Engine oil SUZUKI SWIFT 2006 2.G Service Workshop Manual

Downloaded from www.Manualslib.com manuals search engine 4A-2 Brake Control System and Diagnosis:
Brake Pedal Foot Protection System ConstructionS7RS0B4101004
Should a front crash occur and the engine push the dash panel toward the interior side, the brake pedal bracket is also
pushed toward the interior side. In this case, the brake pedal lever comes off from the brake pedal, thereby preventing
the brake pedal from moving rearward.
CAUTION!
Never disassemble brake pedal assembly. Disassemble will spoil its original function. If faulty
condition is found, replace it with new one.

[A]: Before crash2. Brake booster5. Brake pedal bracket
[B]: After crash 3. Brake pedal lever
1. Brake pedal 4. Booster push clevis rod
I6RW0C410001-02

Downloaded from www.Manualslib.com manuals search engine 4A-4 Brake Control System and Diagnosis:
Rear Brake Hose / Pipe ConstructionS7RS0B4101003
Diagnostic Information and Procedures
Brakes Diagnosis NoteS7RS0B4104001
Road Testing Brakes
Brakes should be tested on dry, clean, smooth and
reasonably level roadway which is not crowned. Road
test brakes by making brake applications with both light
and heavy pedal forces at vari ous speeds to determine if
the vehicle stops evenly and effectively. Also drive
vehicle to see if it leads to one side or the other without
brake application. If it does, check the tire pressure, front
wheel alignment and front suspension attachments for
looseness. See diagnosis table for other causes. Brake Fluid Leaks
Check the master cylinder fl
uid levels. While a slight
drop in reservoir level does result from normal lining
wear, an abnormally low leve l indicates a leak in the
system. In such a case, chec k the entire brake system
for leakage. If even a slight ev idence of leakage is noted,
the cause should be corrected or defective parts should
be replaced.
Substandard or Contaminated Brake Fluid
Improper brake fluid, mineral oil or water in the fluid may
cause the brake fluid to boil or the rubber components in
the hydraulic system to deteriorate.
[A]: ABS model 6. Master cylinder13. ESP® hydraulic unit
[B]: ESP ® model 7. From hydraulic unit to 4-way joint right : 11 N⋅m (11.0 kgf-m, 8.0 lb-ft)
1. From master cylinder primary to hydraulic unit 8. From hydraulic unit to 4-way joint left: 15 N⋅m (1.5 kgf-m, 11.0 lb-ft)
2. From master cylinder secondary to hydraulic unit 9. 4-way joint: 16 N⋅m (1.6 kgf-m, 11.5 lb-ft)
3. From hydraulic unit to right front brake 10.4-way joint to left rear brake hose : 19 N⋅m (1.9 kgf-m, 14.0 lb-ft)
4. From hydraulic unit to left front brake 11. 4-way joint to right rear brake hose
5. ABS hydraulic unit 12. Master cylinder fixing nut
I6RS0C410003-01
A: View A4. Right rear brake hose8. Flexible hose joint bolt
1. To left rear brake hose 5. Left rear brake hose to left brake9. Caliper
2. To right rear brake hose 6. Right rear brake hose to right brake: 16 N⋅m (1.6 kgf-m, 12.0 lb-ft)
3. Left rear brake hose 7. Brake flexible hose: 23 N⋅m (2.3 kgf-m, 17.0 lb-ft)

