2003 DAEWOO MATIZ position

ENGINE CONTROLS 1F–297
DAEWOO M-150 BL2
ROUGH, UNSTABLE, OR INCORRECT IDLE, STALLING
Definition: The engine runs unevenly at idle. If the condi-
tion is bad enough, the vehicle may shake. Also, the idle
varies in rpm (called “hunting”). Either condition may be
severe enough to cause stalling. The engine idles at in-
correct idle speed.Important: Before diagnosing the symptom, check ser-
vice bulletins for updates.
StepActionValue(s)YesNo
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2
1. Connect the scan tool to the Data Link Connector
(DLC).
2. Monitor the oxygen sensor (O2S) reading at
different throttle positions.
Does the O2S change quickly from rich to lean at
the different throttle positions?
–
Go to Step 5Go to Step 3
3
Check the O2S for contamination from fuel or
improper use of room temperature vulcanizing
sealant.
Is the O2S contaminated?
–
Go to Step 4Go to Step 5
4Replace the contaminated O2S as needed.
Is the repair complete?–System OK–
5
1. Check for a sticking throttle shaft or binding
throttle linkage that may cause incorrect Throttle
Position (TP) sensor voltage.
2. Check the TP sensor voltage reading with the
throttle closed.
Is the TP sensor voltage within the value specified?
0.4–0.8 VGo to Step 6
Go to
“Diagnostic
Aids for DTC
P0123”
6
1. Check the Engine Coolant Temperature (ECT)
sensor voltage reading using the scan tool.
2. Compare the ECT sensor reading with the
ambient temperature when the engine is cold.
Does the ECT sensor temperature reading differ
from the ambient temperature by more than the
value specified?
3
C (5
F)Go to Step 7Go to Step 9
7
Check for high resistance in the ECT sensor circuit
or the sensor itself.
Is the problem found?
–
Go to Step 8Go to Step 9
8
Replace the ECT sensor or repair the circuit as
needed.
Is the repair complete?
–
System OK
–
9
Check the Manifold Absolute Pressure (MAP)
sensor for response and accuracy.
Is the problem found?
–
Go to Step 10Go to Step 11
10
Replace the MAP sensor or repair the MAP sensor
circuit as needed.
Is the repair complete?
–
System OK
–
11
1. Road test the vehicle at the speed of the
complaint.
2. Monitor the long term fuel trim reading using the
scan tool.
Is the long term fuel trim reading within the value
specified?
–20–25%Go to Step 14Go to Step 12

ENGINE CONTROLS 1F–311
DAEWOO M-150 BL2
MAA1F450
2. Remove the MAP sensor.
Remove the bolts (1).
Remove the MAP sensor with bracket (2).
MAA1F460
Installatin Procedure
1. Install in the reverse order of removal.
Inspect the MAP sensor vacuum hose for the tear
and damages.
2. Install the MAP sensor with the bolts and nuts.
Tighten
Tighten the MAP sensor bolts/nuts to 8–12 Nm
(71–106 lb-in).
Tighten the MAP sensor bracket bolt to 8–12 Nm
(71–106 lb-in).
D102F537
THROTTLE BODY
Removal Procedure
1. Remove the air cleaner/resonator assembly and air
intake tube. Refer to Section 1B, SOHC Engine Me-
chanical.
2. Drain the engine coolant. Refer to Section 1D, Engine
Cooling.
D102F538
3. Disconnect the throttle cable, the throttle position
sensor and the idle air control valve connectors.
Open the throttle valve (1).
Disconnect the throttle cable (2).
Disconnect the idle air control valve connector (3).
Disconnect the throttle position sensor connector
(4).

