2004 DAEWOO LACETTI driver

ENGINE CONTROLS 1F – 631
DAEWOO V–121 BL4
S Barometric Pressure (BARO)
S Intake Air Temperature (IAT)
S Throttle Position (TP)
S High canister purge
S Fuel trim
S A/C on
Trip
Technically, a trip is a key–on run key–off cycle in which all
the enable criteria for a given diagnostic are met, allowing
the diagnostic to run. Unfortunately, this concept is not
quite that simple. A trip is official when all the enable crite-
ria for a given diagnostic are met. But because the enable
criteria vary from one diagnostic to another, the definition
of trip varies as well. Some diagnostics are run when the
vehicle is at operating temperature, some when the ve-
hicle first starts up; some require that the vehicle be cruis-
ing at a steady highway speed, some run only when the
vehicle is at idle; some diagnostics function with the
Torque Converter Clutch (TCC) disabled. Some run only
immediately following a cold engine startup.
A trip then, is defined as a key–on run key–off cycle in
which the vehicle was operated in such a way as to satisfy
the enables criteria for a given diagnostic, and this diag-
nostic will consider this cycle to be one trip. However,
another diagnostic with a different set of enable criteria
(which were not met) during this driving event, would not
consider it a trip. No trip will occur for that particular diag-
nostic until the vehicle is driven in such a way as to meet
all the enable criteria
Diagnostic Information
The diagnostic charts and functional checks are designed
to locate a faulty circuit or component through a process
of logical decisions. The charts are prepared with the re-
quirement that the vehicle functioned correctly at the time
of assembly and that there are not multiple faults present.
There is a continuous self–diagnosis on certain control
functions. This diagnostic capability is complimented by
the diagnostic procedures contained in this manual. The
language of communicating the source of the malfunction
is a system of diagnostic trouble codes. When a malfunc-
tion is detected by the control module, a diagnostic trouble
code is set and the Malfunction Indicator Lamp (MIL) is illu-
minated.
Malfunction Indicator Lamp (MIL)
The Malfunction Indicator Lamp (MIL) is required by On–
Board Diagnostics (EOBD) that it illuminates under a strict
set of guide lines.
Basically, the MIL is turned on when the engine control
module (ECM) detects a DTC that will impact the vehicle
emissions.The MIL is under the control of the Diagnostic Executive.
The MIL will be turned on if an emissions–related diagnos-
tic test indicates a malfunction has occurred. It will stay on
until the system or component passes the same test, for
three consecutive trips, with no emissions related faults.
Extinguishing the MIL
When the MIL is on, the Diagnostic Executive will turn off
the MIL after three consecutive trips that a ”test passed”
has been reported for the diagnostic test that originally
caused the MIL to illuminate. Although the MIL has been
turned off, the DTC will remain in the ECM memory (both
Freeze Frame and Failure Records) until forty (40) warm–
up cycles after no faults have been completed.
If the MIL was set by either a fuel trim or misfire–related
DTC, additional requirements must be met. In addition to
the requirements stated in the previous paragraph, these
requirements are as follows:
S The diagnostic tests that are passed must occur
with 375 rpm of the rpm data stored at the time the
last test failed.
S Plus or minus ten percent of the engine load that
was stored at the time the last test failed. Similar
engine temperature conditions (warmed up or
warming up) as those stored at the time the last
test failed.
Meeting these requirements ensures that the fault which
turned on the MIL has been corrected.
The MIL is on the instrument panel and has the following
functions:
S It informs the driver that a fault that affects vehicle
emission levels has occurred and that the vehicle
should be taken for service as soon as possible.
S As a system check, the MIL will come on with the
key ON and the engine not running. When the en-
gine is started, the MIL will turn OFF.
S When the MIL remains ON while the engine is run-
ning, or when a malfunction is suspected due to a
driveability or emissions problem, an EOBD System
Check must be performed. The procedures for
these checks are given in EOBD System Check.
These checks will expose faults which may not be
detected if other diagnostics are performed first.
Data Link Connector (DLC)
The provision for communicating with the control module
is the Data Link Connector (DLC). The DLC is used to con-
nect to a scan tool. Some common uses of the scan tool
are listed below:
S Identifying stored DTCs.
S Clearing DTCs.
S Performing output control tests.
S Reading serial data.

