AUTOMATIC TRANSMISSION SUZUKI GRAND VITARA 2000 2.G Service User Guide

YH4
GRAND
VITARA
AUTOMATIC TRANSMISSION (4 A / T) 7B1-3
1. Torque converter
2. Overdrive input shaft
3. Oil pump
4. Overdrive brake
5. Overdrive clutch
6. Forward clutch input shaft
7. Forward clutch
8. Direct clutch
9. One-way clutch
10. Second coast brake
11. Second brake
12. Reverse brake
13. Front planetary gear
14. Rear planetary gear
15. Overdrive planetary gear
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 and is equipped with an electronically controlled
lock-up mechanism. The gear shift device consists of 3 sets of planetary gear units, 3 disc type clutches, 4 disc
type brakes and 3 one-way clutches. The gear shift is done by selecting one of 6 positions (ªPº, ªRº, ªNº, ªDº, ª2º
and ªLº) 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 (except at 4L) and shift-down from the overdrive mode. Also, by using
the P / N change switch located on the console box, it is possible to select the gear change timing of 2 modes, nor-
mal and power.

YH4
GRAND
VITARA
7B1-4 AUTOMATIC TRANSMISSION (4 A / T)
ItemSpecifications
Torque
conver-
terType
Stall torque ratio3-element, 1-step, 2-phase type (with TCC (lock-up)
mechanism)
2.4 (G16 engine) 2.0 (J20 engine) 1.9 (H25 engine)
Oil
pumpType
Drive systemTrochoid type oil pump
Engine driven
TypeForward 4-step, reverse 1-step planetary gear type
Shift position
ªPº range Gear in neutral, output shaft fixed,engine start
ªRº range Reverse
ªNº range Gear in neutral, engine start
ªDº range Forward 1st
2nd
3rd
4th (O / D)
(O / D ON) automatic gear change
ªDº range Forward 1st
2nd
3rd
(O / D OFF) automatic gear change
ª2º range (Normal mode) Forward 1st
2nd  3rd automatic gear
change
(Power mode) Forward 2nd  3rd automatic gear
change and fixed at 2nd gear
ªLº range Forward 1st  2nd  3rd reduction, and fixed at 1st gear
GearEngine typeG16 engineJ20 / H25 engines
change
device1st (low gear)2.8262.826device2nd (second gear)1.4931.493
Gear3rd (top gear)1.0001.000Gear
ratio4th (overdrive
4th gear)0.7300.689
Reverse (reverse
Reverse gear)2.7032.703
Control elements
Wet type multi-disc clutch 3 sets. . . . . . . . . .
Wet type multi-disc brake 4 sets. . . . . . . . . .
One-way clutch 3 sets. . . . . . . . . . . . . . . . . . .
TransferHi: 1.000 Lo: 1.816 (4WD model only)
Final gear reduction
ratio (Differential)5.125 (G16 engine) 4.875 (J20 / H25 engines)
Lubrica-
tionLubrication systemForce feed system by oil pump
CoolingCooling systemRadiator assisted cooling (water-cooled)
Fluid usedAn equivalent of DEXRON
III

YH4
GRAND
VITARA
AUTOMATIC TRANSMISSION (4 A / T) 7B1-5
1. Overdrive clutch
2. Overdrive brake
3. Forward clutch
4. Direct clutch
5. Second coast brake
6. Second brake
7. Reverse brake
8. One-way clutch No.2
9. One-way clutch No.1
10. Overdrive one-way clutch
11. Overdrive input shaft
12. Forward clutch input shaft
13. Intermediate shaft
CLUTCH / BRAKE FUNCTIONS
Part NameFunction
Overdrive clutchMeshes overdrive carrier and overdrive sun gear.
Overdrive brakeFixes overdrive sun gear.
Overdrive one-way clutchMeshes overdrive carrier and overdrive sun gear only when driven
by engine.
Forward clutchMeshes input shaft and intermediate shaft.
Direct clutchMeshes input shaft with front sun gear and rear sun gear.
Second coast brakeFixes front sun gear and rear sun gear.
Second brakeFixes outer race of one-way clutch No.1, to prevent front sun gear
and rear sun gear from turning counterclockwise (reverse direction
of engine input rotation direction).
Reverse brakeFixes front planetary carrier.
One-way clutch No.1Prevents front sun gear and rear sun gear from turning counterclockwise
only when second brake is at work.
One-way clutch No.2Prevents front planetary carrier from turning counterclockwise.

YH4
GRAND
VITARA
7B1-6 AUTOMATIC TRANSMISSION (4 A / T)
Element
Shift
position
TABLE OF COMPONENT OPERATION
SolenoidSolenoidO/DForwardDirect clutchO/DSecondSecondReverse brakeO/DOne-wayOne-wayvalve
No. 1±Avalve
No. 1±BO/DclutchForwardclutchInner
pistonOuter
pistonO/Dbrakecoast
brakeSecondbrakeInner
pistonOuter
pistonone-way
clutchyclutch
No. 1yclutch
No. 2
P
X
±±±±±±±±
±±
R
X
±

±±±


±±
N
X
±±±±±±±±
±±
1st gear
X

±±±±±±±
±

D2nd gear



±±±±
±±

±D3rd gearX


±
±±
±±
±±
O/DXX±
±

±
±±±±±
1st gear
X

±±±±±±±
±

22nd gear



±±±

±±
±±2
3rd gear
(Fail safe)X


±
±±
±±
±±
1st gear
X

±±±±±


±±
L2nd gear
(Fail safe)



±±±

±±
±±

: ON, X: OFF

YH4
GRAND
VITARA
Engine
Vehicle speed
sensor
Throttle position
sensor
ECT sensor
Cruise control
module
(if equipped)Torque converter Planetary gear
Final gear
reduction unit
Oil pump
Shift and TCC
solenoid valvesClutch and brake
Control valve
ªO / D OFFº lamp
ªPOWERº lamp
MILTransmission range
switch
O / D cut switch
P / N change switch
Transfer 4L switch
(if equipped)
CMP sensor Powertrain (engine) control module
Power transmission
Fluid pressure circuit
Electric signalInput speed sensor Brake pedal switch
Output speed sensor
AUTOMATIC TRANSMISSION (4 A / T) 7B1-7
ELECTRONIC SHIFT CONTROL SYSTEM
The gear ratio change in ªDº or ª2º range and torque converter clutch operation are controlled by Powertrain (En-
gine) Control Module.