1F–316 ENGINE CONTROLS
DAEWOO M-150 BL2
D21F010
Installation Procedure
1. Install the knock sensor with the bolt.
Tighten
Tighten the knock sensor retaining bolt to 15–25 Nm
(11–18 lb-ft).
2. Connect the electrical connector to the knock sensor.
3. Install the starter. Refer to Section 1E, Engine Electri-
cal.
4. Connect the negative battery cable.
MAA1F490
ELECTRONIC IGNITION (EI) SYSTEM
IGNITION COIL
Removal Procedure
1. Disconnect the negative battery cable.
2. Note the ignition wire location and disconnect the
ignition wires from the EI system ignition coil.
3. Disconnect the EI system ignition coil connector.
4. Remove the EI system ignition coil retaining bolts.
5. Remove the EI system ignition coil.
MAA1F500
Installation Procedure
1. Install the EI system ignition coil.
2. Tighten the EI system ignition coil to 8–12 Nm
(71–106 lb-in).
UAA1F2C0
CRANKSHAFT POSITION (CKP)
SENSOR
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the air cleaner assembly.
3. Disconnect the crankshaft position (CKP) sensor
connector.
4. Remove the CKP sensor retaining bolt.

ENGINE CONTROLS 1F–317
DAEWOO M-150 BL2
MAA1F550
Installation Procedure
1. Install the CKP sensor.
2. Tighten the CKP sensor retaining bolt to 5–8 Nm
(44–71 lb-in).
UAA1F2E0
CAMSHAFT POSITION (CMP)
SENSOR
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the camshaft position (CMP) sensor con-
nector.
3. Remove the CMP sensor retaining bolt.
4. Remove the CMP sensor.
MAA1F540
Installation Procedure
1. Install the CMP sensor.
2. Tighten the CMP sensor retaining bolt to 10–14 Nm
(89–124 lb-in).
MAA1F510
ENGINE CONTROL MODULE (ECM)
Removal Procedure
1. Disconnect the ECM connector.

ENGINE CONTROLS 1F–319
DAEWOO M-150 BL2
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
ApplicationNmLb-FtLb-In
Camshaft Position Sensor Bolts10–14–89–124
Engine Coolant Temperature (ECT) Sensor8–12–71–106
Crankshaft Position (CKP) Sensor Retaining Bolt5–8–44–71
Electronic Ignition (EI) System Ignition Coil Retaining
Bolts8–12–71–106
Evaporative Emission Canister Protective Cover8–71
Electric Exhaust Gas Recirculation (EEGR) Valve
Retaining Bolts20–3015–22–
Fuel Rail Retaining Bolts18–2213–16–
Fuel Tank Strap Retaining Nuts18–2213–16–
Knock Sensor Bolt15–2511–18–
Intake Air Temperature (IAT) Sensor20–3015–22–
Manifold Absolute Pressure (MAP) Sensor Retaining
Bolt8–12–71–106
Oxygen Sensor35–4426–33–
Heated Oxygen Sensor35–4426–33–
Throttle Body Retaining Bolt9–12–80–106
ECM Mounting Bolts6–8–53–71
SPECIAL TOOLS
SPECIAL TOOLS TABLE
D102F101
Scan Tool
D12F102A
DW–140–010A
Fuel Pump Lock Ring
Remover/Installer

1G – 2 ENGINE EXHAUST
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
EXHAUST SYSTEM
Notice: When you are inspecting or replacing exhaust
system components, make sure there is adequate clear-
ance from all points on the underbody to avoid possible
overheating of the floor pan and possible damage to the
passenger compartment insulation and trim materials.
Check the complete exhaust system and the nearby
body areas and tailgate for broken, damaged, missing or
mispositioned parts, open seams, holes, loose connec-
tions or other deterioration which could permit exhaust
fumes to seep into the luggage or passenger compart-
ment. Dust or water in the luggage may be an indication
of a problem in one of these areas. Any defects should
be corrected immediately.
MUFFLER
The muffler reduces the temperature, pressure, and
noise of the exhaust gas.
Aside from the exhaust manifold connection, the ex-
haust system uses a flange and seal joint design op-
posed to a slip joint coupling design with clamp. If holes,
open seams or any deterioration is discovered upon in-
spection of the front muffler and pipe assembly, thecomplete assembly should be replaced. The same pro-
cedure is applicable to the rear muffler assembly.
Heat shields in the front and rear muffler assembly posi-
tions, as well as for the catalytic converter and front ex-
haust pipe, protect the vehicle and the environment from
high temperatures the exhaust system develops.
CATALYTIC CONVERTER
Notice: When jacking or lifting the vehicle from the body
side rails, be certain that the lift pads do not contact the
catalytic converter as this could damage the catalytic
converter.
Notice: The catalytic converter requires the use of un-
leaded fuel only, or damage to the catalyst will result.
The catalytic converter is an emission control device
added to the exhaust system to reduce pollutants from
the exhaust pipes.
The oxidation catalyst is coated with a catalytic material
containing platinum and palladium, which reduces levels
of hydrocarbon (HC) and carbon monoxide (CO) from
the exhaust gas. The three-way catalyst has coatings
which contain platinum and rhodium, which additionally
lower the levels of oxides of nitrogen (NOx).