Downloaded from www.Manualslib.com manuals search engine Brake Control System and Diagnosis: 4A-5
If deterioration of rubber is evident, disassemble all
hydraulic parts and wash with alcohol. Dry these parts
with compressed air before assembly to keep alcohol out
of the system. Replace all rubber parts in the system,
including hoses. Also, when working on the brake
mechanisms, check for fluid on the linings.
If excessive fluid is found, replace the pads. If master cylinder piston seals
are satisfactory, check for
leakage or excessive heat co nditions. If leakage is not
found, drain fluid, flush with brake fluid, refill and bleed
system.
The system must be flushed if there is any doubt as to
the grade of fluid in the system or if fluid has been used
which contained parts that have been subjected to
contaminated fluid.
Brakes Symptom DiagnosisS7RS0B4104002
Condition Possible cause Correction / Reference Item
Not enough braking force Brake oil leakage from brake lines Locate leaking point and repair.
Brake disc or brake pad stained with oil Clean or replace.
Overheated brakes Determine cause and repair.
Badly worn brake pad Replace.
Malfunctioning caliper assembly Repair or replace.
Malfunctioning brake booster Check system and replace assembly.
Malfunctioning brake master cylinder Check system and replace as necessary.
Air in system Bleed system.
Malfunctioning ABS (ESP ®). Check system and replace as necessary.
Brake pull (Brakes not
working in unison) Brake pad and disc are wet with water or
stained with oil in some brakes Clean or replace.
Disc is out of round in some brakes Replace.
Tires are inflated unequally Inflate equally.
Disturbed front wheel alignment Adjust as prescribed.
Unmatched tires on same axle Tires with approximately the same amount of
tread should be used on the same axle.
Restricted brake pipes or hoses Check for soft hoses and damaged lines.
Replace with new hoses and new double-
walled steel brake tubing.
Malfunctioning caliper assembly Caliper should slide.
Check for stuck or sluggish pistons and proper
lubrication of caliper slide pin.
Loose suspension parts Check all suspension mountings.
Loose calipers Check and torque bolts to specifications.
Noise (High pitched
squeak without brake
applied) Contact wear indicator to brake disc
Replace brake pads.
Worn brake pad Replace brake pads.
Excessive pedal travel
(Pedal stroke too large) Partial brake system failure
Check brake systems and repair as necessary.
Brake fluid leaking Repair the leaking point and bleed air.
Air in system (soft / spongy pedal) Bleed system.
Brake locked Malfunctioning ABS (ESP®) Check system referri ng to “ABS Check in
Section 4E” or “Electronic Stability Program
System Check in Section 4F”.
Dragging brakes (A very
light drag is present in all
brakes immediately after
pedal is released.) Master cylinder pistons not returning
correctly
Replace master cylinder.
Restricted brake pipes or hoses Check for soft hoses or damaged pipes and
replace with new hoses and/or new brake
piping.
Incorrect parking brake adjustment on
rear brakes Check and adjust to correct specifications.
Weakened or broken return springs in
rear brakes. Replace.
Sluggish parking brake cables or linkage Repair or replace.
Brake caliper piston sticking Repair as necessary.
Badly worn piston seal in caliper Replace piston seal.
Improper brake pedal free height Check brake pedal free height.

Downloaded from www.Manualslib.com manuals search engine Brake Control System and Diagnosis: 4A-7
Repair Instructions
Brake Pedal ComponentsS7RS0B4106019
CAUTION!
Never disassemble brake pedalassembly.
Disassemble will spoil its originalfunction. If
faulty condition is found, replaceit with new
one.

Brake Pedal Free Height InspectionS7RS0B4106001
1) Check brake pedal free height. If it is not within specification, check and ad just following item 2) and
6).
Brake pedal free height “a” from carpet
130 – 150 mm (5.1 – 5.9 in.) 2) Check measurement between booster mounting
surface and center of clevis pin hole. When booster
push rod clevis has been reinstalled, it is important
that the measurement is adj usted (refer to “Brake
Booster Inspection and Adjustment”).
3) Check stop light switch position . Adjust it if it is out of
specification.
4) Check pedal for dent.
5) Check brake booster for installation.
6) Check brake booster push rod for length.
Brake Pedal Play InspectionS7RS0B4106002
Pedal play should be within the following specification. If
out of specification, check stop light switch for proper
installation position and adjust if necessary.
Also check pedal shaft bolt and booster clevis pin
installation for looseness and replace if defective.
Brake pedal play
“a”
: 1 – 8 mm (0.04 – 0.31 in.)
1. Brake pedal : 13 N⋅m (1,3 kgf-m, 9.5 lb-ft)
2. Brake pedal bracket
(a) 1
2
(a)
I7RS0B410002-01
I6RS0C410004-02
“a”I3RH0A410010-01