POSITION OF CONNECTORS AND GROUNDSW2–3
2) CONNECTOR INFORMATION
Connector
Number
Te r m i n a l
NumberColorConnecting Wiring
HarnessConnector Position
C10121 PinWhiteBody
Engine Fuse BlockEngine Fuse Block
C10211 P i nWhiteBody
Engine Fuse BlockEngine Fuse Block
C10310 PinWhiteEngine
Engine Fuse BlockEngine Fuse Block
C10424 PinWhiteFront
Engine Fuse BlockEngine Fuse Block
C1054 PinWhiteBody
Engine Fuse BlockEngine Fuse Block
C10620 PinWhiteEngine
Engine Fuse BlockEngine Fuse Block
C1072 PinWhiteABS
Engine Fuse BlockEngine Fuse Block
C10824 PinBlackBody
EngineLeft Engine Fuse Block
C1094 PinWhiteEngine
FrontUnder Engine Fuse Block
C11012 PinWhiteABS
BodyBelow Engine Fuse Block
C 1112 PinBlackABS
FrontBelow Engine Fuse Block
C1122 PinBlackFront – HornCenter Cross Member Panel
C11316 PinBlackBody
FrontBehind ECM Bracket
C20176 PinBlackI.P
I.P Fuse BlockI.P Fuse Block
C20289 PinWhiteI.P
BodyLeft CO–Driver Leg Room
C2048 PinWhiteRoof
Body (W/O Rain Sensor)Left CO–Driver Leg Room
C20414 PinWhiteRoof
Body(W/ Rain Sensor)Left CO–Driver Leg Room
C20622 PinWhiteI.P
TCMUpper Driver Leg Room
C2076 PinWhiteAir Bag
I.PUpper Left Driver Leg Room
C20815 PinWhiteI.P
FAT CBehind Glove Box
C20920 PinBlackFAT C
FAT C . A u xBetween Heater Core and
Evaporator Core
C2106 PinWhiteI.P
ConsoleBelow Console Box
C3018 PinWhiteAir Bag
BodyFront SDM
C3024 PinBlackRR. ABS
BodyCenter Rear Cross Member
C35133 PinGrayBody
Front Light DoorUnder CO–Driver A Pillar
C36133 PinGrayBody
Front Right DoorUnder Driver A Pillar
C37112 PinWhiteBody
Rear Light DoorUnder Left B Pillar
C38112 PinWhiteBody
Rear Right DoorUnder Right B Pillar
C401 (N/B)8 PinWhiteTrunk
BodyInside Right Trunk Side Cover
C401 (H/B)6 PinWhiteTrunk
BodyInside Right Trunk Side Cover
C4026 PinWhiteTrunk LID
BodyInside Right Trunk Side Cover
C4036 PinWhiteT/Gate. EXT. – BodyInside Left C Pillar
C4048 PinWhiteT/Gate. EXT. – BodyInside Left C Pillar
C4058 PinWhiteT/Gate. EXT. – T/GateBeside Left Rear Wiper Motor
C4066 PinWhiteT/Gate. EXT. – T/GateBeside Left Rear Wiper Motor
3) GROUND INFORMATION
Ground Number
Wiring HarnessGround Position
G101FrontBehind Left Head Lamp
G102FrontBehind Right Head Lamp
G103BatteryLeft Battery
G104EngineUnder Start Motor
G105BatteryUnder Start Motor
G106ABSBelow EBCM
G107Engine(MR–140/HV–240)Under Start Motor
G201I.PLeft I/P Fuse Block
G202Air BagBehind Left Audio Bracket
G203I.PBehind Left Audio Bracket
G205RoofUpper Driver Leg Room
G301BodyBelow Driver Cross Member Floor Panel
G302BodyBelow Left C Pillar
G303BodyBelow Left CO–Driver Leg Room
G401TrunkCenter Trunk Lower Back Panel
G402T/Gate. EXT.Inside Driver C Pillar
4) SPLICE PACK INFORMATION
Splice Pack Number
ColorWiring HarnessGround Position
S101BlackEngine(MR–140/HV–240)Upper Transmission
S202BlackI.PBehind Cluster
S203RedI.PBehind Audio Mounting
S204MagentaI.PBehind Audio Mounting
S205OrangeTCM (MR–140/HV–240)Upper Driver Leg Room
S301BlueBodyLeft CO–Driver Leg Room
S302BrownBodyLeft CO–Driver Leg Room