2A–4 SUSPENSION DIAGNOSIS
DAEWOO M-150 BL2
Condition Probable Cause Correction
Abnormal Noise, Front
A loose stabilizer shaft link.
Tighten the stabilizer shaft link.
Suspension
Loose wheel nuts.
Tighten the wheel nuts.

Loose suspension bolts or nuts.
Tighten the suspension bolts or the
nuts.

Loose wheel covers.
Tighten the wheel covers.

Worn strut dampeners or strut
mountings.
Replace the strut dampeners.

Tighten the strut mounting nuts.

An improperly positioned strut spring.
Adjust the strut spring to the proper
position.
Wander or Poor
Mismatched or uneven tires.
Replace the tires.
Steering Ability
Worn strut dampeners.
Replace the strut dampeners.

A loose stabilizer shaft link.
Tighten the stabilizer shaft link.

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

The steering preload adjustment is
out–of–adjustment.
Perform a rack bearing preload
on–vehicle adjustment.

The front–wheel and the rear–wheel
alignment are out–of–align.
Align the front and the rear end
wheels.
Erratic Steering when
Worn or loose wheel bearings.
Replace the wheel bearings.
Braking
A broken or a sagging coil spring.
Replace the coil spring.

A leaking caliper.
Replace the caliper.

Warped rotors.
Replace the rotors.

An incorrect or an uneven caster.
If the caster is beyond specifications,
check the frame and repair it as
needed.
Low or Uneven Trim
A broken or a sagging coil spring.
Replace the coil spring.
Height
An overloaded vehicle.
Maintain the proper load weight.

An incorrect or weak coil spring.
Replace the coil spring.
Ride Too Soft
Worn strut dampeners.
Replace the strut dampeners.

A broken or a sagging coil spring.
Replace the coil spring.
Ride Too Harsh
Incorrect strut dampeners.
Replace the strut dampeners.

An incorrect coil spring.
Replace the coil spring.
Body Leans or Sways
A loose stabilizer shaft link.
Tighten the stabilizer shaft link.
in Corners
Worn strut dampeners or strut
mountings.
Replace the strut dampeners.

Tighten the strut assembly mounting
nuts.

an overloaded vehicle.
Maintain the proper load weight.

A broken or a sagging coil spring.
Replace the coil spring.
Suspension Bottoms
Worn strut dampeners.
Replace the strut dampeners.

An overloaded vehicle.
Maintain the proper load weight.

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

WHEEL ALIGNMENT 2B–3
DAEWOO M-150 BL2
STEERING AXIS INCLINATION
Steering Axis Inclination (SAI) is the tilt at the top of the
steering knuckle from the vertical. Measure the SAI
angle from the true vertical to a line through the center of
the strut and the lower ball joint as viewed from the front
of the vehicle.
SAI helps the vehicle track straight down the road and
assists the wheel back into the straight ahead position.
SAI on front wheel drive vehicles should be negative.
INCLUDED ANGLE
The included angle is the angle measured from the cam-
ber angle to the line through the center of the strut and
the lower ball joints as viewed from the front of the ve-
hicle.
The included angle is calculated in degrees Most align-
ment racks will not measure the included angle directly.
To determine the included angle, subtract the negativeor add the positive camber readings to the Steering Axis
Inclination (SAI).
SCRUB RADIUS
The scrub radius is the distance between true vertical
and the line through the center of the strut and lower ball
joint to the road surface. Scrub radius is bulit into the de-
sign of the vehicle. Scrub radius is not adjustable.
SETBACK
The setback is the distance in which one front hub and
bearing assembly may be rearward of the other front
hub and bearing assembly. Setback is primarily caused
by a road hazard or vehicle collision.
TURNING ANGLE
The turning angle is the angle of each front wheel to the
vertical when the vehicle is making a turn.