Ground DAEWOO LACETTI 2004 Service Repair Manual

FRONT SUSPENSION 2C – 25
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
FRONT SUSPENSION
The front suspension for this vehicle is a combination of
a strut assembly and a knuckle assembly. The strut as-
sembly combines a strut dampener and spring mounted
to the body of the vehicle. The upper end of the strut is iso-
lated by a rubber mount and contains a bearing to allow the
strut to turn. The knuckle is attached to the strut assembly
and pivots on a ball joint bolted to the control arm. The con-
trol arms pivot from the body using rubber bushings.
The ball joint is fastened to the steering knuckle with a
pinch bolt and nut, and to the lower control arm with rivets.
The stabilizer bar interconnects both strut assemblies ofthe vehicle through the stabilizer link and is attached to the
front suspension crossmember. Jounce and rebound
movements affecting one wheel are partially transmitted
to the opposite wheel of the vehicle to stabilize body roll.
When servicing the control arm–to–body attachment and
the stabilizer shaft–to–body insulators, make sure the at-
taching bolts are loose until the control arms are moved to
the trim height, which is curb height. Trim height is the nor-
mal position to which the control arms move when the ve-
hicle is sitting on the ground. Refer to ”General Specifica-
tions” in this section.
The springs in the front suspension of engine family II are
stronger and the strut dampeners heavier than are the
springs and strut dampeners found in the front suspension
of engine family I.

2E – 10ITIRES AND WHEELS
DAEWOO V–121 BL4
turers of tire chains have a specific chain size for each tire
size to ensure a proper fit when the chain is installed. Be
sure to purchase the correct chains for the tires on which
they are to be used. Use rubber adjusters to take up any
slack or clearance in loose chains.
Use of chains may adversely affect vehicle handling.
When tire chains are installed, follow these precautions:
S Adjust speed to road conditions.
S Avoid sharp turns.
S Avoid locked–wheel braking.
To prevent chain damage to the vehicle, install the chains
on the front tires as tightly as possible. Tighten them again
after driving 0.4 to 0.8 kilometer (0.3 to 0.5 mile). The use
of chains on the rear tires is not recommended because
they may contact the vehicle and possibly damage it. If
chains must be used on the rear tires, be sure there is suffi-
cient clearance between the chains and the body. Do not
exceed 70 km/h (45 mph) or the chain manufacturer’s
speed limit, if lower. Avoid large bumps, potholes, severe
turns and any other maneuvers which could cause the
tires to bounce. Follow any other instructions of the chain
manufacturer which do not disagree with the above in-
structions.
REPLACEMENT TIRES
A tire performance criteria (TPC) specification number is
molded in the sidewall near the tire size of all original
equipment tires. This specification number assures that
the tire meets performance standards for traction, endur-
ance, dimensions, noise, handling and rolling resis–tance.
Usually a specific TPC number is assigned to each tire
size.
CAUTION : Do not mix different types of tires on the
same vehicle such as radial, bias and bias–belted
tires except in emergencies, because vehicle han-
dling may be seriously affected and may result in loss
of control.
Use only replacement tires with the same size, load range,
and construction as the original. The use of any other tire
size or construction type may seriously affect ride, han-
dling, speedometer/odometer calibration, vehicle ground
clearance, and tire clearance to the body and the chassis.
This does not apply to the spare tire furnished with the ve-
hicle.
It is recommended that new tires be installed in pairs on
the same axle.
If it is necessary to replace only one tire, pair it with the tire
having the most tread to equalize the braking action.
Although they may appear different in tread design, tires
built by different manufacturers with identical TPC specifi-
cations may be used on the same vehicle.
ALL SEASON TIRES
Most vehicles are now equipped with steel–belted all sea-
son radial tires as standard equipment. These tires qualify
as snow tires, with a 37 percent higher average rating for
snow traction than the non–all season radial tires pre-
viously used. Other performance areas, such as wet trac-
tion, rolling resistance, tread life, and air retention, have
also been improved. This was done by improvements in
both tread design and tread compounds. These tires are
identified by an ”M + S” molded in the tire sidewall following
the size number. The suffix ”MS” is also molded in the side-
wall after the TPC specification number.
The optional handling tires used on some vehicles are not
all season tires. These will not have the ”MS” marking after
the tire size or the TPC specification number.
PASSENGER METRIC SIZED TIRES
All Daewoo vehicles now use Passenger (P) metric sized
tires. P–metric tires are available in two load ranges: stan-
dard load (35 psi maximum) and extra load (41 psi maxi-
mum). Most passenger vehicle tires are standard load.
Most P–metric tire sizes do not have exact corresponding
alphanumeric tire sizes. For example, a P175/70R13 is
not exactly equal in size and load–carrying capacity to an
FR70–13. For this reason, replacement tires should be of
the same TPC specification number as the originals. If P–
metric tires must be replaced with other sizes, consult a
tire dealer. Tire companies can best recommend the clos-
est match of alphanumeric to P–metric sizes within their
own tire lines.
The metric term for measuring tire inflation pressure is the
kilopascal (kPa). Tire pressure may be printed in both kPa
and psi. One psi equals 6.895 kPa.
See the tire label or refer to ”Tire Size and Pressure Speci-
fications” in this section for tire inflation pressures.
TIRE LABEL
The tire label is permanently located on the rear face of the
driver’s door and should be referred to for tire information.
It lists the maximum vehicle load, the tire size (including
the spare tire), and the cold inflation pressure (including
the spare tire).
SPARE TIRE
The notchback and the wagon come equipped with a full–
sized tire on a steel wheel. The hatchback comes
equipped with a reduced–sized temporary tire on a steel
wheel.
WHEELS
Wheels must be replaced if they are bent, dented, have
excessive lateral or radial runout, leak air through welds,
have elongated bolt holes, or if the wheel bolts won’t stay
tight or are heavily rusted. Wheels with excessive runout
may cause vehicle vibration. Replacement wheels must
be equivalent to the original equipment wheels in load ca-

