2003 DAEWOO MATIZ Service Repair Manual

ENGINE CONTROLS 1F–207
DAEWOO M-150 BL2
BLANK

1F–208 ENGINE CONTROLS
DAEWOO M-150 BL2
DIAGNOSTIC TROUBLE CODE (DTC) – P0420 CATALYST LOW EFFICIENCY
Circuit Description
In order to control exhaust emissions of Hydrocarbons
(HC), Carbon Monoxide (CO) and Nitrogen Oxide
(NOx), a Three-Way Catalytic Converter (TWC) is used.
The catalyst within the converter promotes a chemical
reaction which oxidizes the HC and CO present in the
exhaust gas, converting them into harmless water vapor
and carbon dioxide, it also reduces NOx, converting it
into nitrogen. The catalytic converter also has the ability
to store oxygen. The Engine Control Module (ECM) has
the capability to monitor this process using a Heated
Oxygen Sensor (HO2S) located in the exhaust stream
past the TWC. The HO2S produces an output signal
which indicates the oxygen storage capacity of the cata-
lyst; this in turn indicates the catalyst’s ability to convert
exhaust emissions effectively. The ECM monitors the
catalyst efficiency by first allowing the catalyst to heat
up, waiting for a stabilization period while the engine is
idling, and then adding and removing fuel while monitor-
ing the reaction of the HO2S. When the catalyst is func-
tioning properly, the HO2S response to the extra fuel is
slow compared to the Oxygen Sensor (O2S). When the
HO2S response is close to that of the O2S, the Oxygen
storage capability or efficiency of the catalyst is consid-
ered to be bad, and the Malfunction Indicator Lamp
(MIL) will illuminate.
Conditions for Setting the DTC

Oxygen Sensor Capacity test condition:

Closed loop stoichiometry.

Engine is running more than 300 seconds.

Airflow is between 25~50kg/h.

Engine Coolant Temperature (ECT) is more than
70°C(176°F) .

Engine speed between 2,400rpm and 3,000rpm.

Vehicle speed is between 64km/h(28.6mph) and
80km/h(49.7mph).
Note: Test is aborted for this idle if:

Change in engine speed is greater than 80 rpm.

A/C status changed.

Cooling fan status changed.
Insufficient air/fuel shift.

DTC(s) P0106, P0107, P0108, P0117, P0118,
P0122, P0123, P0125, P0131, P0132, P0133,
P1133, P0134, P1134, P0137, P0138, P0140,
P0141, P1167, P1171, P0171, P0172, P0201,
P0202, P0203, P0204, P0300, P0336, P0337,
P0341, P0342, P0351, P0352, P0402, P0404,
P0405, P0406, P0506, P0507, and P0562 are NOT
SET.
Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will illuminate.

The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Failure Records buffers.

A history DTC is stored.
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
The catalyst test may abort due to a change in the en-
gine load. Do not change the engine load (i.e. A/C, cool-
ant fan, heater motor) while a catalyst test is in progress.
An intermittent problem may be caused by a poor con-
nection, rubbed-through wire insulation, or a wire that is
broken inside the insulation.
Any circuitry, that is suspected as causing the intermit-
tent complaint, should be thoroughly checked for the fol-
lowing conditions:

Backed-out terminals

Improper mating

Broken locks

Improperly formed

Damaged terminals

Poor terminal-to-wire connection.

ENGINE CONTROLS 1F–209
DAEWOO M-150 BL2
DTC P0420 – Catalyst Low Efficiency
StepActionValue(s)YesNo
1
Perform an Euro 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. Turn the ignition ON.
Are any component Diagnostic Trouble Codes
(DTCs) set?
–Go to
Applicable DTC
table
Go to Step 3
3
1. Visually/physically check the following:
2. Exhaust system for a leak.
3. Heated Oxygen Sensor (HO2S).
Is a problem found?
–
Go to Step 4Go to Step 5
4Repair the exhaust system as needed.
Is the repair complete?–Go to Step 6–
5Replace the Three Way Catalytic Converter (TWC).
Is the repair complete?–Go to Step 6–
6
1. Using the scan tool, clear the Diagnostic Trouble
Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the Conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?
–
Go to Step 7Go to Step 2
7
Check if any additional DTCs are set.
Are any DTCs displayed that have not been
diagnosed?
–
Go to
Applicable DTC
table
System OK

1F–210 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F240
DIAGNOSTIC TROUBLE CODE (DTC) – P0444 EVAP PURGE CONTROL
CIRCUIT NO SIGNAL
Circuit Description
The evaporative emission (EVAP) system includes the
following components :

Fuel tank.

