
| Rear | Small sun gear and large sun gear | No component | Ring gear |
The input shaft rotates clockwise, the same direction as the torque converter's turbine rotor.
The front planetary train's ring gear rotates clockwise.
The front planetary train's planetary gear rotates clockwise on its shafts. Because the front planetary train's sun gear is locked by the oil pump, the planetary train's planetary gear presses against the front planetary train's ring gear, and therefore rotates around the sun gear. Because the front planetary train's ring gear has inner teeth, the direction of rotation does not change.
The front planetary gear carrier rotates clockwise.
Clutch C1 rotates clockwise and connects the front planetary gear carrier with the rear planetary train's small sun gear.
Clutch C3 rotates clockwise and connects the front planetary gear carrier with the rear planetary train's large sun gear.
The rear planetary train rotates clockwise. Because the rear planetary train's inner and outer planetary gears are in constant engagement with each other, they are kinetically locked in relation to each other. The kinetic energy from both the rear planetary train's sun gears is therefore transferred to the rear planetary train's ring gear.
The rear planetary train's ring gear rotates clockwise.
The driven gear rotates clockwise. Because the rear planetary train's ring gear is on the driven gear, the driven gear rotates in the same direction as the rear planetary train's ring gear.
The counter-rotating gear rotates counter-clockwise.
The differential's ring gear rotates clockwise.
Engine brake
When the engine brake works, the driven force is transferred from the tires.
Position D, 4th gear
Scheme 1410
| Solenoid | Clutch | Brakes | Freewheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SLC1 | SLC 2 | SLC 3 | SLB1 | S1 | S2 | C1 | C2 | C3 | B1 | B2 | F1 |
| X | X | X | X | ||||||||
X = activated
= not activated
| Planetary train unit | Power in | Locked | Power out |
|---|---|---|---|
| Front | Ring gear | Sun gear | Planetary gear carrier |
| Rear | Small sun gear and planetary gear carrier | No component | Ring gear |
The input shaft rotates clockwise, the same direction as the torque converter's turbine rotor.
The front planetary train's ring gear rotates clockwise.
The front planetary train's planetary gear rotates clockwise on its shafts. Because the front planetary train's sun gear is locked by the oil pump, the planetary train's planetary gear presses against the front planetary train's ring gear, and therefore rotates around the sun gear. Because the front planetary train's ring gear has inner teeth, the direction of rotation does not change.
The front planetary gear carrier rotates clockwise.
Clutch C1 rotates clockwise and connects the front planetary gear carrier with the rear planetary train's small sun gear.
The intermediate shaft rotates clockwise, the same direction as the input shaft.
Clutch C2 rotates clockwise.
The rear planetary gear carrier rotates clockwise.
The rear planetary train's inner planetary gear rotates clockwise on its shafts.
The rear planetary train's outer planetary gear rotates counter-clockwise on its shafts.
The rear planetary train's ring gear rotates clockwise. Because the rear planetary train's outer planetary gear rotation pulls away from the rear planetary gear carrier's rotation, the ring gear's speed is lower than the speed at the planetary carrier.
The driven gear rotates clockwise. Because the rear planetary train's ring gear is on the driven gear, the driven gear rotates in the same direction as the rear planetary train's ring gear.
The counter-rotating gear rotates counter-clockwise.
The differential's ring gear rotates clockwise.
Engine brake
When the engine brake works, the driven force is transferred from the tires.
Position D, 5th gear
Scheme 1411
| Solenoid | Clutch | Brakes | Freewheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SLC1 | SLC 2 | SLC 3 | SLB1 | S1 | S2 | C1 | C2 | C3 | B1 | B2 | F1 |
| X | X | X | X | ||||||||
X = activated
= not activated
| Planetary train unit | Power in | Locked | Power out |
|---|---|---|---|
| Front | Ring gear | Sun gear | Planetary gear carrier |
| Rear | Large sun gear and planetary gear carrier | No component | Ring gear |
The input shaft rotates clockwise, the same direction as the torque converter's turbine rotor.
The front planetary train's ring gear rotates clockwise.
