2003 DAEWOO MATIZ check engine

1F–298 ENGINE CONTROLS
DAEWOO M-150 BL2
Rough, Unstable, or Incorrect Idle, Stalling (Cont’d)
StepActionValue(s)YesNo
12
Is the long term fuel trim reading below the value
specified?
–20%
Go to
“Diagnostic Aids
for DTC P0172”
Go to Step 13
13
Is the long term fuel trim reading above the value
specified?
25%
Go to
“Diagnostic Aids
for DTC P0171”
–
14
1. Disconnect all of the fuel injector harness
connectors at the fuel injectors.
2. Connect an injector test light between the
harness terminals of each fuel injector connector.
3. Note the test light while cranking the engine.
Does the test light blink for all of the fuel injectors?
–
Go to Step 16Go to Step 15
15
1. Repair or replace the faulty injector drive circuit
harness, the connector, or the connector
terminals as needed.
2. If the harness, the connectors, and the terminals
are OK, replace the Engine Control Module
(ECM).
Is the repair complete?
–
System OK
–
16
Measure the resistance of each of the fuel injectors.
Is the resistance within the value specified (the
resistance will increase slightly at higher
temperatures)?
11.6–12.4 ΩGo to Step 18Go to Step 17
17
Replace any fuel injectors with a resistance that is
out of specifications.
Is the repair complete?
–
System OK
–
18Perform an injector diagnosis.
Is the problem found?–Go to Step 19Go to Step 20
19Replace any leaking or restricted fuel injectors.
Is the repair complete?–System OK–
20
1. With the engine OFF, disconnect the fuel
pressure regulator vacuum hose.
2. Thoroughly inspect the fuel pressure regulator
vacuum port and the fuel pressure regulator
vacuum hose for the presence of fuel.
Is the problem found?
–
Go to Step 21Go to Step 22
21Replace the fuel pressure regulator as needed.
Is the repair complete?–System OK–
22
1. Check the ignition system output voltage for all of
the cylinders using a spark tester.
2. Inspect the spark plugs for excessive wear,
insulation cracks, improper gap, or heavy
deposits.
3. Inspect the ignition wires for cracking, hardness,
or improper connections.
4. Replace any ignition wires with a resistance over
the value specified.
Is the problem found?
30000 ΩGo to Step 23Go to Step 24
23
Repair or replace any ignition system components
as needed.
Is the repair complete?
–
System OK
–

ENGINE CONTROLS 1F–299
DAEWOO M-150 BL2
Rough, Unstable, or Incorrect Idle, Stalling (Cont’d)
StepActionValue(s)YesNo
24
1. Inspect for vacuum leaks.
2. Check for proper Positive Crankcase Ventilation
(PCV) operation.
3. Check the Idle Air Control (IAC) valve operation.
4. Inspect the ECM ground connections.
Is the problem found?
–
Go to Step 25Go to Step 26
25Repair or replace any components as needed.
Is the repair complete?–System OK–
26
1. Check the Electric Exhaust Gas Recirculation
(EEGR) valve for proper operation.
2. Inspect the battery cables and the ground straps
for proper connections.
3. Check the generator voltage output. Repair or
replace the generator if the voltage output is not
within the value specified.
Is the problem found?
12–16 VGo to Step 27Go to Step 28
27Repair or replace any components as needed.
Is the repair complete?–System OK–
28
1. Inspect for broken engine mounts.
2. Check for proper valve timing.
3. Perform a cylinder compression test.
4. Inspect for bent pushrods, worn rocker arms,
broken or weak valve springs, and a worn
camshaft.
5. Perform repairs as needed.
Are all of the checks and needed repairs complete?
–
System OK
–

1F–300 ENGINE CONTROLS
DAEWOO M-150 BL2
EXCESSIVE EXHAUST EMISSIONS OR ODORS
Definition: A vehicle fails an emission test. The vehicle
has an excessive rotten egg smell. Excessive odors do
not necessarily indicate excessive emissions.
StepActionValue(s)YesNo
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2
1. Run the engine until it reaches operating
temperature.
2. Perform an emission test.
Did the vehicle pass the emission test?
–
System OKGo to Step 3
3
1. Connect the scan tool to the Data Link Connector
(DLC).
2. Road test the vehicle.
3. Monitor the long term fuel trim memory.
Is the long term fuel trim memory within the value
specified?
–20 – 25 %Go to Step 6Go to Step 4
4
Is the long term fuel trim memory below the value
specified?
–20 %
Go to
“Diagnostic Aids
for DTC P0172”
Go to Step 5
5
Is the long term fuel trim memory above the value
specified?
25 %
Go to
“Diagnostic Aids
for DTC P0171”
–
6
1. Check for a properly installed fuel cap.
2. Check the fuel system pressure.
3. Perform an injector diagnosis.
Is the problem found?
–
Go to Step 7Go to Step 8
7
1. Repair or replace any fuel system components as
needed.
2. Perform an emission test.
Did the vehicle pass the emission test?
–
System OK
–
8
1. Check the ignition system for proper operation.
2. Inspect the spark plugs for excessive wear,
insulation cracks, improper gap, or heavy
deposits.
3. Check the ignition wires for cracking, hardness, or
improper connections.
Is the problem found?
–
Go to Step 9Go to Step 10
9
1. Repair or replace any ignition system components
as needed.
2. Perform an emission test.
Did the vehicle pass the emission test?
–
System OK
–