YH4
GRAND
VITARA
7B1-8 AUTOMATIC TRANSMISSION (4 A / T)
G16 / J20 Engines
1. PCM (ECM)
2. VSS
3. CMP sensor
4. TP sensor
5. ECT sensor
6. A / T input speed sensor
7. A / T output speed sensor
8. Transmission range switch9. Shift solenoid-A
10. Shift solenoid-B
11. TCC solenoid
12. Data link connector
13. Cruise control module
14. ªPOWERº lamp
15. ªO / D OFFº lamp
16. MIL17. O / D cut switch
18. P / N change switch
19. 4WD low switch
20. Main relay
21. Ignition switch
22. Battery
23. PCM (ECM) connector terminal
(viewed from harness side) Bl / Y
Bl / G
W
OrC51-1-11
C51-1-10
C51-1-23
C51-1-22
12V

YH4
GRAND
VITARA
AUTOMATIC TRANSMISSION (4 A / T) 7B1-9
H25 Engine
1. PCM (ECM)
2. VSS
3. CMP sensor
4. TP sensor
5. ECT sensor
6. Brake pedal switch
7. A / T input speed sensor
8. A / T output speed sensor9. Transmission range switch
10. Shift solenoid-A
11. Shift solenoid-B
12. TCC solenoid
13. Data link connector
14. Cruise control module
15. ªPOWERº lamp
16. ªO / D OFFº lamp17. MIL
18. O / D cut switch
19. P / N change switch
20. 4WD low switch
21. Main relay
22. Ignition switch
23. Battery
24. PCM (ECM) connector terminal
(viewed from harness side) Bl / Y
Bl / G
W
OrC51-1-16
C51-1-8
C51-1-10
C51-1-9
12V

YH4
GRAND
VITARA
7B1-10 AUTOMATIC TRANSMISSION (4 A / T)
Shift the select
lever with its
button pushed
in.
Shift the select
lever without
pushing its
button.
RANGE
GEAR
SOLENOIDS
Fail Safe Function
This function is provided by the safe mechanism that assures safe driveability even when the shift solenoid valve
or speed sensor fails.
The table below shows the gear position in each shift under a normal/abnormal condition.
Condition
Shift position
Normal
Shift solenoid
valve-A(#1)
abnormalShift solenoid
valve-B(#2)
abnormalShift solenoid
valves-A&B
(#1 and #2) abnormal
1st1st
D2nd3rdO/DD3rdO/DO/D
O/DO/D
1st1st
22nd3rd3rd3rd
(3rd)3rd
L1st1st1st1stL(2nd)(2nd)1st1st
Change Mechanism
The same select pattern shift lever is used as the floor type and fre-
quently used ªNº and ªDº ranges are made selectable freely.
Operation of Shift Solenoids and TCC Solenoid
D2LP, N & R
1st2nd3rd4th
(O / D)1st2nd1stÐ
Shift solenoid-A (#1, NO.1)








Shift solenoid-B (#2, NO.2)








TCC solenoid









: ON (valve is open)
: OFF (valve is closed)

YH4
GRAND
VITARA
Gear Shift Diagram
TCC Lock-up Diagram
Vehicle speedUpshift
Downshift
Throttle valve opening
Vehicle speed
Throttle valve opening
TCC ON
TCC OFF 4th
gear
3rd
gear(km / h)
(km / h)
AUTOMATIC TRANSMISSION (4 A / T) 7B1-11
AUTOMATIC GEAR SHIFT DIAGRAM
Automatic shift schedule as a result of shift control is shown below. In case that select lever is shifted to L at a higher
than 52 km / h or 33 mile / h speed for G16 engine (45 km / h or 28 mile / h for J20 engine, 55 km / h or 34 mile / h for
H25 engine), 2nd or 3rd gear is operated and then down shifts to 1st at a speed lower than that. No up shift is
available in L.
The same as, the select lever is shifted to 2 at a higher than 102 km/h (64 mile/h) speed for G16/J20 engines (105
km / h or 65 mile / h for H25 engine), 3rd gear is operated and then down shifts to 2nd at a speed lower than that.
Power Mode For G16 EngineUnit: km / h
(mile/h)
Shift
Throttle opening
1
22
33
44
33
22
1
Full throttle49
(30)94
(58)153
(95)124
(77)85
(53)43
(27)
Closed throttle18
(11)36
(23)48
(30)40
(25)29
(18)7
(4)

YH4
GRAND
VITARA
Gear Shift Diagram
TCC Lock-up Diagram
Vehicle speedUpshift
Downshift
Throttle valve opening
Vehicle speed
Throttle valve opening
TCC ON
TCC OFF 4th
gear3rd
gear(km / h)
(km / h)
7B1-12 AUTOMATIC TRANSMISSION (4 A / T)
Normal Mode For G16 EngineUnit: km / h
(mile/h)
Shift
Throttle opening
1
22
33
44
33
22
1
Full throttle45
(28)94
(58)136
(85)124
(77)74
(46)39
(24)
Closed throttle14
(9)32
(20)45
(28)35
(22)29
(18)7
(4)