TIRES AND WHEELS 2E – 11
DAEWOO V–121 BL4
pacity, diameter, rim width, offset, and mounting configu-
ration. A wheel of improper size or type may affect wheel
and bearing life, brake cooling, speedometer/odometer
calibration, vehicle ground clearance, and tire clearance
to the body and the chassis. The wheel offset is 49 ± 1 mm
(1.93 ± 0.04 inches). Steel wheels may be identified by a
two– or three–letter code stamped into the rim near the
valve stem. Alloy wheels should have the code, the part
number, and the manufacturer ID cast into the back side.
INFLATION O TIRES
The pressure recommended for any vehicle line is careful-
ly calculated to give a satisfactory ride, handling, tread life,
and load–carrying capacity.
Tire pressure should be checked monthly or before any
extended trip. Check the tires when they are cold, after the
vehicle has sat for 3 hours or more, or has been driven less
than 1 mile. Set the tire pressure to the specifications on
the tire label located on the rear face of the driver’s door.
Tire inflation pressure is also given under ”Tire Size and
Pressure Specifications” in this section.
Valve caps or extensions should be on the valves to keep
dust and water out.
For sustained driving at speeds up to 140 km/h (85 mph),
inflate the tires to the pressure recommended on the tire.
Sustained driving at speeds faster than 140 km/h (85mph), even if permitted by law, is not advised unless the
vehicle has special high–speed tires available from many
tire dealers. Tire pressures may increase as much as 41
kPa (6 psi) when the tires are hot.
Higher than recommended tire pressure can cause
S Hard ride.
S Tire bruising or damage.
S Rapid tread wear at the center of the tire.
Lower than recommended pressure can cause
S Tire squeal on turns.
S Hard steering.
S Rapid and uneven wear on the edges of the tread.
S Tire rim bruises and rupture.
S Tire cord breakage.
S High tire temperatures.
Unequal tire pressures on same axle can cause
S Uneven braking.
S Steering lead.
S Reduced handling.
S Swerve on acceleration.
S Torque steer.