Downloaded from www.Manualslib.com manuals search engine 4A-8 Brake Control System and Diagnosis:
Excessive Pedal Travel InspectionS7RS0B4106003
1) Start engine.
2) Depress brake pedal a few times.
3) With brake pedal depressed with approximately 300 N (30 kg, 66 lbs) load, measure brake pedal to wall
(dash panel silencer) clearance “a”. If clearance “a”
is less than specification, the most possible cause is
air in lines. Should clearance “a” remain less than
specification even after bleeding of system, other
possible infrequent cause is booster push rod length
out of adjustment.
• Bleed brake system. Refer to “Air Bleeding of Brake System”.
Brake arm pedal to wall clearance “a”
When pedal depressed at 300 N (30 kg, 66 lbs):
over 75 mm (2.95 in.)
Brake Fluid Level InspectionS7RS0B4106004
1) Check master cylinder, reservoir and reservoir hose (if equipped) for crack, damage and brake fluid
leakage. If any faulty condition exists, correct or
replace.
2) Check that brake fluid level is between MAX and MIN marks on reservoir.
NOTE
Be sure to use particular brake fluid either as
indicated on reservoir cap of that vehicle or
recommended in owner’s manual which
comes along with that vehicle. Use of any
other fluid is strictly prohibited.
Fluid level should be between MIN and MAX
lines marked on reservoir.
When brake warning lamp lights sometimes
during driving, replenis h fluid to MAX level.
When fluid decreases quickly, inspect brake
system for leakage. Correct leaky points and
then refill to specified level.

CAUTION!
Do not use shock absorber fluid or any other
fluid which contains mineral oil. Do not use a
container which has been used for mineral oil
or a container which is wet from water.
Mineral oil will cause swelling and distortion
of rubber parts in hydraulic brake system and
water mixed into brake fluid will lower fluid
boiling point. Keep all fluid containers
capped to prevent contamination.

Stop Light Switch AdjustmentS7RS0B4106005
Adjustment should be made as follows. Pull up brake
pedal toward you and while holding it there, adjust
switch position so that clea rance between end of thread
and brake pedal is as specified. Then lock it by turning
clockwise.
Clearance between brake pedal and stop light switch
“a”: 1.2 – 2.2 mm (0.05 – 0.08 in.)
I6RS0C410005-02
I4RS0B410006-01
I4RS0A410007-01

Downloaded from www.Manualslib.com manuals search engine 4A-14 Brake Control System and Diagnosis:
6) Fill reservoir with specified fluid.
7) After completing the work, bleed air from brake and clutch system referring to “Air Bleeding of Brake
System” and “Air Bleeding of Clutch System in
Section 5C” (M/T model).
8) Install cowl top panel referring to “Cowl Top Components in Section 9K”.
9) Install windshield wiper referring to “Windshield
Wiper Removal and Insta llation in Section 9D”.
10) Perform brake test and check each installed part for fluid leakage.
Master Cylinder Assembly Disassembly and
Assembly
S7RS0B4106013
Disassembly
1) Push in primary piston (1) to remove secondary
piston stopper pin (2) from master cylinder as
shown.
2) Remove circlip (1).
3) Remove piston guide and primary piston. Then remove secondary piston by blowing compressed air
(2) into hole. Be cautions during removal as
secondary piston jumps out.
WARNING!
Do not apply too highly compressed air
which will cause piston to jump out of
cylinder. Place a cloth to prevent piston from
damage. It should be taken out gradually with
moderately compressed air. Do not place
your fingers in front of piston when using
compressed air.

Assembly
CAUTION!
• Never use any mineral oil such as kerosene oil and gasoline when washing
and assembling parts.
• Check inside of cylinder wall, pistons and cup seals are free from any foreign objects
such as dust and dirt and use case not to
cause any damage with a tool during
assembly.
• Do not drop parts. Do not use any part which has been dropped.

1) Apply brake fluid to inside of cylinder and contact surface of piston assembly (new piston cups, new O-
ring and piston guide).
2) Install secondary return spring and secondary piston (1) into cylinder body (4).
NOTE
Align oblong hole in secondary piston (2)
with stopper pin hole (3) in master cylinder
body (4) when installing it.

