2004 SUZUKI GRAND VITARA Torque converter clutch

YH4
GRAND
VITARA
L
LH : Left Hand
LSPV : Load Sensing Proportioning
Valve
M
MAF Sensor : Mass Air Flow Sensor
(Air Flow Sensor, AFS, Air
Flow Meter, AFM)
MAP Sensor : Manifold Absolute Pressure
Sensor (Pressure Sensor, PS)
Max : Maximum
MFI : Multiport Fuel Injection
(Multipoint Fuel Injection)
Min : Minimum
MIL : Malfunction Indicator Lamp
(ªCHECK ENGINEº Light)
M / T : Manual Transmission
N
NOx : Nitrogen Oxides
O
OBD : On-Board Diagnostic System
(Self-Diagnosis Function)
O / D : Overdrive
OHC : Over Head Camshaft
P
PNP : Park / Neutral Position
P / S : Power Steering
PSP Switch : Power Steering Pressure
Switch (P / S Pressure Switch)
PCM : Powertrain Control Module
PCV : Positive Crankcase Ventilation
R
RH : Right Hand
S
SAE : Society of Automotive
Engineers
SDM : Sensing and Diagnostic
Module (Air bag controller,
Air bag control module)
SFI : Sequential Multiport Fuel
Injection
SOHC : Single Over Head Camshaft
T
TBI : Throttle Body Fuel Injection
(Single-Point Fuel Injection,
SPI)
TCC : Torque Converter Clutch
TCM : Transmission Control Module
(A / T Controller, A / T Control
Module)
TP Sensor : Throttle Position Sensor
TVV : Thermal Vacuum Valve
(Thermal Vacuum Switching
Valve, TVSV, Bimetal Vacuum
Switching Valve, BVSV)
TWC : Three Way Catalytic
Converter (Three Way
Catalyst)
2WD : 2 Wheel Drive
V
VIN : Vehicle Identification
Number
VSS : Vehicle Speed Sensor
W
WU-OC : Warm Up Oxidation
Catalytic Converter
WU-TWC : Warm Up Three Way
Catalytic Converter
0A-22 GENERAL INFORMATION

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
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
AUTOMATIC TRANSMISSION (4 A / T) 7B1-29
Gear shift Transmission fluid Running condition
ConditionPossible CauseCorrection
Poor 3±4 shift, ex-
3±4 shift valve stickingReplace.
cessive slippage
Shift solenoid valve-B stickingReplace.
Excessive shock on
Regulator valve stickingReplace.
1±2 shift
Faulty accumulator, second brake pistonReplace.
Excessive shock on
Regulator valve stickingReplace.
2±3 shift
Faulty accumulator, direct clutch pistonReplace.
Excessive shock on
3±4 shift
Regulator valve stickingReplace.
Non operate lock-
TCC (Lock-up) control valve stickingReplace.
up system
Solenoid valve No.2 (TCC solenoid valve)
stickingReplace.
TROUBLE DIAGNOSIS TABLE 3
ConditionPossible CauseCorrection
Low fluid pressure
Leakage from oil pressure circuitOverhaul.
Unable to run in all
range
Wear in oil pumpReplace.

Seizure in oil pumpReplace.

Fluid pressure leakage to over drive clutch
due to wear of oil pump bushingReplace.

Faulty in torque converterReplace.

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