2008 SUZUKI SWIFT clutch

Downloaded from www.Manualslib.com manuals search engine Automatic Transmission/Transaxle: 5A-3
General Description
A/T DescriptionS7RS0B5101001
This automatic transaxle is electronic control full automatic transaxle with forward 4-speed and reverse 1-speed.
The torque converter is a 3-element, 1-step and 2-phase type and is equipped with an automatically controlled lock-up
mechanism.
The gear change device consists of a ravigneau type planet ary gear unit, 3 multiple disc type clutches, 3 multiple disc
type brakes and 2 one-way clutches.
The hydraulic pressure control device consists of a valve body assembly, pressure control solenoid valve (linear
solenoid), 2 shift solenoid va lves, TCC pressure control solenoid valve (lin ear solenoid) and a timing solenoid valve.
Optimum line pressure complying with engine torque is produced by the pressure control solenoid valve in
dependence upon control signal from transmission control module (TCM). This makes it possible to control the line
pressure with high accuracy in accordance with the engine power and running conditions to achieve smooth shifting
characteristics and high efficiency.
A clutch-to-clutch control system is prov ided for shifting between 3rd gear and 4th gear. This clutch-to-clutch control
system is made to function optimally , so that hydraulic pressure controls such as shown below are conducted.
• When upshifting from 3rd gear to 4th gear, to adjust the drain hydraulic pressure at releasing the forward clutch, a
timing solenoid valve is used to switch a hydraulic passage with an orifice to another during shifting.
• When downshifting from 4th gear to 3rd gear, to adjust the line pressure applied to the forward clutch at engaging the forward clutch, a timing solenoid valve is used to s witch a hydraulic passage with an orifice to another during
shifting.
• When upshifting from 3rd gear to 4th gear with engine throttle opened, to optimize the line pressure applied to the forward clutch at releasing the forward clutch, the learning control is processed to compensate the switching timing
of the timing solenoid at every shifting.
• When downshifting from 4th gear to 3rd gear with engine throttle opened, to optimize the line pressure applied to
the forward clutch at engaging the forw ard clutch, the learning control is processed to compensate the line pressure
at every shifting.
Employing the ravigneau type planetary gear unit and this clutch-to-clutch control system greatly simplifies the
construction to make possible a lightweight and compact transaxle.
A line pressure learning control is conducted to provide opti mum shifting time at every upshifting with engine throttle
opened. If long upshifting time is detected, the subsequent line pressure applied during upshifting is intensified. On the
contrary, if short upshifting time is detected, the subs equent line pressure applied during upshifting is weakened.
Slip controlled lock-up function
Even at a lower speed than when the TCC gets engaged completely, control over the TCC pressure control solenoid
works to cause the TCC to slip (be engaged slightly), ther eby improving the transmission efficiency. While such slip
control is being executed, the oil pressure applied to the TCC is controlled by the TCC pressure control solenoid so
that the difference between the engine speed and the input shaft speed becomes close to the specified value.
Also, during deceleration, the TCC is made to slip (be enga ged slightly) to raise the engine speed and enlarge the fuel
cut operation range so that better fuel consumption is achieved.
Due to this reason, it is absolutely necessary for the automati c transmission to use ATF suitable for slip control. Use of
any fluid other than the specified ATF may cause j uddering or some other faulty condition to occur.

Downloaded from www.Manualslib.com manuals search engine 5A-4 Automatic Transmission/Transaxle:
1
2
3
4567891011121314151617
18 19 20 21 22 23
24 25
26
27
28I3RM0B510001-01
1. Drive plate 11. 1st and reverse brake 21. Rear sun gear
2. Torque converter clutch (TCC) 12. Ring gear22. Front sun gear
3. Torque converter 13. Long planet pinion23. Short planet pinion
4. Input shaft 14. One-way No.2 clutch 24. Countershaft
5. Oil pump 15. 2nd brake25. Reduction driven gear
6. Direct clutch drum (double as sensor ro tor for input shaft speed sensor) 16. One-way No.1 clutch 26. Differential case assembly
7. Direct clutch 17. O/D and 2nd coast brake 27. Final gear
8. Parking lock gear 18. Intermediate shaft28.Output shaft speed sensor drive gear
9. Reduction drive gear 19. Forward clutch
10. Planet carrier 20. Reverse clutch

