length DAEWOO LACETTI 2004 Service Owner's Manual

ANTILOCK BRAKE SYSTEM 4F – 71
DAEWOO V–121 BL4
TIRES AND ABS/EBD
Replacement Tires
Tire size is important for proper performance of the ABS
system. Replacement tires should be the same size, load
range, and construction as the original tires. Replace tires
in axle sets and only with tires of the same tire perfor-
mance criteria (TPC) specification number. Use of any
other size or type may seriously affect the ABS operation.
TIRES AND ABS/EBD
Notice : There is no serviceable or removable EEPROM.
The EBCM must be replaced as an assembly.
The EBCM is attached to the hydraulic unit in the engine
compartment. The controlling element of ABS 5.3 is a mi-
croprocessor–based EBCM. Inputs to the system include
the four wheel speed sensors, the stoplamp switch, the
ignition switch, and the unswitched battery voltage. There
is an output to a bi–directional serial data link, located in
pin K of Data Link Connector (DLC) for service diagnostic
tools and assembly plant testing.
The EBCM monitors the speed of each wheel. If any wheel
begins to approach lockup and the brake switch is closed
(brake pedal depressed), the EBCM controls the sole-
noids to reduce brake pressure to the wheel approaching
lockup. Once the wheel regains traction, brake pressure
is increased until the wheel again begins to approach lock-
up. This cycle repeats until either the vehicle comes to a
stop, the brake pedal is released, or no wheels approach
lockup.
Additionally, the EBCM monitors itself, each input (except
the serial data link), and each output for proper operation.
If it detects any system malfunction, the EBCM will store
a DTC in nonvolatile memory (EEPROM) (DTCs will not
disappear if the battery is disconnected). Refer to ”Self
Diagnostics” in this section for more detailed information.
FRONT WHEEL SPEED SENSOR
The front wheel speed sensors are of a variable reluctance
type. Each sensor is attached to the steering knuckle,
close to a toothed ring. The result, as teeth pass by the
sensor, is an AC voltage with a frequency proportional to
the speed of the wheel. The magnitude of the voltage and
frequency increase with increasing speed. The sensor is
not repairable, nor is the air gap adjustable.
FRONT WHEEL SPEED SENSOR
RINGS
The toothed ring mentioned above is pressed onto the
wheel–side (outer) constant velocity joint. Each ring con-
tains 47 equally spaced teeth. Exercise care during ser-
vice procedures to avoid prying or contacting this ring. Ex-cessive contact may cause damage to one or more teeth.
If the ring is damaged, the wheel–side constant velocity
joint must be replaced.
REAR WHEEL SPEED SENSOR AND
RINGS
The rear wheel speed sensors operate in the same man-
ner as the front wheel speed sensors. They incorporate a
length of flexible harness with the connector attached to
the end of the harness. The rear wheel speed rings are in-
corporated into the hub assemblies and cannot be re-
placed separately, but require replacement of the rear
hub/bearing assembly.
VALUE RELAY AND PUMP MOTOR
RELAY
The valve relay and the motor pump relay are located in-
side the electronic brake control module (EBCM) and are
not replaceable. If one should fail, replace the EBCM.
WIRING HARNESS
The wiring harness is the mechanism by which the elec-
tronic brake control module (EBCM) is electrically con-
nected to power and to ground, to the wheel speed sen-
sors, the fuses, the switches, the indicators, and the serial
communications port. The components, considered part
of the wiring harness, are the wires that provide electrical
interconnection, and connectors (terminals, pins, con-
tacts, or lugs) that provide an electrical/mechanical inter-
face from the wire to a system component.
INDICATORS
The electronic brake control module (EBCM) continuously
monitors itself and the other ABS components. If the
EBCM detects a problem with the system, the amber ABS
indicator will light continuously to alert the driver to the
problem. An illuminated ABS indicator indicates that the
ABS system has detected a problem that affects the op-
eration of ABS. No antilock braking will be available. Nor-
mal, non–antilock brake performance will remain. In order
to regain ABS braking ability, the ABS must be serviced.
The red BRAKE indicator will be illuminated when the sys-
tem detects a low brake fluid level in the master cylinder
or when the parking brake switch is closed (the parking
brake is engaged) or EBD system is diabled.
WARNING : EBD INDICATOR LAMP WIRING IS CON-
NECTED TO THE PARKING BRAKE LAMP. IF THE
PARKING BRAKE LAMP IS TURNED ON WHEN YOU
DRIVING, CHECKING ON WHETHER THE PARKING
BRAKE LEVER IS ENAGED OR THE BRAKE FLUID
LEVEL IS LOW. IF THE SYSTEM HAS NO PROBLEM,
THE EBD SYSTEM IS WORKING IMPROPERLY. THE
EBD SYSTEM MUST BE SERVICED.

