2002 SUZUKI GRAND VITARA Reverse gear

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
7B1-30 AUTOMATIC TRANSMISSION (4 A / T)
Running condition Gear shift Abnormal
noise
ConditionPossible CauseCorrection
Poor 1st speed run-
ning or excessive
slippage in ªDº or ª2º
Fluid pressure leakage from forward clutch
due to wear or breakage of O/D case seal
ringReplace.

Overdrive clutch slippingReplace.
Unable to run or ex-
cessive slippage in
ªLº range
Fluid pressure leakage of forward clutch
due to wear or breakage of O/D case seal
ringReplace.

Reverse brake disc slippingReplace.

Broken brake piston O-ringReplace.
Unable to run or ex-
cessive slippage in
ªRº range
Fluid pressure leakage to direct clutch due
to wear or breakage of center support seal
ringReplace.

Worn direct clutchReplace.
Poor 1±2 shift, ex-
cessive slippage
Fluid pressure leakage to overdrive clutch
due to wear or breakage of O/D case seal
ringReplace.

Faulty second brakeReplace.

Broken O-ring of second brake pistonReplace.

Faulty second coast brake (in ª2º range)Replace.
Poor 2±3 shift, ex-
cessive slippage
Fluid pressure leakage to overdrive clutch
due to wear or breakage of O/D case seal
ringReplace.

Worn direct clutch bushingReplace.

Direct clutch slippingReplace.

Foreign material caught in direct clutch pis-
ton check ballReplace.
Poor start or surging
in ªDº range
Fluid pressure leakage of forward clutch
due to wear or breakage of O/D case seal
ringReplace.

Malfunction of forward clutchReplace.
Poor 3±4 shift, ex-
ili

Faulty overdrive brakeReplace.
cessive slippage
Faulty overdrive clutchReplace.
Poor start or judder-
ing in ªRº range
Fluid pressure leakage of direct clutch due
to wear or breakage of oil center support
seal ringReplace.

Worn direct clutchReplace.
Excessive shock on
1± 2 shift
Faulty one-way clutchReplace.
Non operate lock-up
system
Faulty torque converterReplace.
Abnormal noise in
ªPº or ªNº range
Worn oil pumpReplace.
SCAN TOOL DATA-Refer to SECTION 6 / 6-1.
INSPECTION OF PCM AND ITS CIRCUIT-Refer to SECTION 6 / 6-1.
WIRE HARNESS AND CONNECTORS-Refer to SECTION 6 / 6-1.

YH4
GRAND
VITARA
7B1-56 AUTOMATIC TRANSMISSION (4 A / T)
8) Stall speed should be within the following specification.
Stall speed: 2,100 ± 2,400 r / min. for G16 engine
2,300 ± 2,600 r / min. for J20 engine
2,300 ± 2,600 r / min. for H25 engine
Check result
Possible cause
Lower than standard
level
Faulty engine output

Defective torque converter
Higher than standard
level in ªDº range
Slippery O/D clutch

Slippery forward clutch

Malfunctioning O/D one-way clutch

Malfunctioning one-way clutch No. 2

Low line pressure
Higher than standard
level in ªRº range
Slippery direct clutch

Slippery reverse brake

Low fluid pressure

Slippery O/D clutch

Defective O/D one-way clutch
ROAD TEST
This test is to check if upshift and downshift take place at specified
speed while actually driving vehicle on a level road.
WARNING:

Carry out test in very little traffic area to prevent an acci-
dent.