3) Install primary piston assembly into cylinder body.
4) Install piston stopper pin (2) with pistons pushed in all the way and install it.
I2RH01410025-01
I4RS0A410017-01
I2RH01410027-01
I4RS0A410018-01

Downloaded from www.Manualslib.com manuals search engine 5-ii Table of Contents
DTC P1878: Torque Converter Clutch Shudder .......................................................... 5A-75
DTC P2762: Torque Converter Clutch (TCC) Pressure Control Sole noid Control Circuit
Range /Performance ....................................... 5A-76
DTC P2763: Torque Converter Clutch Pressure Control Sole noid Control Circuit
High ................................................................. 5A-78
DTC P2764: Torque Converter Clutch Circuit Pressure Control Sole noid Control Circuit
Low ................................................................. 5A-80
Inspection of TCM and Its Circuits .................... 5A-82
TCM Power and Ground Circuit Check ............. 5A-86
Brake Interlock System Inspection .................... 5A-87
Repair Instructions ........... .................................5A-88
Learning Control Initializat ion ............................ 5A-88
A/T Fluid Level Check ....................................... 5A-89
A/T Fluid Change .............................................. 5A-90
Select Lever Components ... .............................. 5A-90
Select Lever Assembly Removal and Installation ....................................................... 5A-90
Select Lever Knob Installa tion........................... 5A-90
Select Lever Inspection .... ................................. 5A-91
“3” Position Switch Inspec tion ........................... 5A-91
Shift Lock Solenoid Inspec tion .......................... 5A-91
Shift Lock Solenoid Replacement ..................... 5A-91
Select Cable Components ................................ 5A-92
Select Cable Removal and Installation ............. 5A-92
Select Cable Adjustment ................................... 5A-93
Key Interlock Cable Removal and Installation... 5A-93
Transmission Range Sensor (Shift Switch) Inspection and Adjustment .............................. 5A-95
Output Shaft Speed Sensor Removal and Installation ....................................................... 5A-96
Output Shaft Speed Sensor Inspection ............. 5A-96
Input Shaft Speed Sensor Removal and Installation ....................................................... 5A-96
Input Shaft Speed Sensor Inspection................ 5A-97
Transmission Fluid Temperature Sensor Removal and Installation ................................. 5A-97
Transmission Fluid Temperature Sensor Inspection ........................................................ 5A-98
Solenoid Valves (Shift Solenoid Valves and Timing Solenoid Valve) Removal and
Installation ....................................................... 5A-98
Solenoid Valves (Shift Solenoid Valves, and Timing Solenoid Valve) Inspection .................. 5A-99
Pressure Control Soleno id Valves (Pressure
Control Solenoid and TCC Pressure Control
Solenoid) Removal and Inst allation .............. 5A-101
Pressure Control Solenoid Valve Inspection ... 5A-101
Transmission Control Module (TCM) Removal and Installation ............................... 5A-102
A/T Relay Inspection ....................................... 5A-103
Differential Side Oil Seal Replacement ........... 5A-103
A/T Fluid Cooler Hoses Replacement ............. 5A-104
Automatic Transaxle Unit Components........... 5A-105
Automatic Transaxle Unit Dismounting and Remounting ................................................... 5A-106
Automatic Transaxle Asse mbly Components . 5A-108 Automatic Transaxle Unit
Disassembly........... 5A-110
Oil Pump Assembly Components ................... 5A-121
Oil Pump Assembly Disassembly and Reassembly .................................................. 5A-122
Oil Pump Assembly Inspection ....................... 5A-122
Direct Clutch Assembly Components.............. 5A-124
Direct Clutch Assembly Preliminary Check ..... 5A-124
Direct Clutch Assembly Disassembly and Reassembly .................................................. 5A-125
Direct Clutch Assembly Inspection.................. 5A-127
Forward and Reverse Clutch Assembly Components .................................................. 5A-128
Forward and Reverse Clutch Assembly Preliminary Check ......................................... 5A-129
Forward and Reverse Clutch Assembly Disassembly and Reassembly ...................... 5A-129
Forward and Reverse Clutch Assembly Inspection ...................................................... 5A-133
2nd Brake Piston Assembly Components ....... 5A-134
2nd Brake Piston Assembly Disassembly and Reassembly .................................................. 5A-134
Transaxle Rear Cover (O/D and 2nd Coast Brake Piston) Assembly Components........... 5A-135
Transaxle Rear Cover (O/D and 2nd Coast Brake Piston) Assembly Disassembly and
Reassembly .................................................. 5A-136
Transaxle Rear Cover (O/D and 2nd Coast Brake Piston) Assembly Inspection............... 5A-137
Countershaft Assembly Co mponents.............. 5A-138
Countershaft Assembly Disassembly and Reassembly .................................................. 5A-138
Valve Body Assembly Components ................ 5A-139
Valve Body Assembly Disassembly and Reassembly .................................................. 5A-140
Differential Assembly Components ................. 5A-141
Differential Assembly Disassembly and Reassembly .................................................. 5A-142
Differential Assembly Inspection ..................... 5A-143
Torque Converter Housing Disassembly and Reassembly .................................................. 5A-144
Transaxle Case Disassembly and Reassembly .................................................. 5A-146
Automatic Transaxle Unit Inspection and Adjus
tment .................................................... 5A-147
Automatic Transaxle Unit Assembly ............... 5A-150
Specifications .................. .................................5A-167
Tightening Torque Specifications .................... 5A-167
Special Tools and Equipmen t .........................5A-168
Recommended Service Material ..................... 5A-168
Special Tool .................................................... 5A-168
Manual Transmission/Tr ansaxle ............ 5B-1
General Description .............................................5B-1
Manual Transaxle Construction and Servicing .... 5B-1
Diagnostic Information and Procedures ............5B-3 Manual Transaxle Symptom Diagnosis............... 5B-3
Repair Instructions ............ ..................................5B-3
Manual Transaxle Oil Change............................. 5B-3
Differential Side Oil Seal Replacement ............... 5B-4