The front planetary train's planetary gear rotates clockwise on its shafts. Because the front planetary train's sun gear is locked by the oil pump, the planetary train's planetary gear presses against the front planetary train's ring gear, and therefore rotates around the sun gear. Because the front planetary train's ring gear has inner teeth, the direction of rotation does not change.
The front planetary gear carrier rotates clockwise.
Clutch C3 rotates clockwise and connects the front planetary gear carrier with the rear planetary train's large sun gear.
The rear planetary train's large sun gear rotated clockwise. Its speed is reduced by the front planetary train so that the speed becomes lower than the speed of the input shaft.
The intermediate shaft rotates clockwise, the same direction as the input shaft.
Clutch C2 rotates clockwise.
The rear planetary gear carrier rotates clockwise.
The rear planetary train's outer planetary gear rotates clockwise. Because the rear planetary gear carrier rotates faster than the rear planetary train's large sun gear, the inner planetary gears are pressed outwards by the speed difference and rotate clockwise on their shafts.
The rear planetary train's ring gear rotates clockwise. Because the rear planetary train's outer planetary gear rotation is added to the rear planetary gear carrier's rotation, the ring gear's speed is greater than the speed at the planetary carrier.
The driven gear rotates clockwise. Because the rear planetary train's ring gear is on the driven gear, the driven gear rotates in the same direction as the rear planetary train's ring gear.
The counter-rotating gear rotates counter-clockwise.
The differential's ring gear rotates clockwise.
Engine brake
When the engine brake works, the driven force is transferred from the tires.
Position D, 6th gear
Scheme 1412
| Solenoid | Clutch | Brakes | Freewheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SLC1 | SLC 2 | SLC 3 | SLB1 | S1 | S2 | C1 | C2 | C3 | B1 | B2 | F1 |
| X | X | X | X | ||||||||
X = activated
= not activated
| Planetary train unit | Power in | Locked | Power out |
|---|---|---|---|
| Front | No component | No component | No component |
| Rear | Planetary gear carrier | Large sun gear | Ring gear |
The input shaft rotates clockwise, the same direction as the torque converter's turbine rotor.
The intermediate shaft rotates clockwise, the same direction as the torque converter's turbine rotor
Brake B1 locks the rear planetary train's large sun gear.
Clutch C2 connects the intermediate shaft with the rear planetary gear carrier.
The rear planetary gear carrier rotates clockwise.
The rear planetary train's outer planetary gear rotates clockwise on its shafts. Because the rear planetary train's large sun gear is locked, the planetary train's outer planetary gear can always increase the speed.
The rear planetary train's ring gear rotates clockwise. Because the rear planetary train's outer planetary gear rotation is added to the rear planetary gear carrier's rotation, the ring gear's speed is greater than the speed at the planetary carrier.
The driven gear rotates clockwise. Because the rear planetary train's ring gear is on the driven gear, the driven gear rotates in the same direction as the rear planetary train's ring gear.
The counter-rotating gear rotates counter-clockwise.
The differential's ring gear rotates clockwise.
Engine brake
When the engine brake works, the driven force is transferred from the tires.
Position R, reverse gear
Scheme 1413
| Speed | Solenoid | Clutch | Brakes | Freewheel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SLC1 | SLC 2 | SLC 3 | SLB1 | S1 | S2 | C1 | C2 | C3 | B1 | B2 | F1 | |
| Max 7 km/h | X | X | X | X | X | X | ||||||
| Above 7 km/h | X | X | X | X | X | X | ||||||
X = activated
= not activated
| Planetary train unit | Power in | Locked | Power out |
|---|---|---|---|
| Front | Ring gear | Sun gear | Planetary gear carrier |
| Rear | Large sun gear | Planetary gear carrier | Ring gear |
The input shaft rotates clockwise, the same direction as the torque converter's turbine rotor.
The front planetary train's ring gear rotates clockwise.
The front planetary train's planetary gear rotates clockwise on its shafts. Because the front planetary train's sun gear is locked by the oil pump, the planetary train's planetary gear presses against the front planetary train's ring gear, and therefore rotates around the sun gear. Because the front planetary train's ring gear has inner teeth, the direction of rotation does not change.