Downloaded from www.Manualslib.com manuals search engine Automatic Transmission/Transaxle: 5A-5
SpecificationsItem Specifications
Torque converter Ty p e
Stall torque ratio 3-element, 1-step, 2-phase type (with TCC (lock-up)
mechanism)
2.0 – 2.2
Oil pump Ty p e
Drive system Internal involute gear type oil pump (non crescent type)
Engine driven
Gear change
device Type Forward 4-step, reverse 1-step planetary gear type
Shift position
“P” range Gear in neutral, output shaft fixed, engine start
“R” range Reverse
“N” range Gear in neutral, engine start
“D” range
Forward 1st
↔ 2nd ↔ 3rd ↔ 4th automatic gear
change
“3” range Forward 1st
↔ 2nd ↔ 3rd ← 4th automatic gear
change
“2” range Forward 1st ↔ 2nd ← 3rd automatic gear change
“L” range Forward 1st
← 2nd ← 3rd reduction, and fixed at 1st
gear
Gear
ratio 1st 2.875 Number of teeth Front sun gear: 24
2nd 1.568 Rear sun gear: 30
3rd 1.000 Long planet pinion: 20
4th (overdrive gear) 0.697 Short planet pinion: 19
Reverse (reverse gear) 2.300 Ring gear: 69
Control elements Wet type multiple-disc clutch... 3 sets
Wet type multiple-d
isc brake... 3 sets
One-way clutch... 2 sets
Reduction gear ratio 1.023
Final gear reduction ratio 4.277
Lubrication Lubrication system Force feed system by oil pump
Cooling Cooling system Radiator assisted cooling (water-cooled)
Fluid used SUZUKI ATF 3317 or Mobil ATF 3309

Downloaded from www.Manualslib.com manuals search engine 5A-6 Automatic Transmission/Transaxle:
Clutch / Brake / Planetary Gear Function of Automatic TransaxleS7RS0B5101002
Functions
12
4
3 5
6
7
89
10 11
12 13
14 15 16
17
18
19
I4RS0A510001-01
1. Input shaft and intermediate shaft 6. Long planet pi nion 11. O/D and 2nd coast brake 16. Rear sun gear
2. Direct clutch 7. 1st and reverse brak e 12. Reverse clutch 17. Final drive gear
3. Reduction drive gear 8. One-way No.2 clutch 13. Forward clutch 18. Reduction driven gear
4. Planet carrier 9. 2nd brake 14. Ring gear 19. Final driven gear
5. Short planet pinion 10. One-way No.1 clutch 15. Front sun gear
Part name Function
Forward clutch Meshes intermediate shaft and front sun gear Direct clutch Meshes input shaft and planet carrier
Reverse clutch Meshes intermediate shaft and rear sun gear
O/D and 2nd coast brake Fixes rear sun gear 2nd brake Fixes rear sun gear
1st and reverse brake Fixes planet carrier One-way No.1 clutch Prevents rear sun gear from turning counterclockwise
One-way No.2 clutch Prevents planet ca rrier from turning counterclockwise

Downloaded from www.Manualslib.com manuals search engine Automatic Transmission/Transaxle: 5A-7
Table of Component OperationS7RS0B5101003
{: ON
×: OFF
U : ON only when TCC is operating
Selector
position Gear
position Part
Shift solenoid
valve-A (No.1) Shift solenoid
valve-B (No.2) TCC solenoid
valve Forward
clutch Direct clutch Reverse
clutch
PParking {{ × ×××
R Reverse {{ ××× {
N Neutral {{ × ×××
D 1st
{{ ×{ ××
2nd { ×× {××
3rd ×× U{{ ×
4th × { U ×{ ×
2 1st
{{ ×{ ××
2nd { ×× {××
L1st {{ ×{ ××
Selector
position Gear
position Part
O/D and 2nd coast brake 2nd brake 1st and
reverse brake One-way No.1
clutch One-way No.2
clutch
PParking ×××××
R Reverse ×× {××
N Neutral ×××××
D 1st
×××× {
2nd × { ×{ ×
3rd × { ×××
4th {{ ×××
2 1st
×××× {
2nd {{ ×{ ×
L1st ×× {×{

Downloaded from www.Manualslib.com manuals search engine Automatic Transmission/Transaxle: 5A-9
CAN Communication System DescriptionS7RS0B5101007
Refer to “CAN Communication System Description in Section 1A” for CAN communication System description. TCM
communicates control data with each control module as follows.
TCM Transmission Data
TCM Reception Data
DATA
TCM
Transmit
Transmission oil temperarure
signal
Torque request signal
Vehicle speed pulse signal
Transmission warning light
signal
Transmission actual gear position
signal
A/T select lever position signal
ECMCombination
meterBCM
I7RS0B510001-03
Engine torque signal
Engine speed signal
Throttle position signal
A/C compressor clutch signal
Engine coolant temperature signal
Brake pedal switch signal
Reception data from ECM
Accelerator pedal position signalI7RS0B510002-03