2B – 2IWHEEL ALIGNMENT
DAEWOO V–121 BL4
DIAGNOSIS
TIRE DIAGNOSIS
Irregular and Premature Wear
Irregular and premature tire wear has many causes. Some
of them are incorrect inflation pressures, lack of regular
rotation, poor driving habits, or improper wheel alignment.
If the wheel alignment is reset because of tire wear, always
reset the toe as close to zero degrees as the specification
allows. Refer to ”Rear Toe Adjustment” in this section.
Rotate the tires if:
S The front tire wear is different from the rear.
S The left and right front tire wear is unequal.
S The left and right rear tire wear is unequal.
Check wheel alignment if:
S The left and right front tire wear is unequal.
S The wear is uneven across the tread of either front
tire.
S The front tire treads are scuffed with ”feather”
edges on the side of the tread ribs or blocks.
Tread Wear Indicators
The original equipment tires have built–in tread wear indi-
cators to show when the tires need replacement. These in-
dicators appear as bands when the tire tread depth be-
comes shallow. Tire replacement is recommended when
the indicators appear in three or more grooves at six loca-
tions.
Radial Tire Waddle
Waddle is side–to–side movement at the front or rear of
the vehicle. It is caused by the steel belt not being straight
within the tire, or by excessive lateral runout of the tire or
wheel. It is most noticeable at low speeds, 8 to 48 km/h (5
to 30 mph), but may appear as ride roughness at 80 to 113
km/h (50 to 70 mph).
The vehicle must be road tested to determine which end
of the vehicle has the faulty tire. The rear end of the vehicle
will shake from side to side or ”waddle” if the waddle tire
is on the rear of the vehicle. From the driver’s seat, it feels
as though someone is pushing on the side of the vehicle.
If the faulty tire is on the front of the vehicle, the waddle is
more visual. The front sheet metal appears to be moving
back and forth, and the driver’s seat feels like the pivot
point in the vehicle.
Waddle can be diagnosed using the method of substi–tut-
ing known good tire and wheel assemblies on the problem
vehicle.
1. Road test the vehicle to determine if the waddle is
coming from the front or the rear of the vehicle.
2. Install good tires and wheels from a similar vehicle
in place of those on the offending end of the prob-
lem vehicle. If the source of the waddle is not ob-
vious, change the rear tires.
3. Road test the vehicle. If there is improvement,
install the original tires to find the offending tire. If
there is no improvement, install good tires in place
of all four offending tires.

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.

4–4WUSAGE AND CAPACITY OF FUSES IN FUSE BLOCK
3. POSITION OF CONTROL UNIT, RELAY AND PART NUMBER
1) ENGINE FUSE BLOCK
Part Name
Part No.Remarks
Front Fog Relay96190187
ILLUM. Relay96190187
Cooling Fan Low Relay96190189
Cooling Fan HI Relay96190189
A/C Comp. Relay96190187
Horn Relay96190187
Defog Relay96190189
Fuel Relay96190189
Main/Ignition Relay96190189
Power Window Relay96190189
Head Lamp Relay96190189
2) BEHIND DRIVER LEG ROOM CONNECTOR HOLDER
Part Name
Part No.Remarks
Rear Fog Relay96344573
PNP Relay96190189
Blink Unit96312545
Blower Relay96190189
3) DRIVER LEG ROOM
Part Name
Part No.Remarks
Chime Bell96459510
TCM (MR–140/HV–240)96342619
TCM (SIRIUS D4)96497032
4) BEHIND LEFT HEAD LAMP
Part Name
Part No.Remarks
Cooling Fan Control Relay96251271
5) UNDER LEFT PASSENGER LEG ROOM
Part Name
Part No.Remarks
Central Door Lock Unit96552824
6) FLOOR PANEL BELOW CONSOLE
Part Name
Part No.Remarks
Anti Theft Control Unit96407681Wes t Euro
96404668General
SDM96406712
7) BESIDE ENGINE FUSE BLOCK
Part Name
Part No.Remarks
EBCM96549742

4A – 16IHYDRAULIC BRAKES
DAEWOO V–121 BL4
BRAKE PEDAL
(Left–Hand Drive Shown, Right–Hand Drive
Similar)
Removal Procedure
1. Remove the instrument panel. Refer to Section 9E,
Instrumentation/Driver Information.
2. Remove the nuts from the brace.
3. Remove the brake pedal.
Installation Procedure
1. Install the brace with nuts.
Tighten
Tighten the brace with nuts to 22 NSm (16 lb–ft).
2. Install the brake pedal.
3. Install the instrument panel. Refer to Section 9E,
Instrumentation/Driver Information.

MASTER CYLINDER 4B – 5
DAEWOO V–121 BL4
2. For vehicles with the manual transaxle, disconnect
the clip to the clutch hose connection to the master
cylinder, and move the clip out of the way.
3. Remove the clutch hose from the master cylinder.
4. Gently pry upwards with a screwdriver to release
the reservoir.
5. Tilt the reservoir and pull it upward in order to re-
move it.
6. Remove the reservoir seals from the master cylin-
der body.
Installation Procedure
1. Lubricate the new seals with clean brake fluid.
Install the seals into the cylinder body.
2. Install the reservoir on the master cylinder body.
3. For vehicles with the manual transaxle, connect the
clip to the clutch hose connection to the master cyl-
inder.