PARKING BRAKE 4G – 3
DAEWOO V–121 BL4
7. Inspect and replace any parts of doubtful strength
or quality. This can be shown by discoloration from
heat or stress.
8. Using a vernier caliper, adjust the shoe assembly to
167.6 to 167.8 mm (6.60 to 6.61 inches) by turning
the adjuster nut clockwise to increase the diameter.
Measure the shoe assembly diameter as closely as
possible to the center of the lining material.
9. Inspect and install the rotors and calipers. Refer to
Section 4E1, Rear Disc Brakes.
10. Install the parking brake cable to the backplate le-
ver on each side of the vehicle.
11. In the vehicle cabin, pull on the parking brake han-
dle. Stop after hearing two clicks.
12. Turn the rear wheel by hand until the wheel begins
to drag.
13. Release the parking brake.
14. Turn the rear wheel by hand to check the drag. Re-
adjust the cable, if necessary.
15. Repeat the process for the other rear wheel.
16. Lower the vehicle.
PARKING BRAKE LEVER
Removal Procedure
1. Release the parking brake.
2. Remove the parking brake/gearshift console hood.
Refer to Section 9G, Interior Trim.
3. Measure the thread length from the end of the pull
rod to the hex nut.
4. Remove the hex nut.
5. Remove the parking brake warning lamp switch.
Notice : The parking brake switch should be replaced if
the BRAKE warning light in the instrument panel cluster
did not glow when the parking brake was applied with the
ignition switch ON.

5A2 – 30IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
Manual Shifting Test
Manual shifting test is to determine whether failure symp-
tom is within electrical failure or mechanical failure.
1. Disconnect wire harness of shift solenoid, check
the range and gear positions correspond with below
table when driving by manual shifting.
Range
Gear
D3rd gear
RReverse
Notice : Make sure to disconnect only wire harness of shift
solenoid.
UNIT INSPECTION
Drive Plate Deflection
S Inspect drive plate deflection if within standard
value.
Standard Value
within 0.2mm (0.008 in)
Action :
Standard value is not within the specified value, replace
drive plate.
When ”abnormal wear” or ”stick” on torque converter
sleeve or oil pump is found, replace torque converter and
A/T.
Notice :
S When assembling torque converter and drive plate.
Be sure to use correct bolt with correct length. The
bolt pushes up torque converter front cover, and it
damages lock–up clutch lining. As a result, it cause
major failure ”No move”.
S Do not tighten the bolts by using impact wrench.
Cooler Pipe Bending and Choke
S Inspect it whether there is abnormal pipe bending in
the cooler pipe, pipe deformation and small cross–
section area of pipe line.
Action : Replace failure parts.S Apply compressed air of 2kg/cm
2 from cooler pipe
inlet side, inspect whether there is not cooler pipe
choke by confirming air flow smooth.
Action : Remove foreign particles and clean inside of pipe
line.
Normal
Vehicle Speed Sensor
1. Remove the connector of vehicle speed sensor,
connect 12V power supply and voltmeter to the ter-
minal.(Do not mistake polarity)
2. Check voltage change from approx. 0V to 12V with
vehicle speed sensor driven gear rotated.
Notice : The voltage change should be 4 times for 1 revo-
lution of the vehicle speed sensor driven gear.
Action : If the result of inspection is bad, replace the ve-
hicle speed sensor.

AISIN AUTOMATIC TRANSAXLE 5A2 – 137
DAEWOO V–121 BL4
MAJOR COMPONENT ASSEMBLY
Tools Required
DW240–020 Brake/Clutch Spring Compressor
DW240–050 Overdrive Brake Adapter
DW240–060–01 Brake Spring Compressor Bolt/Nut
DW240–060–02 Brake Spring Compressor Plate
DW240–070 1st / Reverse Brake Adapter
DW240–100 Counter Drive Gear Installation Adapter
DW240–130 Differential Preload Adapter
DW260–031–01 Transaxle Housing Oil Seal Installer
DW260–031–02 Transaxle Case Oil Seal Installer
DW260–041 Planetary Ring Gear Nut Removal/Installa-
tion Socket
DW240–160 Transaxle Case Outer Tapered Roller Bear-
ing Race Adapter
DW240–140 Transaxle Housing Side Bearing Outer Race
Adapter
DW240–170 Adapter Handle
Assembly Procedure
1. Install 4 new O–rings to the 4 screw plugs.
2. Install the 4 screw plugs with the O–rings to the
transaxle rear cover.
Tighten
Tighten the screw plugs to 7.4 NSm (65 lb–in).
3. Install the 2 seal rings to the transaxle rear cover.
4. Using the vernier calipers, measure the free length
of the O/D brake piston return spring together with
the spring seat.
S Standard free length : 18.99 mm (0.7476 in.)

