2003 DAEWOO MATIZ brake

1F–106 ENGINE CONTROLS
DAEWOO M-150 BL2
DIAGNOSTIC TROUBLE CODE (DTC) – P0171 FUEL TRIM SYSTEM TOO LEAN
System Description
To provide the best possible combination of driveability,
fuel economy, and emission control, a Closed Loop air/
fuel metering system is used. While in Closed Loop, the
Engine Control Module (ECM) monitors the oxygen sen-
sor (O2S) signal voltage and adjusts fuel delivery based
on signal voltage. A change made to fuel delivery will be
indicated by the long and short term fuel trim values
which can be monitored with the scan tool. Ideal fuel trim
values are around 128 (0%). If the O2S signal is indicat-
ing a lean condition, the ECM will add fuel resulting in
fuel trim values above 128 (0% to 100%). If a rich condi-
tion is detected, the fuel trim values will be below 128
(0% to –100%), indicating that the ECM is reducing the
amount of fuel delivered. If exhaust emissions reach an
excessive level due to a lean or rich condition, a fuel trim
Diagnostic Trouble Code (DTC) is set.
Conditions for Setting the DTC

No intrusive tests active.

DTCs P0106, P0107, P0108, P0112, P0113, P0117,
P0118, P0122, P0123, P0125, P0131, P0132,
P0133, P0134, P0137, P0138, P0140, P0141,
P1167, P1171, P0201, P0202, P0203, P0204,
P0300, P0336, P0337, P0341, P0342, P0402,
P0404, P1404, P0405, P0406, P0443, P0506, and
P0507are not set.

The average of short term fuel trim value is greater
than or equal to 120.

Throttle Position (TP) is less than 95%.

Engine speed is between 700 and 6000 rpm.

Barometric Pressure (BARO) is greater than 92.0
kPa (10.4 psi).

Coolant temperature is between 80°C (176°F) and
11 5°C (239°F).

Manifold Absolute Pressure (MAP) is more than 90
kPa (10.2 psi).

System is in closed loop.

Adaptive index is ready.
Action Taken when the DTC Sets

Emission related.

“Armed” after two trip with a fail.

“Disarmed” after one trip with a pass.

MIL on if failure is detected in three consecutive trips.

Stores a History DTC on the third consecutive with a
fail (The DTC will be armed after the second fail).
Stores a Freeze Frame on the third consecutive trip
with a fail (if empty).
Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition
cycles in which the diagnostic runs without a fault.

A history DTC will clear after 40 consecutive warm up
cycles without a fault.

DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
Important: After repairs, use the scan tool Fuel Trim
Reset function to reset the long-term fuel trim to 128
(0%).

Fuel pressure – The system will be lean if the pres-
sure is too low. It may be necessary to monitor fuel
pressure while driving the vehicle at various road
speeds and/or loads to confirm.

Map sensor – An output that causes the ECM to
sense a lower than normal manifold pressure (high
vacuum) can cause the system to go lean. Discon-
necting the MAP sensor will allow the ECM to substi-
tute a fixed (default) value for the MAP sensor. If the
lean condition is gone when the sensor is discon-
nected, substitute a known good sensor and recheck.

Fuel contamination – Water, in even small amounts,
near the in-tank fuel pump inlet can be delivered to
the injector. The water causes a lean exhaust and
can set DTC P0171.
Check for poor O2S or MAP sensor connection at the
ECM. Inspect the harness connectors for the following
conditions:

Backed-out terminals

Improper mating

Broken locks

Improperly formed

Damaged terminals

Poor terminal-to-wire connection
Inspect the wiring harness for damage. If the harness
appears to be OK, observe the O2S display on the scan
tool while moving the connectors and the wiring harness
related to the engine harness. A change in the display
will indicate the location of the fault.
Check the brake power booster check valve for possible
leaks.