EVAP vent solenoid.

Fuel pipes and hoses.

Fuel vapor lines.

Fuel cap.

EVAP canister.

Purge lines.

EVAP canister purge valve.

EVAP service port.
The evaporative emission system is checked by apply-
ing vacuum to the EVAP system and monitoring for a
vacuum decay. The engine control module(ECM) moni-
tors the vacuum level through the fuel tank pressure
sensor signal. At the appropriate time, the EVAP canis-
ter purge valve and the EVAP vent solenoid are turned
on, allowing the engine to draw a small vacuum on the
entire EVAP system. After the desired vacuum level has
been achieved, the EVAP canister purge valve is turned
OFF, sealing the system. If a sufficient vacuum level
cannot be achieved, a large leak is indicated. This can
be caused by the following conditions :
Missing or faulty fuel cap.
Disconnected or faulty fuel tank pressure sensor.
Disconnected, damaged, pinched, or blocked EVAP
purge line.
Disconnected or faulty EVAP canister purge valve.
Disconnected or faulty EVAP vent solenoid.Open ignition feed circuit to the EVAP vent or purge so-
lenoid.
Damaged EVAP canister.
Leaking fuel sensor assembly O-ring.
Leaking fuel tank or fuel filler beck.
Any of the above conditions can set DTC P0444.
The test is failed if the tank vacuum is less than 10 in
H20 for 15 seconds and the manifold vacuum integral is
greater than 49512 (proportional to purge mass from the
tank).
Conditions for Setting the DTC

Intake Air Temperature(IAT) is between 4°C and
34°C(39°F and 93°F).at engine start up.

Engine Coolant Temperature(ECT) is between 4°C
and 34°C(39°F and 93°F).at engine start up.

Barometric pressure (BARO) is greater than 68kPA.

IAT is not more than 8°C(46°F) greater than the ECT
at start up.

Fuel level is between 10% and 90%.

The throttle position (TP) sensor is less than or equal
to 100%.

No fuel slosh, and the change in fuel level percent is
21 counts on 0.125 sec.

Manifold vacuum is greater than or equal to 10kPA.

Fuel level or change in tank pressure is less than or
equal to 24.9 in H2O.

System voltage is between 11V and 16V.

ENGINE CONTROLS 1F–211
DAEWOO M-150 BL2

The EVAP system in unable to achieve or maintain
vacuum during the diagnostic test. The amount of
decay will vary within the fuel level.
Action Taken When The DTCs Sets

The Malfunction Indicator Lamp (MIL) will illuminate.

The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Failure Records buffers.

A history DTC is stored.
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
Although this DTC is considered a type. A diagnostic, it
acts like a type B diagnostic under certain conditions.
Whenever this diagnostic reports the system has
passed, or if the battery is disconnected, the diagnostic
must fail twice before setting a DTC. The initial failure is
not reported to the diagnostic executive or displayed on
a scan tool. A passing system always reports to the
diagnostic executive immediately.Check for the following conditions :

Missing or damaged fuel cap.

Missing or damaged O-rings at fuel vapor and EVAP
purge line canister fittings.

Cracked or punctured EVAP canister.

Damaged source vacuum line, EVAP purge line,
EVAP vent hose or fuel tank vapor line.

Poor 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.

Damaged harness. Inspect the wiring harness to the
EVAP vent solenoid, EVAP canister purge valve, and
the fuel tank pressure sensor for an intermittent open
or short circuit.

Kinked, pinched or plugged vacuum source, EVAP
purge, or fuel tank vapor line. Verify that the lines are
not restricted.