4A – 6IHYDRAULIC BRAKES
DAEWOO V–121 BL4
STOP LAMP WARNING CIRCUIT DIAGNOSIS
J3B14A03
10A30
F4
32
A19
A13 A14 A1 A2B15 C201
31C201IP/Fuse
Block C201
C202
C110C108 S301 WHT
BRN
BRN
Parking
Brake
SwitchBrake
Fluid
Switch
BLKBRN LT GRN
DK
GRN
DK
GRN LT GRN/
BLK
LT GRN/
BLKPPL/
WHT
PPL/
WHT
PPL/
WHTPPL/
WHT PPL/
WHT
PPL/
WHT ABS
Warning
Lamp TCS
Active
Warning
Lamp Parking
Brake
Warning
Lamp Charging
Warning
Hot in Run and Start
PNK
Cluster PNK
EBCM”L” Ter.
Generator 1 12
2
20 2222 16 41 13
3
4
11 1 215
8
21
G303
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
1. When the ignition is turned ON, the brake warning
lamp should initially illuminate and then dim for ABS
equipped vehicles. This is done as a bulb check.
On vehicles that are not equipped with ABS, the
brake warning lamp should only illuminate when
either the brake fluid reservoir is low or the parking
brake is applied.
7. The brake fluid level switch is a normally open
switch. If the brake warning lamp is off after discon-
necting the switch, the brake fluid level switch is
stuck closed.9. If the brake warning lamp is still on after discon-
necting the parking brake switch, there is a short to
ground in the wire to the parking brake switch.
12. If the other checks have been properly performed
and the brake warning lamp is off after disconnect-
ing the electronic brake control module (EBCM) J1
connector, the EBCM is faulty.
19. If the brake warning lamp does not operate while
performing any of the functions, the fault should be
in the ignition feed to the circuit.
24. This step determines if the problem is in the ignition
feed to the circuit or in the instrument cluster.
30. The brake warning lamp should illuminate when
jumpering the parking brake connector to ground.
32. If the brake warning lamp is on after jumpering the
brake fluid level switch terminals, the switch is
faulty.

HYDRAULIC BRAKES 4A – 7
DAEWOO V–121 BL4
Stop Lamp Warning Circuit Diagnosis
StepActionValue(s)YesNo
1Turn the ignition ON.
Is the brake warning lamp always on?–Go to Step 2Go to Step 18
2Check the ABS warning lamp.
Is the ABS warning lamp also on?–Go to Step 3Go to Step 4
3Use a scan tool to check for diagnostic trouble codes
(DTCs) and follow the procedures for any DTCs
found.
Is the lamp still on?–Go to Step 4System OK
4Release the parking brake fully.
Is the lamp off?–System OKGo to Step 5
5Check the brake fluid level.
Is the fluid level OK?–Go to Step 7Go to Step 6
61. Fill the brake fluid reservoir with clean DOT 3
equivalent hydraulic fluid.
2. Replace the cap on the fluid reservoir.
Is the lamp on?– Go to Step 7System OK
7Disconnect the harness connector from the brake
fluid level switch.
Is the lamp on?–Go to Step 9Go to Step 8
8Replace the brake fluid level switch.
Is the repair complete?–System OK–
91. Connect the brake fluid level switch.
2. Disconnect the parking brake switch.
Is the lamp on?–Go to Step 11Go to Step 10
10Replace the parking brake switch.
Is the repair complete?–System OK–
11Connect the parking brake switch.
Is the vehicle equipped with ABS?–Go to Step 12Go to Step 14
121. Turn the ignition OFF.
2. Disconnect the electronic brake control module
(EBCM) connector.
3. Turn the ignition ON.
Is the lamp on?–Go to Step 14Go to Step 13
13Replace the electronic brake control module
(EBCM).
Is the repair complete?–System OK–
141. Turn the ignition OFF.
2. Connect the EBCM connector.
3. Check for a short to ground in the wiring be-
tween the instrument cluster terminal A19(B15)
and the brake fluid level switch.
Is the problem found?–Go to Step 17Go to Step 15
15Check for a short to ground in the wiring between the
instrument cluster terminal A19(B15) and the park-
ing brake switch.
Is the problem found?–Go to Step 17Go to Step 16