Downloaded from www.Manualslib.com manuals search engine Automatic Transmission/Transaxle: 5A-1
Transmission / Transaxle
Automatic Transmission/Transaxle
Precautions
Precautions in Diagnosing TroubleS7RS0B5100001
• Do not disconnect couplers from TCM, battery cable from battery, TCM ground wire harness from engine or
main fuse before checking the diagnostic information
(DTC, freeze frame data, etc.) stored in TCM memory.
Such disconnection will clea r memorized information
in TCM memory.
• Diagnostic information stored in TCM memory can be cleared as well as checked by using SUZUKI scan
tool or generic scan tool. Before using scan tool, read
its Operator’s (Instruction) Manual carefully to have
good understanding as to what functions are available
and how to use it.
It is indistinguishable wh ich module turns on MIL
because not only ECM but also TCM turns on MIL.
Therefore, check both ECM and TCM for DTC when
MIL lights on.
When checking TCM for DTC, keep in mind that DTC
is displayed on the scan tool as follows depending on
the scan tool used.
– SUZUKI scan tool displays DTC detected by TCM.
– Generic scan tool displays DTC detected by each of ECM and TCM simultaneously.
• Using SUZUKI scan tool the diagnostic information stored in TCM memory can be checked and cleared
as well. Before its use, be sure to read Operator’s
Manual supplied with it carefully to have good
understanding of its functions and usage.
• Be sure to read “Precautions for Electrical Circuit Service in Section 00” befo re inspection and observe
what is written there.
• TCM replacement
– When substituting a known-good TCM, check that all relays and actuators have resistance of
specified value.
Neglecting this check may result in damage to good
TCM.
• Communication of ECUs , ECM, TCM, ABS control
module, keyless start control module and BCM is
established by CAN (Controller Area Network).
Therefore, handle CAN communication line with care
referring to “Precaution for CAN Communication
System in Section 00”.
Precautions for Disassembly and ReassemblyS7RS0B5100002
When repairing automatic transaxle, it is necessary to
conduct the on-vehicle test to investigate where the
cause of the trouble lies first.
Then whether overhaul should be done or not is
determined. If the transaxle is disassembled without
such preliminary procedure, not only the cause of the
trouble would be unknown, but also a secondary trouble
may occur and often time would be wasted.
As the automatic transaxle consists of high precision
component, the following cautions should be strictly
observed when handling its parts in disassembly and
reassembly.
• Disassembling valve body assembly is prohibited
essentially. However, a few parts can be
disassembled. When disassembling valve body
component parts, confirm whether their parts are
allowed to disassemble or not referring to “Valve Body
Assembly Disassembly and Reassembly”.
• When component part of forward clutch, direct clutch, 2nd brake and/or O/D and 2nd coast brake, namely
clutch disc, brake disc, retaining plate and/or
separator plate, have been replaced, all learned
contents, which have been stored in TCM memory by
executing learning control, should be initialized
referring to “Learning Control Initialization”.
• Make sure to wash dirt off from the transaxle so that no such dirt will enter the transaxle during
dismounting and remounting.
• Select a clean place free from dust and dirt for overhauling.
• Place a rubber mat on the work bench to protect parts from damage.
• Work gloves or shop cloth should not be used. (Use a nylon cloth or a paper towel.)
• When separating the case joint, do not pry with a screwdriver or such but tap with a plastic hammer
lightly.
• Make sure to wash dirt off from the transaxle so that no such dirt will enter the transaxle during
disassembly and reassembly.
• Wash the disassembled parts in ATF (Automatic Transaxle Fluid) or kerosene (using care not to allow
ATF or kerosene to get on your face, etc.) and confirm
that each fluid passage is not clogged by blowing air
into it. But use kerosene to wash the discs, resin
washers and rubber parts.
• Replace each gasket, oil seal and O-ring with a new one.
• Apply ATF to sliding or rotating parts before
reassembly.

