2003 DAEWOO MATIZ fuel pressure

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–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.

ENGINE CONTROLS 1F–215
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 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.

Coolant fan turns ON.
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 ona 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 con-
nectors 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.
DTC P0445 – EVAP Purge Control Circuit Fault
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. Measure the resistance of the EVAP canister
purge valve connector.
Does the resistance measure near within the value
specified?
30ΩGo to Step 3Go to Step 9
3
Connect a test light between EVAP canister purge
valve connector terminal 2 and ground.
Is the test light ON?
–
Go to Step 4Go to Step 6
4
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 5Go to Step 7

1F–218 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F250
DIAGNOSTIC TROUBLE CODE (DTC) – P0462 FUEL LEVEL SENSOR LOW
V O LTA G E
Circuit Description
The engine control module(ECM) uses the fuel level in-
put from the Fuel Level Sensor to calculate expected va-
por pressures within the fuel system. Vapor pressure
vary as the fuel level changes. Vapor pressure is critical
in determining if the evaporative emission (EVAP) sys-
tem is operating properly. Fuel Level is also used to de-
termine if the Fuel level is too high or too low to be able
to accurately detect EVAP system faults. This Diagnos-
tic Trouble Code(DTC) detects a stuck fuel level sender.
Conditions for Setting the DTC

Fuel Level Sensor voltage is less than 0.05V.

Fuel Level Sensor circuit low voltage.
Action Taken When The DTCs Sets

The Malfunction Indicator Lamp (MIL) will not illumi-
nate.

The ECM will store conditions which were present
when the DTC was set as Failure Records data only.

This information will not be stored in the Freeze
Frame data.Conditions for Clearing the MIL/DTC

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
Inspect harness connectors for backed-out terminal, im-
proper mating, broken locks, improperly formed or dam-
aged terminals, and poor terminal-to-wire connection.
Inspect the wiring harness for damage.
A stuck Fuel Level Sensor may cause the DTC to set. If
DTC P0463 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful in deter-
mining vehicle operating conditions when the DTC was
first set.
Resistance check for the Fuel Level Sensor.
Empty = 100 ohms or over.
Half full = about 32.5 ohms.
Full = 10 ohms or less.

1F–222 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F250
DIAGNOSTIC TROUBLE CODE (DTC) – P0463 FUEL LEVEL SENSOR HIGH
V O LTA G E
Circuit Description
The engine control module(ECM) uses the fuel level in-
put from the Fuel Level Sensor to calculate expected va-
por pressures within the fuel system. Vapor pressure
vary as the fuel level changes. Vapor pressure is critical
in determining if the evaporative emission (EVAP) sys-
tem is operating properly. Fuel Level is also used to de-
termine if the Fuel level is too high or too low to be able
to accurately detect EVAP system faults. This Diagnos-
tic Trouble Code(DTC) detects a stuck fuel level sender.
Conditions for Setting the DTC

Fuel Level Sensor voltage is higher than 4.9V.

Fuel Level Sensor circuit high voltage.
Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will not illumi-
nate.

The ECM will store conditions which were present
when the DTC was set as Failure Records data only.

This information will not be stored in the Freeze
Frame data.Conditions for Clearing the MIL/DTC

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
Inspect harness connectors for backed-out terminal, im-
proper mating, broken locks, improperly formed or dam-
aged terminals, and poor terminal-to-wire connection.
Inspect the wiring harness for damage.
A stuck Fuel Level Sensor may cause the DTC to set. If
DTC P0463 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful in deter-
mining vehicle operating conditions when the DTC was
first set.
Resistance check for the Fuel Level Sensor.
Empty = 100 ohms or over.
Half full = about 32.5 ohms.
Full = 10 ohms or less.

1F–246 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F070
DIAGNOSTIC TROUBLE CODE (DTC) 0505
IDLE AIR CONTROL VALVE (IACV) CIRCUIT FAULT
Circuit Description
The Engine Control Module (ECM) controls the air en-
tering into the engine with an Idle Air Control (IAC)
Valve. To increase the idle rpm, the ECM commands the
pintle inside the IAC valve away from the throttle body
seat. This allows more air to bypass through the throttle
blade. To decrease the rpm the ECM commands the
pintle towards the throttle body seat. This reduces the
amount of air bypassing the throttle blade. A scan tool
will read the IAC valve pintle position in counts. The
higher the counts, the more air that is allowed to bypass
the throttle blade. This Diagnostic Trouble Code (DTC)
determines if a low idle condition exists as defined as
100 rpm below the desired idle rpm.
Conditions for Setting the DTC

No intrusive tests are active.

DTC(s) P0106, P0107, P0108, P0112, P0113,
P0117, P0118, P0122, P0123, P0131, P0132,
P0133, P1133, P1134, P0171, P1171, P0172, P0201,
P0202, P0203, P0204, P0300, P0336, P0337,
P0341, P0342, P0351, P0352, P0402, P0404,
P1404, P0405, P0406, P0443, and P0502 are not
set.

Engine is running more than 60 seconds.

Barometric Pressure (BARO) is greater than 72 kPa
(10.4 psi).

Engine Coolant Temperature (ECT) is greater than
60C (140F).

Ignition voltage is between 11 and 16 volts.

The Intake Air Temperature (IAT) is greater than
–20C (–4F).

Manifold Absolute Pressure is less than 60 kPa (8.7
psi).
IAC valve is controlled fully opened.

All of the above must be met for greater than 5 sec-
onds.
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.

Disconnecting the ECM battery feed for more than 10
seconds.
Diagnostic Aids
Inspect the IAC valve electrical connection for proper
mating.
Inspect the wiring harness for damage.
Inspect the throttle stop screw for signs of tampering.
Inspect the throttle linkage for signs of binding or exces-
sive wear.
A slow or unstable idle may be caused by one of the fol-
lowing conditions:

Fuel system too rich or too lean.

Foreign material in the throttle body bore or in the air
induction system.

A leaking or restricted intake manifold.

1F–274 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F340
DIAGNOSTIC TROUBLE CODE (DTC) – P0656 FUEL LEVEL GAUGE CIRCUIT
FAULT
Circuit Description
The engine control module(ECM) uses the fuel level in-
put from the Fuel Level Sensor to calculate expected va-
por pressures within the fuel system. Vapor pressure
vary as the fuel level changes. Vapor pressure is critical
in determining if the evaporative emission (EVAP) sys-
tem is operating properly. Fuel Level is also used to de-
termine if the Fuel level is too high or too low to be able
to accurately detect EVAP system faults. This Diagnos-
tic Trouble Code(DTC) detects a stuck fuel level sender.
Conditions for Setting the DTC

Fuel Level Sensor voltage is higher than 4.8V.

Fuel Level Sensor circuit high voltage.
Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will not illumi-
nate.

The ECM will store conditions which were present
when the DTC was set as Failure Records data only.

This information will not be stored in the Freeze
Frame data.Conditions for Clearing the MIL/DTC

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
Inspect harness connectors for backed-out terminal, im-
proper mating, broken locks, improperly formed or dam-
aged terminals, and poor terminal-to-wire connection.
Inspect the wiring harness for damage.
A stuck Fuel Level Sensor may cause the DTC to set. If
DTC P0656 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful in deter-
mining vehicle operating conditions when the DTC was
first set.
Resistance check for the Fuel Level Sensor.

Empty = 100 ohms or over.

Half full = about 32.5 ohms.

Full = 10 ohms or less.