2000 SUZUKI SWIFT Gear shift

AUTOMATIC TRANSMISSION (4 A/T) 7B-3
GENERAL DESCRIPTION
This automatic transmission is a full automatic type with 3-speed plus overdrive (O/D).
The torque converter is a 3-element, 1-step and 2-phase type equipped with lock-up mechanism. The gear shift
device consists of 2 sets of planetary gear units, sets of 3 disc type clutches, 3sets of disc type brakes and one-
way clutch. The gear shift is done by selecting one of 6 positions (“P”, “R”, “N”, “D”, “2” and “L”) by means of the
select lever installed on the floor. On the shift knob, there is an overdrive (O/D) cut switch which allows shift-up
to the overdrive mode and shift-down from the overdrive mode.
1. Final gear 6. Overdrive brake (B0) 11. Oil strainer 16. Front clutch (C2)
2. Differential gear assembly 7. Direct clutch (C0) 12. Counter drive gear (Reduction gear) 17. Reverse brake (B2)
3. Parking gear 8. Rear planetary gear 13. Oil pump 18. Rear clutch (C1)
4. Counter driven gear (Reduction gear) 9. Front planetary gear 14. Input shaft 19. Differential drive pinion shaft
5. 1st and 2nd brake (B1) 10. Valve body assembly 15. Torque converter

7B-4 AUTOMATIC TRANSMISSION (4 A/T)
Item Specifications
Torque
converterType
Stall torque ratio3-element, 1-step, 2-phase type
1.65 –1.85
Oil pumpType
Drive systemInternal gear type oil pump
Engine driven
Gear
change
deviceType 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
(O/D ON)Forward 1st ↔
2nd ↔
3rd ↔
4th (O/D)
automatic gear change
“D” range
(O/D OFF)Forward 1st ↔
2nd ↔
3rd ←
4th
automatic gear change
“2” range Forward 1st ↔
2nd ←
3rd automatic gear change
“L” range Forward 1st ←
2nd reduction, and fixed at 1st gear
Gear
ratio1st 2.962
2nd 1.515 Number of teeth Front sun gear : 34
Rear sun gear : 21
Front pinion gear : 16
Rear pinion gear : 19
Front internal gear : 66
Rear internal gear : 59 3rd 1.000
4th
(overdrive gear)0.737
Reverse
(reverse gear2.809
Control elementsWet type multi-disc clutch ... 3 sets
One-way clutch ... 1 set
Wet type multi-disc brake ... 3 sets
Reduction gear ratio 1.209
Final gear ratio
(Differential)3.578 (for 2WD vehicle), 3.894 (for 4WD vehicle)
Lubrication Lubrication system Force feed system by oil pump
Cooling Cooling system Water-cooled
Fluid used
Equivalent of DEXRON
-III or DEXRON-IIE

AUTOMATIC TRANSMISSION (4 A/T) 7B-5
FUNCTIONS
TABLE OF COMPONENT OPERATION
TABLE OF SHIFT SOLENOID VALVE OPERATION
NOTE:
For operation of each part, refer to TABLE OF COMPONENT OPERATION.
PART NAME FUNCTION
Rear clutch Meshes input shaft and rear sun gear through one-way clutch.
Front clutch Meshes input shaft and front internal gear and rear carrier.
Overdrive brake Fixes rear sun gear.
1st & 2nd brake Fixes front sun gear.
Reverse brake Fixes front internal gear and rear carrier.
Direct clutch Meshes input shaft and rear sun gear.
Selector
positionGear
positionPar t
P
R
N
1st
2nd
3rd
4th(O/D)
1st
2nd
1st D
2
LRear
clutchFront
clutchOverdrive
brake1st & 2nd
brakeReverse
brakeDirect
clutchOne-way
clutch
:Operating:Not operating
:Operating:Not operating Range & Gear
P, N
R
D, 21st gear of,
L
1st gear of
2nd gear
3rd gear
4th gearShift Solenoid Valve
A (No.1) B (No.2) C (No.3) D (No.4) E (No.5)