4A – 8IHYDRAULIC BRAKES
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
16Check for a short to ground in the wiring between the
instrument cluster terminal A19(B15) and the EBCM
connector terminal 21.
Is the problem found?–Go to Step 17Go to Step 18
17Repair the wiring as needed.
Is the repair complete?–System OK–
18Check the brake lamp after doing each of the follow-
ing functions:
S Apply the parking brake.
S Remove the cap from the brake fluid reservoir.
S On vehicles equipped with ABS, command the
lamp on using a scan tool.
Does the brake warning lamp operate for all of these
conditions?–System OKGo to Step 19
19When the operations listed in step 18 were per-
formed, the brake warning lamp did not function.
Did the brake warning lamp fail to light for all of the
operations listed in step 18?–Go to Step 20Go to Step 27
201. Turn the ignition OFF.
2. Inspect the kick panel fuse F4.
Is the fuse OK?–Go to Step 22Go to Step 21
21Replace the fuse.
Is the repair complete?–System OK–
22Inspect the brake warning lamp bulb.
Is the bulb OK?–Go to Step 24Go to Step 23
23Replace the bulb.
Is the repair complete?–System OK–
241. Disconnect the instrument cluster connector.
2. Turn the ignition ON.
3. Measure the voltage at the instrument cluster
connector terminal A19(B15).
Does the voltage measure within the value speci-
fied?11–14 vGo to Step 25Go to Step 26
251. Turn the ignition OFF.
2. Repair the open in the instrument cluster.
Is the repair complete?–System OK–
261. Turn the ignition OFF.
2. Repair the open in the wiring between the in-
strument cluster connector terminal A19(B15)
and the ignition switch.
Is the repair complete?–System OK–
27Apply the parking brake again.
Does the parking brake warning lamp operate with
the parking brake applied?–Go to Step 28Go to Step 30
28Remove the brake fluid reservoir cap.
Does the parking brake warning lamp operate with
the cap from the brake fluid reservoir removed?–Go to Step 29Go to Step 32
29Check for an open between the instrument cluster
connector terminal A1 and the EBCM connector ter-
minal 21.
Is the problem found?–Go to Step 17Go to Step 13

HYDRAULIC BRAKES 4A – 9
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
301. Turn the ignition ON.
2. Disconnect the parking brake switch.
3. Jumper the parking brake switch connector
terminal to ground.
Is the lamp on?–Go to Step 10Go to Step 31
311. Turn the ignition OFF.
2. Repair the open in the wire between the instru-
ment cluster connector terminal A1 and the
parking brake switch connector terminal.
3. Is the repair complete?
Is the repair complete?–System OK–
321. Disconnect the brake fluid level switch.
2. Turn the ignition ON.
3. Jumper the brake fluid level switch connector
terminals.
Is the lamp on?–Go to Step 8Go to Step 33
331. Turn the ignition OFF.
2. Connect a test light between battery positive
and the BRN/WHT wire terminal of the brake
fluid level switch.
Is the test light on?–Go to Step 34Go to Step 35
34Repair the open in the wiring between ground and
the brake fluid level switch.
Is the repair complete?–System OK–
35Repair the open in the wiring between the instrument
cluster connector terminal A1 and the brake fluid lev-
el switch.
Is the repair complete?–System OK–