ENGINE CONTROLS 1F–301
DAEWOO M-150 BL2
Excessive Exhaust Emissions or Odors (Cont’d)
StepActionValue(s)YesNo
10
1. Inspect for vacuum leaks.
2. Inspect the catalytic converter for contamination.
3. Inspect for carbon buildup on the throttle body
and the throttle plate and inside the engine.
Remove with a top engine cleaner.
4. Check the Electric Exhaust Gas Recirculation
(EEGR) valve for not opening.
5. Check for proper Positive Crankcase Ventilation
(PCV) operation.
Are all checks and needed repairs complete?
–
System OK
–

1F–302 ENGINE CONTROLS
DAEWOO M-150 BL2
DIESELING, RUN-ON
Definition: An engine continues to run after the ignition
switch is turned OFF.
StepActionValue(s)YesNo
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2Does the engine run smoothly after the ignition
switch is turned OFF?–Go to Step 3Go to Step 4
3
1. Check the ignition switch and the ignition switch
adjustment.
2. Replace the ignition switch if needed.
Is the repair complete?
–
System OK
–
4
1. Check the evaporative emission system.
2. Check for leaking fuel injectors.
3. Check the Idle Air Control (IAC) valve operation.
4. Inspect for vacuum leaks.
5. Check for the proper base idle setting.
Are all checks and repairs complete?
–
System OK
–

ENGINE CONTROLS 1F–303
DAEWOO M-150 BL2
BACKFIRE
Definition: Fuel ignites in the intake manifold, or in the
exhaust system, making a loud popping noise.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. Inspect for crossed or crossfiring ignition wires.
2. Check the ignition system output voltage for all
cylinders using a spark tester.
3. Inspect the spark plugs for excessive wear,
burned electrodes, improper gap, or heavy
deposits.
Is the problem found?
–
Go to Step 3Go to Step 4
3
Repair or replace any ignition system components
as needed.
Is the repair complete?
–
System OK
–
4
1. Check the fuel system operation.
2. Check the fuel injectors by performing an injector
diagnosis.
Is the problem found?
–
Go to Step 5Go to Step 6
5
Repair or replace any fuel system components as
needed.
Is the repair complete?
–
System OK
–
6
1. Inspect the Electric Exhaust Gas Recirculation
(EEGR) gasket for a leak or a loose fit.
2. Check the EEGR valve for proper operation.
3. Inspect the intake manifold and the exhaust
manifold for a casting flash.
Is the problem found?
–
Go to Step 7Go to Step 8
7Repair or replace any components as needed.
Is the repair complete?–System OK–
8
1. Inspect the timing belt for proper installation and
tension.
2. Check the engine compression.
3. Inspect the intake manifold gasket and the
exhaust manifold gasket for leaks.
4. Check for sticking or leaking valves.
5. Repair or replace any components as needed.
Are all checks and corrections complete?
–
System OK
–

ENGINE CONTROLS 1F–305
DAEWOO M-150 BL2
D12F504A
3. Remove the fuel pump assembly from the tank.
Install the fuel pump lock ring remover/installer DW
140– 010A.
Turn the fuel tank lock ring counterclockwise (1).
D102F505
Remove the fuel pump assembly (2).
Remove the fuel pump gasket (3).
D102F506
Installation Procedure
1. Install in the reverse order of removal.
2. Perform an operational check of the fuel pump.
Perform an operational check of the ignition switch
ON the 2 seconds fuel pump operation.
D102F507
FUEL PRESSURE REGULATOR
Removal Procedure
Caution: The fuel system is under pressure. To
avoid fuel spillage and the risk of personal injury or
fire, it is necessary to relieve the fuel system pres-
sure before disconnecting the fuel lines.
1. Relieve the fuel system pressure after remove the
fuel pump assembly. Refer to “Fuel Pump” in this
section.

1F–306 ENGINE CONTROLS
DAEWOO M-150 BL2
D102F508
2. Remove the fuel pressure regulator from the fuel
pump.
Remove the retainer from the fuel pump assembly
(1).
Remove the fuel pressure regulator (2).
Check the O–ring seals for the damage or the rip.
Use a vacuum gauge to check the diaphram for
damage and the spring for operation.
D102F509
Installation Procedure
1. Install in the reverse order of removal.
Do not reuse the removed O–ring seals. Replace
the removed O–ring seals with the new ones.
D102F511
D102F510
FUEL FILTER
Removal Procedure
Caution: The fuel system is under pressure. To
avoid fuel spillage and the risk of personal injury or
fire, it is necessary to relieve the fuel system pres-
sure before disconnecting the fuel lines.
1. Relieve the fuel system pressure.
Refer to “Fuel Pump” in this section.
2. Remove the fuel filter from the fuel tank.
Disconnect the inlet/outlet fuel lines by pushing the
line connector lock and pulling off the hose of the
fuel filter tube (1).
Remove the screw from the retaining clamp (2).
Remove the fuel filter (3).