AUTOMATIC TRANSMISSION (4 A/T) 7B-7
TRANSMISSION CONTROL MODULE (TCM)
TCM is an electronic circuit component that controls gear shift, idle-up according to the signal from each sensor.
Also it has learning control function for performing optimum control. It is a microcomputer consisting of an IC,
transistor, diode, etc. It is installed behind glove box.
1.“O/D OFF” lamp (in combination meter) 11. Backup lamp 21. Dropping resistor
2.“O/D” off switch 12. Shift indicator (if equipped) 22. Output shaft speed sensor (A/T VSS)
3. Monitor connector No.2 13. A/T 23. Input shaft speed sensor (Turbine rev. sensor)
4. Brake lamp 14. Transmission temperature sensor
(A/T fluid temp. sensor)24. A/T power source relay
5. Brake lamp switch 15. Shift solenoid-A (Shift solenoid No.1) 25. Ignition switch
6. ECM 16. Shift solenoid-B (Shift solenoid No.2) 26. DLC
7. A/C clutch 17. Shift solenoid-C (Shift solenoid No.3) 27. Barometric pressure sensor
8. Transmission range sensor (Shift switch) 18. Shift solenoid-D (Shift solenoid No.4) 28. Solenoid power relay
9. Shift lock solenoid switch (if equipped) 19. Shift solenoid-E (Shift solenoid No.5) 29. Terminal arrangement of TCM coupler
(Viewed from harness side)
10. Shift lock solenoid (if equipped) 20. TCC solenoid (Lock-up solenoid)
C41-14
C41-21
C42-5
C41-23
G02-16
BLKBLKLT GRN/ RED/BLU BLU/ORN
PPL/YEL
3
45
+BB
GRN/WHT
LT BLU
PPL
WHT/BLK
BLK/WHT
BRN
PNK/BLK 6
7
8
C44-8
C43-8
C44-18
C44-20
C43-5
C44-5
910
ORN
RED
GRN/ORN RED/BLK
GRNC43-1
C43-2
C43-3
C43-9
C43-10
C43-11 GRN/YEL
BLU/WHT P
R
N
D
2
L11
12C44-21
C44-17
C43-4
C44-4
12V 12V
12V
12V
12V IG1
IG115V
5VC44-3
C44-16
C44-10
C44-23
C44-24
C44-25
C44-26
C44-22
C44-11
C44-12
C44-13
C43-6
C43-14
C43-13
C43-7
C43-15
C44-2
C44-15
C43-12
BLU BLUBLK
BLK BLK
BLU/YEL
YEL/BLK RED/WHT WHT BLU/ORN RED/BLU GRY/BLU
BLK/YEL WHT/BLU
BRN/WHT BRN/WHT BRN WHT/RED
BLK/YEL
BRN/YEL BLU/RED
GRY/RED13
14
15
16
17
19
20 BRN
21
22
23
+BB 24
25
26
12V
12V
12V
12V
18
12V
IG1
IG11
5V
1
2
28
27

7B-8 AUTOMATIC TRANSMISSION (4 A/T)
FAIL SAFE FUNCTION
This function is provided by the safe mechanism that assures safe driveability even when the solenoid valve,
sensor or its circuit fails.
The table below shows the fail safe function for each fail condition of sensor, solenoid or its circuit.
Area Detecting condition Fail safe function
Input/Turbine
speed sensor cir-
cuit
(DTC P0715)Input shaft speed
sensor signal voltage
is too high or too low.When vehicle running and in shift change by automatic elec-
tronic control, gear is fixed to gear which is going to be
selected and lock-up function is turned OFF.
When vehicle running and in no shift change, gear is fixed to
gear right before the trouble occurred and lock-up function is
turned OFF.
When vehicle is at stop after or during detecting trouble, or in
shift change by manual operation while running, gear is fixed
as the followings and lock-up function is turned OFF.
“P” range →
P, “R” range →
R, “N” range →
N,
“D” range →
3rd, “2” range →
2nd, “L” range →
1st Output shaft speed
sensor circuit
(DTC P0720)Output shaft speed
sensor signal voltage
is too high or too low.
Shift solenoid
(DTC P0753)
(DTC P0758)
(DTC P0763)
(DTC P0768)
(DTC P0773)Solenoid output
voltage is too high
although TCM
orders solenoid to
turn off.
Solenoid output
voltage is too low
although TCM
orders solenoid to
turn on.When select lever is “P”, “R”, “N”, “D” or “2” range, A/T sole-
noid power relay is turned OFF and gear is fixed as follows :
“P” range →
P, “R” range →
R, “N” range →
N,
“D” range →
3rd
When select lever is “2” range, gear is fixed to pre pro-
grammed gear position of several patterns as follows :
–Malfunction of No.1 solenoid →
3rd
–Malfunction of No.2 solenoid →
3rd
–Malfunction of No.3 solenoid →
2nd
–Malfunction of No.4 solenoid →
1st or 2nd
–Malfunction of No.5 solenoid →
2nd or 3rd
–Malfunction of 2 or more solenoids →
3rd
When select lever is “L” range, gear is fixed to pre pro-
grammed gear position of several patterns as follows :
–Malfunction of No.1 solenoid →
3rd
–Malfunction of No.2 solenoid →
1st
–Malfunction of No.3 solenoid →
2nd
–Malfunction of No.4 solenoid →
1st or 2nd
–Malfunction of No.5 solenoid →
1st
–Malfunction of 2 or more solenoids →
3rd
TCC circuit
(DTC P0743)Lock-up function is turned OFF.