ANTILOCK BRAKE SYSTEM 4F – 3
DAEWOO V–121 BL4
SCHEMATIC AND ROUTING DIAGRAMS
ABS SYSTEM CIRCUIT (I)
1
12
2
C111 1 2 2
E B C M
19
16 1418
B+
B+1576 54
G106
10A
62C202 BRN
BRN
BRN
BRN
BRNF11
Hot in Run and Start
6C110 C107 C107
40 C202
60A
1
6C105
C102
RED ORN/
BLK
RED RED
RED
Ground IGN+
Ground LT B L U Brake
Switch2
4Ef215AEf13
Hot at All Times
4330
C201 C201
J3B14F01
11
11
S301
2 WHT GRYGRY
WHT GRY
WHT PPL
YEL
WHTWHT
RED
BRN BRN
BLK BLK
DK
BLUBRN LT
BLU
1
21 4 5
10 89 3
31
C110
43
12
C30214C202
LT B L U LT B L U LT B L U
LT B L U
RR/LH
Wheel Speed SensorRR/RH BLK/WHT
G106
BLK
61
C201
76
C201
17
Oil feeding
Connector
”2”Ter
Oil feeding
Connector
”4”Ter
FRT/LHWheel Speed Sensor
FRT/RH
1C110

ANTILOCK BRAKE SYSTEM 4F – 5
DAEWOO V–121 BL4
EBCM CONNECTOR FACE VIEW
EBCM Connector
PinColorCircuit
1WHTRight Rear Ground
2BRNRight Rear Sensor
3PPLRight Front Ground
4–Not Used
5YELRight Front Sensor
6WHTLeft Front Ground
7ORNLeft Front Sensor
8REDLeft Rear Ground
9BLKLeft Rear Sensor
10–Not Used
11DK BLU/
WHTData Link Connector
(DLC)
12–Not Used
13–Not Used
14YELBrake Lamp Switch
15PNKSwitched Ignition
16BLKMotor Ground
PinColorCircuit
17REDBattery
18REDBattery
19BLK/WHTInstrument Ground
20LT GRNABS Warning Lamp
21BRN/WHTEBD Warning Lamp
(Parking Brake Lamp)
22–Not Used
23–Not Used
24–Not Used
25–WSS Output Signal
26–Not Used
27–Not Used
28–Not Used
29–Not Used
30–Not Used
31–Not Used
SB–Shorting Bar

4F – 8IANTILOCK BRAKE SYSTEM
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
31. Turn the ignition switch to LOCK for 10 sec-
onds.
2. Turn the ignition switch to ON and observe the
ABS indicator.
Does the indicator light for 4 seconds and then go
off?–Go to Step 5Go to Step 4
4Check the ABS indicator.
Did the ABS indicator turn on and stay on?–Go to ”ABS In-
dicator Lamp Il-
luminated
Constantly”Go to ”ABS In-
dicator Lamp
Inoperative”
51. Turn the ignition switch to LOCK for 10 sec-
onds.
2. Turn the ignition switch to ON and observe the
parking brake / EBD indicator.
Does the indicator light for 4 seconds and then go
off?–Go to Step 12Go to ”EBD
System Indica-
tor Lamp Inop-
erative”
61. Turn the ignition switch to LOCK.
2. Disconnect the EBCM harness connector.
3. Turn the ignition switch to ON.
4. Use a digital voltmeter (DVM) to measure the
voltage from ground to terminal 15, 17, and 18
of EBCM harness connector.
Is the voltage within the specified value on each ter-
minal?11–14 vGo to Step 7Go to ”Power
Supply to Con-
trol Module, No
DTCs Stored”
71. Turn the ignition switch to LOCK.
2. Use a DVM to measure the resistance from the
EBCM harness connector, terminals 16 and 19
to ground.
Is the resistance equal to the specified value?
0 WGo to Step 9Go to Step 8
8Repair the open in the circuit BLK and BLK/WHT
that failed.
Is the repair complete?–System OK–
9Use a DVM to measure the resistance between ter-
minal 11 of the EBCM harness connector and termi-
nal 12 of the Data Link Connector (DLC). Is the re-
sistance below the specified value?2 WGo to Step 10Go to Step 11
10Replace the ABS unit assembly.
Is the repair complete?–System OK–
11Repair the open or high resistance in circuit DK BLU
between terminal 11 of the EBCM harness connec-
tor and terminal 12 of the DLC jack.
Is the repair complete?–Go to Step 1–
12Perform the road test described above.
Are any DTCs set?–Go to the table
for the DTC–