Downloaded from www.Manualslib.com manuals search engine 5A-2 Automatic Transmission/Transaxle:
CAUTION!
• Keep component parts in group for each subassembly and avoid mixing them up.
• Clean all parts with cleaning solvent thoroughly and air dry them.
• Use kerosene or automatic transaxle fluid as cleaning solvent.
• Do not use wiping cloths or rags to clean or dry parts.
• All oil passages should be blown out and checked to make sure that they are not
obstructed.
• Keep face and eyes away from solvent spray while air blowing parts.
• Check mating surface for irregularities and remove them, if any, and clean it again.
• Soak new clutch discs and brake discs in transaxle fluid for at least 2 hours before
assembly.
• Replace all gaskets and O-ring with new ones.
• Apply automatic transaxle fluid to all O- rings.
• When installing seal ring, be careful so that it is not expanded excessively, extruded or
caught.
• Replace oil seals that are removed and apply grease to their lips.
• Before installing, be sure to apply automatic transaxle fluid to sliding, rolling
and thrusting surface of all component
part. Also after installation, make sure to
check each part for proper operation.
• Always use torque wrench when tightening bolts.

• A new discs should be soaked in ATF at least 2 hours before use.
Part Inspection and Correction Table Part Inspect for Correction
Casted part,
machined part Small flaw, burr
Remove with oil
stone.
Deep or grooved
flaw Replace part.
Clogged fluid
passage Clean with air or
wire.
Flaw on installing
surface, residual
gasket Remove with oil
stone or replace
part.
Crack Replace part.
Bearing Unsmooth rotation Replace.
Streak, pitting, flaw,
crack
Replace.
Bushing, thrust
washer Flaw, burr, wear,
burning
Replace.
Oil seal, gasket Flawed or
hardened seal ring
Replace.
Worn seal ring on
its periphery or side Replace.
Piston seal ring, oil
seal, gasket, etc. Replace.
Gear Flaw, burr Replace.
Worn gear tooth Replace.
Splined part Burr, flaw, torsion Correct with oil
stone or replace.
Snap ring Wear, flaw,
distortion
Replace.
No interference Replace.
Thread Burr Replace.
Damage Replace.
Sp rin g Settling, sign of
burning Replace.
Friction plate Wear, burning,
distortion,
damaged claw Replace.
Separator plate,
retaining plate Wear, burning,
distortion,
damaged claw
Replace.
Sealing surface
(where lip
contacts) Flaw, rough
surface, stepped
wear, foreign
material
Replace.

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.