The front planetary gear carrier rotates clockwise.
Clutch C3 rotates clockwise and connects the front planetary gear carrier with the rear planetary train's large sun gear.
The rear planetary train's large sun gear rotates clockwise.
Brake B2 locks the rear planetary gear carrier.
The rear planetary train's outer planetary gear rotates counter-clockwise.
The rear planetary train's ring gear rotates counter-clockwise using the rear planetary train's outer planetary gear. Because the rear planetary train's ring gear has inner teeth, the direction of rotation does not change.
The driven gear rotates counter-clockwise. Because the rear planetary train's ring gear is on the driven gear, the driven gear rotates in the same direction as the rear planetary train's ring gear.
The counter-rotating gear rotates clockwise.
The differential's ring gear rotates counter-clockwise.
Engine brake
When the engine brake works, the driven force is transferred from the tires.
Scheme 1414
The differential consists of the differential housing, large and small differential gears, shaft journals and thrust washers. The differential housing is completely sealed so that if a drive shaft is removed no dirt can penetrate and no oil can run out.
The differential distributes power equally between the drive wheels, even if they are rotating at different speeds. When driving straight ahead, the ring gear and differential housing rotate at the same speed as the drive shafts and the driving wheels. When cornering, the differential gears rotate to compensate for the different speeds of the wheels. Because the small differential gears are rotating on the shaft journal, the drive shafts can rotate at different speeds. Power is transferred from the differential housing to the drive shafts via the small differential gears in the same way as when driving straight ahead. Both drive wheels still have the same driven power.
AWD
Cars with four wheel drive have a splined pin on the differential housing. The sleeve on the pin connects the differential housing with the bevel gear. This transfers the power to the rear wheels.
Scheme 1415
Scheme 1416
A. Model number ( T ransverse F wd, S lipping lock-up, integrated C omputer)
B. Serial number
- Production year (04 indicates 2004)
- Production month (C indicates March)
- Transmission model (38 indicates TF-80SC)
- Sequence number
| A | B | C | D | E | F | G | H | J | K | L | M | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Scheme 1417
HINT: The shape of the transmission casing differs depending on which engine is included in the driveline.
This transmission has been updated on several points to meet high demands for fuel economy and comfort. TF80SC Gen 2 replaces earlier versions of TF80SC.
Changes compared to earlier version
- Solenoids
- tapered bearings
- friction pads
- Seals
- oil with lower viscosity
- "lock-up" at lower engine rpm
- software in TCM ( T ransmission C ontrol M odule)
- fastening AC bracket (6-cyl. engines)
These changes contribute to lower internal losses and, together with upshifting at lower engine rpms, faster downshifts, the result is lower fuel consumption, better shifting quality, and higher efficiency.
TF-80SL (TF-80SL AWD) is an electronically controlled 6-speed automatic transmission with Geartronic.
The Geartronic function combines two transmissions in one. One adaptive 6-gear automatic transmission which enables relaxed driving, and a "manually" shifted transmission which enables more active driving with manual shifting. In case of manual shifting, the gear selector is pushed forward to upshift to a higher gear and it's pulled back to downshift to a lower gear. However, in certain situations the Transmission control module (TCM) assumes the gearshifting decisions
TF-80SL has a lock-up-function on all forward gears except 1st gear. The torque converter has a locked and slipping lock-up-function.
Gearshifts are controlled by an hydraulic operating system. Gearshifts take place without freewheeling and completely automatically in terms of load and speed.
TF-80SL has two planetary gear units, a front and a rear, whose shifts are controlled by a number of clutches and brakes. The rear planetary gear is of the Ravigneaux type.
The oil level is checked by level pipe (the transmission does not have a conventional dipstick).
The transmission has a total of 8 solenoids that control the hydraulic flow. 6 of these solenoids control the shift process, 1 solenoid controls the torque converter's lock-up function and 1 solenoid controls the system pressure.
The gear selector sensor is integrated in the Transmission control module (TCM). The Transmission control module (TCM) is integrated in the transmission.
see DESIGN AND FUNCTION