AISIN AUTOMATIC TRANSAXLE 5A2 – 143
DAEWOO V–121 BL4
If the preload of counter driven gear does not satisfy the
specification, select the adjuster shim from the table below
and remeasure the valve. Until the valve is within the spec-
ification, repeat the procedure.
Notice : When the preload is larger than the specification,
select a thinner adjuster shim. When the preload is smaller
than specification, select a thicker adjuster shim.
S Adjuster shim thickness: mm (in.)
Mark
ThicknessMarkThickness
11.70 (0.0669)G2.17 (0.0854)
21.75 (0.0689)H2.20 (0.0866)
31.80 (0.0709)K2.25 (0.0886)
41.85 (0.0728)L2.30 (0.0906)
51.90 (0.0748)M2.35 (0.0925)
61.93 (0.0760)N2.40 (0.0945)
71.96 (0.0772)P2.45 (0.0965)
A1.99 (0.0783)Q2.50 (0.0984)
B2.02 (0.0795)R2.55 (0.1004)
C2.05 (0.0807)S2.60 (0.1024)
D2.08 (0.0819)U2.65 (0.1043)
E2.11 (0.0831)W2.70(0.1063)
F2.14 (0.0843)––
30. Using the vernier calipers, measure the free length
of the 1st & reverse brake piston return spring to-
gether with spring seat.
S Standard free length: 18.053 mm (0.71075 in.)
31. Check to see if the sliding surface of the disc, plate
and flange of 1st & reverse brake are worn or burnt.
If necessary, replace them.
Notice : If the lining of the disc is peeling off or discolored,
or even if a part of the groove is defaced, replace all discs.
Notice : Before assembling new discs, soak them in ATF
for at least 15 minutes.

5A2 – 150IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
59. Check that the planetary gear turns freely counter-
clockwise and locks clockwise.
60. Install the anti–rattle clip in the place shown in the
illustration (the space between the No.2 one–way
clutch outer race and transaxle case), push the
anti–rattle clip in until you hear the ”click”.
61. Using vernier calipers, measure the free length of
the 2nd brake piston return spring together with
spring seat.
S Standard free length: 15.85 mm (0.6240 in.).
62. Check to see if the sliding surface of the disc, plate
and flange of 2nd brake are worn or burnt. If neces-
sary, replace them.
Notice : If the lining of the disc is peeling off or discolored,
or even if a part of the groove is defaced, replace all discs.
Notice : Before assembling new discs, soak them in ATF
for at least 15 minutes.

AISIN AUTOMATIC TRANSAXLE 5A2 – 161
DAEWOO V–121 BL4
109. Coat new 6 O–rings with ATF and install them
to the pistons.
110. Coat the 3 springs and 3 accumulator pistons
with ATF, install them to the holes.
S Accumulator spring:
Spring
Free length
Outer
diameter
mm(in.)Color
B1(O/D & 2nd
brake)47.13(1.8555)/
16.0(0.630)Pink
C1(Forward
clutch)57.90(2.2795)/
17.2(0.677)–
C2(Direct
clutch)57.20(2.2520)/
17.5(0.689)Green
111. Coat a new apply gasket with ATF, install it to
the transaxle case.
112. Coat a new brake drum gasket with ATF, install
it to the transaxle case.
113. Install the spring and check valve.

5A2 – 174IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
12. Remove the 2 seal rings from the input shaft.
Notice : Do not expand the ring ends excessively.
Inspection Procedure
1. Check to see if the sliding surface of the disc, plate
and flange are worm or burnt. If necessary, replace
them.
S If the lining of the disc is peeling off or discol-
ored, or even if a part of the printed number is
defaced, replace all discs.
S Before assembling new discs, soak them in ATF
for at least 15 minutes.
2. Using vernier calipers, measure the free length of
the direct clutch return spring together with the
spring sheet.
S Standard free length: 36.04 mm (1.4189 in.)
3. Check that the check ball is free by shaking the di-
rect clutch piston.
4. Check that the valve does not leak by applying low–
pressure compressed air.

AISIN AUTOMATIC TRANSAXLE 5A2 – 187
DAEWOO V–121 BL4
15. Using a small screwdriver, remove the O–ring from
the forward clutch drum.
16. Using a small screwdriver, remove the O–ring from
the intermediate shaft sub–assembly.
Inspection Procedure
1. Check to see if the sliding surface of the disc, plate
flange are worn or burnt. If necessary, replace
them.
S If the lining of the disc is peeling off or discol-
ored, or even if a part of the printed number is
defaced, replace all discs.
S Before assembling new discs, soak them in ATF
for at least 15 minutes.
2. Using vernier calipers, measure the free length of
the spring together with the spring seat.
S Standard free length: 24.04 mm (0.9465 in.)

5A2 – 200IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
7. Install the 2 gaskets, plate and lower valve body
cover.
8. First, tighten the bolts indicated by arrows tempo-
rarily and then tighten the other bolts temporarily.
9. Tighten all the bolts completely.
Tighten
Tighten the bolts to 11 NSm (97 lb–in).
S Bolt length:
Bolt A: 49 mm (1.93 in.)
Bolt B: 20 mm (0.79 in.)
Bolt C: 60 mm (2.36 in.)
10. Install the 5 shift solenoid valves with the 6 bolts.
Tighten
Tighten the bolts to 11 NSm (97 lb–in).
S Bolt length:
Bolt A: 49 mm (1.93 in.)
Bolt B: 20 mm (0.79 in.)
11. Install the manual valve.
12. Make sure that the primary regulator valve is posi-
tioned in the same place where it was removed.