Test requires 2 persons, a driver and a tester.
1) Warm up engine.
2) With engine running at idle, shift select lever ªDº.
3) Accelerate vehicle speed by depressing accelerator pedal grad-
ually.
4) While driving in ªDº range, check if gear shift occurs properly as
shown in Gear Shift Diagram in this section.
Test result
Possible cause
When 1
2 upshift fails to
occur1±2 shift valve stuck
When 2
3 upshift fails to
occur2±3 shift valve stuck
When 3
O/D upshift
fails to occur3±4 shift valve stuck
When gear shift point is in-
correct
Maladjusted throttle cable

Defective shift solenoid valve
-A or -B

1±2, 2±3 or 3±4 shift valve not
operating properly

YH4
GRAND
VITARA
1
1. Shift solenoids connector
AUTOMATIC TRANSMISSION (4 A / T) 7B1-57
MANUAL ROAD TEST
This test check the gear being used in ªLº, ª2º or ªDº range when
driven with unoperated gear shift control system. Test drive vehicle
on a level road.
NOTE:
Before this test, check diagnostic trouble code (DTC).
1) Disconnect coupler of shift solenoid valves on transmission.
WARNING:
To avoid the danger of being burned, do not touch the hot
exhaust system when disconnecting shift solenoid
valves coupler.
2) With select lever in ªPº, start engine and warm it up.
3) With select lever in ªLº range, start vehicle and accelerate to 20
km/h (12.5 mile/h). Check in this state that 1st gear is being
used.
4) At 20 km/h (12.5 mile/h), shift select lever to 2 range and acceler-
ate to 40 km/h (25 mile/h). Check in this state that 3rd gear is
being used.
5) At 40 km/h (25 mile/h), shift select lever to D range and check
that O/D gear is used when speed is higher than 40 km/h (25
mile/h).
6) After above checks, stop vehicle then engine, and connect shift
solenoids coupler with ignition switch OFF.
WARNING:
To avoid the danger of being burned, do not touch the hot
exhaust system when connecting shift solenoid valves
coupler.
7) Clear DTC with scan tool.
TIME LAG TEST
This test is to check conditions of clutch, reverse brake and fluid
pressure. ªTime lagº means time elapsed since select lever is
shifted with engine idling till shock is felt.
1) With chocks placed before and behind front and rear wheels re-
spectively, depress brake pedal.
2) Start engine.
3) With stop watch ready, shift select lever from ªNº to ªDº range
and measure time from that moment till shock is felt.
4) Similarly measure time lag by shifting select lever from ªNº to ªRº
range.
Specification for ªNº
ªDºLess than 1.2 sec.
time lagªNº
ªRºLess than 1.5 sec.
NOTE:

When repeating this test, be sure to wait at least minute
after select lever is shifted back to ªNº range.

Engine should be warmed up fully for this test.
Test resultPossible causes
When ªNº
ªDº time lag
exceeds specification
Low line pressure

Worn forward clutch
When ªNº
ªRº time lag
exceeds specification
Low line pressure

Worn direct clutch

Worn reverse brake

YH4
GRAND
VITARA
7B1-58 AUTOMATIC TRANSMISSION (4 A / T)
ENGINE BRAKE TEST
WARNING:
Before test, make sure that there is no vehicle behind so as
to prevent rear-end collision.
1) While driving vehicle in 3rd gear of ªDº range, shift select lever
down to ª2º range and check if engine brake operates.
2) In the same way as in step 1, check engine brake for operation
when select lever is shifted down to ªLº range.
3) If engine brake fails to operate in above tests, possible causes
for such failure are as follows. Check each part which is sus-
pected to be the cause.
Condition
Possible cause
Fails to operate when shifted
down to ª2º rangeSecond coast brake defec-
tive
Fails to operate when shifted
down to ªLº rangeReverse brake defective
ªPº RANGE TEST
1) Stop vehicle on a slope, shift select lever to ªPº range and at the
same time apply parking brake.
2) After stopping engine, depress brake pedal and release parking
brake.
3) Then, release brake pedal gradually and check that vehicle re-
mains stationary.
4) Depress brake pedal and shift select lever to ªNº range.
5) Then, release brake pedal gradually and check that vehicle
moves.
WARNING:
Before test, check to make sure no one is around vehicle
or down on a slope and keep watchful for safety during
test.