AUTOMATIC TRANSMISSION (4 A/T) 7B-9
A/T hardware itself
(DTC P0730)Difference in detected
revolution between
input shaft speed
sensor and output
shaft speed sensor is
too wide.“P” range →
P, “R” range →
R, “N” range →
N,
“D”/“2”/“L” range “To be controlled as follows :
1) When detecting trouble at first, gear is selected well-suited
gear calculated with parameters of each sensor’s rev. num-
ber and gear position just when the trouble occurred. Lock-
up function is turned OFF.
2) If A/T can transmit driving force under the above condition,
gear is fixed the selected gear until ignition switch is turned
OFF.
3) If A/T can not transmit driving force under the above condi-
tion, after once vehicle stop, gear which can transmit drive
force is searched one by one until gear is found out. After
gear is found out, position of gear is held until ignition switch
is turned OFF.
Transmission
range sensor cir-
cuit
(DTC P0705)No shift switch signal
is inputted or two or
more shift switch sig-
nals are inputted at
the same time.When vehicle running, shift range position is fixed to shift
range position right before the trouble occurred until vehicle
stop and lock-up function is turned OFF.
When vehicle is at stop after or during detecting the trouble,
gear is fixed as the followings and lock-up function is turned
OFF.
–When 2 adjoining gear position signals are inputted.
“P”, “R” range →
R, “R”, “N” range →
R,
“N”, “D” range →
D, “D”, “2” range →
D,
“2”, “L” range →
2nd
–When 2 or more signals excepting above or no signal are
inputted.
“P” range →
P, “R” range →
R,
“N” range →
N, “D”/“2”/“L” range →
3rd
Transmission tem-
perature sensor cir-
cuit
(DTC P0710)A/T fluid temp. sig-
nal input voltage is
too low.
A/T fluid temp. sig-
nal input voltage
does not go down
although standard
value of engine
rev. signal is input-
ted.When detecting circuit open, TCM control as fluid tempera-
ture is 100°C (212°F).
Lock-up function is turned OFF.
Engine speed input
circuit
(DTC P0725)Inputted engine rev.
signal is too low or
too high.Engine rev. is processed as 4000 rpm.
No compensation or judgement for gear shift control, for
which engine rev. is considered, is processed.
Lock-up function is turned OFF.
Engine coolant
temp./Barometric
pressure signal cir-
cuit
(DTC P1709)No or abnormal
engine coolant temp.
signal is inputtedNo compensation for gear shift control, for which engine cool-
ant temp. and barometric pressure are considered, is pro-
cessed.
Lock -up function is turned OFF. Area Detecting condition Fail safe function

7B-10 AUTOMATIC TRANSMISSION (4 A/T)
CHANGE MECHANISM
The same select pattern shift lever is used as the floor type and
frequently used “N” and “D” ranges are made selectable freely. Throttle position
signal circuit
(DTC P1700)No or abnormal throt-
tle opening signal is
inputtedScheduling of automatic gear shift is performed as throttle
valve opening is 0%.
Control of automatic gear shift (i.e. control of oil pressure) is
performed as throttle valve opening is 100%.
Coast down shifting is performed when brake is applied and
engine rev. is less than 1,500 rpm.
Lock-up function is turned OFF.
Transmission con-
trol system electri-
cal
(DTC P0702)Solenoid power sup-
ply relay output volt-
age is too high
although TCM orders
relay to turn off or
relay output voltage is
too low although TCM
orders relay to turn
on.When relay shorted, the gear is fixed as the followings and
lock-up function is turned OFF.
“P” range →
P, “R” range →
R, “N” range →
N,
“D” range →
3rd, “2” range →
2nd, “L” range →
1st
When relay open, power supply to all solenoids is cut and the
gear is fixed as the followings. Lock-up function is turned
OFF.
“P” range →
P, “R” range →
R, “N” range →
N,
“D”/“2”/“L” range →
3rd
Internal malfunc-
tion of TCM
(DTC P1702)Incorrect calculations
of checking TCM pro-
grammed data indi-
cated.Power supply to all solenoid is cut and the gear is fixed as fol-
lows :
“P” range P, “R” range R, “N” range N,
“D”/“2”/“L” range “3rd Area Detecting condition Fail safe function

AUTOMATIC TRANSMISSION (4 A/T) 7B-11
AUTOMATIC GEAR SHIFT DIAGRAM
Automatic shift schedule as a result of shift control is shown below.
[For 2WD model]
Gear Shift Diagram
TCC Lock-up Diagram
Shift
Throttle opening 1→
22→
33→
44→
33→
22→
1
Full throttle 44 98 - 135 87 35
Closed throttle 13 26 43 34 9 9