ENGINE CONTROLS 1F–247
DAEWOO M-150 BL2

Excessive engine overloading. Check for seized pul-
leys, pumps, or motors on the accessory drive,
Overweight engine oil.
DTC P0505 Idle Air Control Valve (IACV) Circuit Fault
StepActionValue(s)YesNo
1
Perform an On-Board Diagnostic (EOBD) System
Check.
Was the check performed?
–
Go to Step 2
Go to
“On-Board
Diagnostic
System Check”
2
1. Install a scan tool to the Data Link Connector
(DLC).
2. Operate the engine to idle speed.
3. Transmission in park or neutral and the parking
brake set.
4. A/C is off.
5. Using scan tool, command the Idle Air Control
(IAC) valve up and down between the specified
value.
Does the rpm change smoothly when he
commanded by the scan tool?
900–1200
rpm
Go to Step 3Go to Step 5
3
1. Turn the ignition OFF.
2. Disconnect the IAC valve connector.
3. Measure the resistance between terminal C and
D of the IAC valve.
4. Measure the resistance between terminal B and A
of the IAC valve.
Is the resistance within the specified value?
40–80 ΩGo to Step 4Go to Step 13
4
1. Measure the resistance between terminal D and
B of the IAC valve.
2. Measure the resistance between terminal C and
A of the IAC valve.
Is the resistance equal to the specified value?
∞Go to Step 15Go to Step 13
5
1. Turn the ignition OFF.
2. Disconnect the IAC valve connector.
3. Turn the ignition ON.
4. With test light connected to ground, probe the
IAC connector terminals.
Does the test light illuminate on D terminals?
–
Go to Step 6Go to Step 7
6
With test light connected to B+, probe the IAC
connector terminals.
Does the test light illuminate on D terminals?
–
Go to Step 8Go to Step 9
7
Check for an open or short to ground in the IAC high
and low circuits and repair as needed.
Is the repair complete?
–
Go to Step 15Go to Step 10
8
1. Idle the engine.
2. Connect a test light to ground, probe the IAC
connector terminals.
Does the test light flash On and OFF for all
terminals?
–
Go to Step 11Go to Step 12
9
Check for an open or a short to voltage in the IAC
valve high and low circuits and repair as needed.
Is the repair complete?
–
Go to Step 15Go to Step 10
10
Check the Engine control Module (ECM) connector
for poor connections and repair as needed.
Is the repair complete?
–
Go to Step 15Go to Step 14

1F–296 ENGINE CONTROLS
DAEWOO M-150 BL2
POOR FUEL ECONOMY
Definition: Fuel economy, as measured by an actual
road test, is noticeably lower than expected. Also, fuel
economy is noticeably lower than it was on this vehicle
at one time, as previously shown by an actual road test.
Important: Driving habits affect fuel economy. Check
the owner’s driving habits by asking the following ques-
tions:1. Is the A/C system (i.e. defroster mode) turned on all
the time?
2. Are the tires at the correct air pressure?
3. Have excessively heavy loads been carried?
4. Does the driver accelerate too much and too often?
Suggest the driver read the section in the owner’s
manual about fuel economy.
StepActionValue(s)YesNo
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2
1. Inspect the air filter for excessive contamination.
2. Inspect for fuel system leaks.
Are all needed checks complete?
–
Go to Step 3
–
3
1. Inspect the spark plugs for excessive wear,
insulation cracks, improper gap, or heavy
deposits.
2. Replace any faulty spark plugs.
3. Inspect the ignition wires for cracking, hardness,
and proper connections.
Are all needed checks and repairs complete?
–
Go to Step 4
–
4
1. Inspect the engine coolant level.
2. Check the thermostat for being always open or for
an incorrect heat range.
3. Replace the thermostat as needed.
Are all needed checks and repairs complete?
–
Go to Step 4
–
5
1. Check the transaxle shift pattern. Ensure all
transaxle gears are functioning.
2. Check for proper calibration of the speedometer.
3. Check the brakes for dragging.
4. Check the cylinder compression.
5. Repair, replace, or adjust any components as
needed.
Are all checks and needed repairs complete?
–
System OK
–

2A–2 SUSPENSION DIAGNOSIS
DAEWOO M-150 BL2
Condition Probable Cause Correction
Car Lead/Pull
Mismatched or uneven tires.
Replace the tires.

A broken or a sagging coil spring.
Replace the coil spring.

A improperly radial tire lateral force.
Check the wheel alignment.

Switch the tire and wheel assemblies.

Replace the tires as needed.

The front–wheel alignment is
out–of–align.
Align the front wheels.

Off–center steering gear.
Reseat the pinion valve assembly.

Replace the pinion valve assembly as
needed.

Front–brake dragging.
Adjust the front brakes.
Abnormal or Excessive
Tire Wear
The front–wheel and rear–wheel
alignment is out–of–align.
Align the front and the rear wheels.

Excessive toe.
Adjust the toe.

A broken or a sagging coil spring.
Replace the coil spring.

Out–of–balance tires.
Balance the tires.

Worn strut dampeners.
Replace the strut dampeners.

A failure to rotate tires.
Rotate the tires.

Replace the tires as needed.

Overloaded vehicle.
Maintain the proper load weight.

Low tire inflation.
Inflate the tires to the proper pressure.
Scuffed Tires
Incorrect toe.
Adjust the toe.

A twisted or a bent suspension arm.
Replace the suspension arm.
Wheel Tramp
An out–of–balance tire or wheel.
Balance the tire or the wheel.

Improper strut dampener action.
Replace the strut dampeners.
Shimmy, Shake, or
An out–of–balance tire or wheel.
Balance the tire or the wheel.
Vibration
Excessive wheel hub runout.
Measure the hub flange runout.

Replace the hub as needed.

Excessive brake drum or brake rotor
imbalance.
Adjust the brakes.

Replace the brake rotor or the brake
drum as needed.

Worn tie rod ends.
Replace the tie rod ends.

Wheel trim imbalance.
Balance the wheel.

A worn ball joint.
Replace the control arm and ball joint
assembly.

Excessive wheel runout.
Measure the wheel runout.

Replace the wheel as needed.

Excessive loaded radial runout on the
tire and wheel assembly.
Match–mount the tire and wheel
assembly.