1F–212 ENGINE CONTROLS
DAEWOO M-150 BL2
DTC P0444 – EVAP Purge Control Circuit No Signal
StepActionValue(s)YesNo
1
Perform an Euro On-Board Diagnostic (EOBD)
System Check.
Is the system check complete?
–
Go to Step 2
Go to
“On-Board
Diagnostic
System Check”
2
1. Disconnect the evaporative emission (EVAP)
canister purge valve connector.
2. Connect a test light between the EVAP canister
purge valve connector terminal 2 and battery
positive.
Is the test light ON?
–
Go to Step 3Go to Step 5
3
1. Disconnect the ECM connector.
2. Connect a test light between the ECM connector
terminal 66 and ground.
Is the test light ON?
–
Go to Step 4Go to Step 6
4
1. Repair the line break in the wire between the
EVAP canister purge valve connector 1 and the
ECM connector terminal 66.
2. Clear any Diagnostic Trouble Codes (DTCs) from
the ECM.
3. Perform the diagnostic system check.
Is the repair complete?
–
System OK
–
5
1. Repair the line break in the wire between the
EVAP canister purge valve connector 2 and the
main relay connector terminal 87.
2. Clear any Diagnostic Trouble Codes (DTCs) from
the ECM.
3. Perform the diagnostic system check.
Is the repair complete?
–
System OK
–
6
1. Replace the ECM.
2. Perform the diagnostic system check.
Is the repair complete?
–
Go to Step 7
–
7
1. Using the scan tool, clear the Diagnostic Trouble
Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the conditions for
setting the DTC as specifiec in the supporting
text.
Does the scan tool indicate that this diagnostic ran
and passed?
–
Go to Step 7Go to Step 2
8
Check if any additional DTCs are set.
Are any DTCs displayed that have not been
diagnosed?
–
Go to
Applicable DTC
table
System OK

ENGINE CONTROLS 1F–213
DAEWOO M-150 BL2
BLANK

1F–214 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F240
DIAGNOSTIC TROUBLE CODE (DTC) – P0445 EVAP PURGE CONTROL
CIRCUIT FAULT
Circuit Description
The evaporative emission (EVAP) system includes the
following components :

Fuel tank.

EVAP vent solenoid.

Fuel tank pressure sensor.

Fuel pipes and hoses.

Fuel vapor lines.

Fuel cap.

EVAP canister.

Purge lines.

EVAP canister purge valve.

EVAP service port.
The evaporative emission system is checked by apply-
ing vacuum to the EVAP system and monitoring for a
vacuum decay. The engine control module(ECM) moni-
tors the vacuum level through the fuel tank pressure
sensor signal. At the appropriate time, the EVAP canis-
ter purge valve and the EVAP vent solenoid are turned
on, allowing the engine to draw a small vacuum on the
entire EVAP system. After the desired vacuum level has
been achieved, the EVAP canister purge valve is turned
OFF, sealing the system. If a sufficient vacuum level
cannot be achieved, a large leak is indicated. This can
be caused by the following conditions :
Missing or faulty fuel cap.
Disconnected or faulty fuel tank pressure sensor.
Disconnected, damaged, pinched, or blocked EVAP
purge line.
Disconnected or faulty EVAP canister purge valve.Disconnected or faulty EVAP vent solenoid.
Open ignition feed circuit to the EVAP vent or purge so-
lenoid.
Damaged EVAP canister.
Leaking fuel sensor assembly O-ring.
Leaking fuel tank or fuel filler beck.
Any of the above conditions can set DTC P0445.
The test is failed if the tank vacuum is less than 10 in
H20 for 15 seconds and the manifold vacuum integral is
greater than 49512 (proportional to purge mass from the
tank).
Conditions for Setting the DTC

Intake Air Temperature(IAT) is between 4°C and
34°C(39°F and 93°F).at engine start up.

Engine Coolant Temperature(ECT) is between 4°C
and 34°C(39°F and 93°F).at engine start up.

Barometric pressure (BARO) is greater than 68kPA.

IAT is not more than 8°C(46°F) greater than the ECT
at start up.

Fuel level is between 10% and 90%.

The throttle position (TP) sensor is less than or equal
to 100%.

No fuel slosh, and the change in fuel level percent is
21 counts on 0.125 sec.

Manifold vacuum is greater than or equal to 10kPA.

Fuel level or change in tank pressure is less than or
equal to 24.9 in H2O.

System voltage is between 11V and 16V.