Downloaded from www.Manualslib.com manuals search engine 5A-12 Automatic Transmission/Transaxle:
Automatic Gear Shift TableS7RS0B5102002
Automatic gear shift schedule is shown in the following table. Test-drive the vehicle on a flat road in the D, 3, 2
position.
1. Shift Point in D, 3 or 2 position
2. Lock-up point in D or 3 position
3. Slip lock-up point in D or 3 position Throttle opening (%) Shift Vehicle speed km/h (mph) Remark
UP shift Over 85%
1st →
2nd 43 – 48 (27 – 30) D, 3, 2 range
2nd → 3rd 91 – 96 (57 – 60) D, 3 range
3rd → 4th 154 – 159 (96 – 99) D range
50% 1st →
2nd 36 – 41 (22 – 25) D, 3, 2 range
2nd → 3rd 64 – 69 (40 – 43) D, 3 range
3rd → 4th 95 – 100 (59 – 62) D range
10% 1st →
2nd 14 – 19 (9 – 12) D, 3, 2 range
2nd → 3rd 31 – 36 (19 – 22) D, 3 range
3rd → 4th 46 – 51 (29 – 32) D range
DOWN shift Over 90%
4th
→ 3rd 151 – 156 (94 – 97) D range
3rd → 2nd 81 – 86 (50 – 53) D, 3 range
2nd → 1st 31 – 36 (19 – 22) D, 3, 2 range
50% 4th
→ 3rd 51 – 56 (32 – 35) D range
3rd → 2nd 25 – 30 (16 – 19) D, 3 range
2nd → 1st 8 – 13 (5 – 8) D, 3, 2 range
0% 4th
→ 3rd 27 – 32 (17 – 20) D range
3rd → 2nd 16 – 21 (10 – 13) D, 3 range
2nd → 1st 8 – 13 (5 – 8) D, 3, 2 range
Lock-up
clutch status Throttle
opening (%) Vehicle speed km/h (mph) Remark
3rd gear lock-up ON
Over 90% 125 – 130 (78 – 81) D, 3 range
50% 95 – 100 (59 – 62) D, 3 range
OFF Over 95% 103 – 108 (64 – 67) D, 3 range
50% 66 – 71 (41 – 44) D, 3 range
4th gear lock-up ON
Over 90% 154 – 159 (96 – 99) D range
50% 145 – 150 (90 – 93) D range
OFF Over 95% 151 – 156 (94 – 97) D range
50% 114 – 119 (71 – 74) D range
Slip Lock-up
clutch status Throttle
opening (%) Vehicle speed km/h (mph) Remark
2nd gear Slip ON 15% 34 – 39 (21 – 24) • D, 3 range
• Without lock-up condition
Slip OFF 15% 19 – 24 (12 – 15)
3rd gear Slip ON 15% 34 – 39 (21 – 24) • D, 3 range
• Without lock-up condition
Slip OFF 15% 31 – 36 (19 – 22)
4th gear Slip ON 15% 51 – 56 (32 – 35) • D range
• Without lock-up condition
Slip OFF 15% 46 – 51 (29 – 32)

Downloaded from www.Manualslib.com manuals search engine 5A-14 Automatic Transmission/Transaxle:
6. Output shaft speed sensor 13. Shift solenoid valve-A (No.1) 20. Transmission warning light
7. Input shaft speed sensor 14. Transmission range sensor
INPUT OUTPUT
TCMECM
Gear shift control
4th gear inhibit control
Slope shift control
Slip control
Lock up control
Torque control
Line pressure control
Overrun control
Reverse control
Squat control
Input shaft speed sensor
Output shaft speed sensor
"3" position switch ATF temp. sensor
Shift switch
- Range "P" signal
- Range "R" signal
- Range "N" signal
- Range "D" signal
- Range "2" signal
- Range "L" signal
Fail safe function
Self diagnosis
Warning function
ECM
Shift solenoid valve-A
Shift solenoid valve-B
TCC pressure control
solenoid valve
Pressure control
solenoid valve
Signal on CAN
communincation line
COMB. METER
-Engine torque
-Engine speed
-Throttle position
-A/C compressor clutch
-Coolant temperature
-Brake pedal switch -ATF temp.
-Torque request
-Vehicle speed pulse
-Transmission actual gear
position
-A/T select lever position
-Accelerator pedal position
-Transmission warning light
-A/T select lever position
I7RS0B510005-01