FRONT SUSPENSION 2C–7
DAEWOO M-150 BL2
REPAIR INSTRUCTIONS
ON–VEHICLE SERVICE
D16B501A
STRUT ASSEMBLY
Removal Procedure
1. Open the hood.
2. Remove the top of the strut assembly at passenger
seat side.

For vehicle with power steering, remove the power
steering fluid reservoir (1).

Remove the nuts (2).
D16B502A
3. Remove the top of the strut assembly at driver side.

Remove the bolt and the fuse box (1, 2).

Remove the nuts (3).
D106B503
4. Remove the lower of the strut assembly.

Raise and suitably support the vehicle.

Remove the wheel. Refer to Section 2E, Tires and
Wheels.

Remove the ABS front speed sensor electrical wire
from the bracket, if applicable (1).

Disconnect the brake hose from the bracket (2).

Remove the strut bracket bolts (3).
5. Remove the strut bracket assembly from the vehicle.

2C –8 FRONT SUSPENSION
DAEWOO M-150 BL2
D16B504A
70–90 Nm
Installation Procedure
1. Install the strut assembly to the vehicle with the strut
assembly–to–strut bracket bolts.
Tighten
Tighten the strut assembly–to–strut bracket bolts to
70–90 Nm (52–66 lb-ft).
2. Connect the brake hose to the bracket.
3. Install the ABS front speed sensor electrical wire to
the bracket, if applicable.
D16B505A
18–28 Nm
18–28 Nm4. Install the wheel. Refer to Section 2E, Tires and
Wheels.
5. Lower the vehicle.
6. Install the nuts.

Install the nuts at passenger side (1).
Tighten
Tighten the nuts to 18–28 Nm (13–21 lb-ft).

Install the nuts at driver side (2).
Tighten
Tighten the nuts to 18–28 Nm (13–21 lb-ft).
7. Install the power steering fluid reservoir.
8. Install the fuse box and bolt.
D106B506
KNUCKLE ASSEMBLY
Tools Required
KM 507–B Ball Joint Remover
Removal Procedure
1. Remove the caulking nut.

Straighten the bent flange caulking nut (1).

Remove the caulking nut (2).

Remove the washer (3).
2. Remove the wheel. Refer to Section 2E, Tires and
Wheels.
D105B501
3. Separate the tie rod end from the knuckle assembly.

Remove the cotter pin (1).

Remove the castellated nut (2).

Install the ball joint remover KM 507–B.

Separate the tie rod end from the knuckle assem-
bly using a ball joint remover KM 507–B (3).

FRONT SUSPENSION 2C–9
DAEWOO M-150 BL2
D106B507
4. Remove the control arm from the knuckle assembly.

Remove the stud bolt (1).

Separate the control arm from the knuckle assem-
bly (2).
D106B508
5. Remove the brake caliper from the knuckle assembly.
Refer to Section 4D, Front Disc Brakes.
6. Remove the ABS wheel speed sensor from the
knuckle assembly, if applicable. Refer to Section 4F,
Anti–lock Brake System.
7. Remove the steering knuckle assembly from the ve-
hicle.

Remove the strut bracket bolts (1).

Separate the knuckle assembly from the drive
shaft by pulling the steering knuckle assembly (2).
D16B509A
70–90 Nm
50–70 Nm
Installation Procedure
1. Install in the reverse order of removal.
2. Install the steering knuckle assembly in the vehicle
with strut bracket bolts (1).
Tighten
Tighten the strut bracket bolts to 70–90 Nm (52–66
lb-ft).
3. Install the brake caliper from the knuckle assembly.
4. Install the control arm into the knuckle assembly with
the stud bolt (2).
Tighten
Tighten the stud bolt to 50–70 Nm (36–52 lb-ft).
D16B510B
5. Install the tie rod end to the knuckle assembly.
6. Install the tie rod end–to–knuckle castellated nut (1)
and the cotter pin.
Tighten
Tighten the castellated nut to 30–55 Nm (22–41 lb-
ft).
7. Install the caulking nut (2).

Bend the caulking nut flange (3).
Tighten
Tighten the caulking nut to 210 Nm (155 lb-ft).

2C –16 FRONT SUSPENSION
DAEWOO M-150 BL2
UNIT REPAIR
D106B701
HUB BEARING AND KNUCKLE
Tools Required
DW 220–020A–01 Differential Bearing Puller.
DW 220–020A–04 Differential Bearing Plate Adapter.
DW 340–010 Front Wheel Hub Remover.
DW 340–020 Front Wheel Bearing Race Installer.
DW 340–030 Front Wheel Bearing Installer.
09940–71430 Front Spring Compressor.
Disassembly Procedure
1. Remove the steering knuckle assembly. Refer to
“Knuckle Assembly” in this section.
2. Remove the bolts from the wheel hub.
D106B702
3. Remove the wheel hub from the knuckle assembly
using the front wheel hub remover DW 340–010.

Remove the wheel hub using the front wheel hub
remover DW 340–010 (1).

Remove the bearing spacer (2).

Remove the brake rotor (3).