change time DAEWOO MATIZ 2003 Service Owner's Manual

1F–226 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F090
DIAGNOSTIC TROUBLE CODE (DTC) – P0480 LOW SPEED COOLING FAN
RELAY CIRCUIT FAULT (WITHOUT A/C)
Circuit Description
Ignition voltage is supplied directly to the cooling fan
relay coil. The engine control module(ECM) controls the
relay by grounding the control circuit via an internal
switch called a driver. The primary function of the driver
is supply the ground for the component being controlled.
Each driver has a fault line which is monitored by the
ECM. When the ECM is commanding a component ON,
the voltage of the control circuit should be low (near
0volts). When the ECM is commanding the control cir-
cuit to a component OFF, the voltage potential of the cir-
cuit should be high(near battery voltage). If the fault
detection circuit senses a voltage other than what is ex-
pected, the fault line status will change causing the DTC
to set.
The relay is used to control the high current flow to the
cooling fan motors. This allows the ECM driver to only
have to handle the relatively low current used by the
relay.
Conditions for Setting the DTC

Diagnostic Trouble Codes (DTCs) P0117, P0118 not
set.

Ignition ON.
Ignition voltage is greater than 10 volts.

Engine run time is greater than 5 seconds.
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
Using Freeze Frame and/or failure records data may aid
in locating an intermittent condition. If the DTC cannot
be duplicated, the information included in the Freeze
Frame and/or failure records data can be useful in deter-
mining how many miles since the DTC set. The fail
counter and Pass Counter can also be used to deter-
mine how many ignition cycles the diagnostics reported

1F–230 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F270
DIAGNOSTIC TROUBLE CODE (DTC) – P0480 LOW SPEED COOLING FAN
RELAY CIRCUIT FAULT (WITH A/C)
Circuit Description
Ignition voltage is supplied directly to the cooling fan
relay coil. The engine control module(ECM) controls the
relay by grounding the control circuit via an internal
switch called a driver. The primary function of the driver
is supply the ground for the component being controlled.
Each driver has a fault line which is monitored by the
ECM. When the ECM is commanding a component ON,
the voltage of the control circuit should be low (near
0volts). When the ECM is commanding the control cir-
cuit to a component OFF, the voltage potential of the cir-
cuit should be high(near battery voltage). If the fault
detection circuit senses a voltage other than what is ex-
pected, the fault line status will change causing the DTC
to set.
The relay is used to control the high current flow to the
cooling fan motors. This allows the ECM driver to only
have to handle the relatively low current used by the
relay.
Conditions for Setting the DTC

Diagnostic Trouble Codes (DTCs) P0117, P0118 not
set.

Ignition ON.
Ignition voltage is greater than 10 volts.

Engine run time is greater than 5 seconds.
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
Using Freeze Frame and/or failure records data may aid
in locating an intermittent condition. If the DTC cannot
be duplicated, the information included in the Freeze
Frame and/or failure records data can be useful in deter-
mining how many miles since the DTC set. The fail
counter and Pass Counter can also be used to deter-
mine how many ignition cycles the diagnostics reported

1F–234 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F090
DIAGNOSTIC TROUBLE CODE (DTC) – P0481 HIGH SPEED COOLING FAN
RELAY CIRCUIT FAULT (WITHOUT A/C)
Circuit Description
Ignition voltage is supplied directly to the cooling fan
relay coil. The engine control module(ECM) controls the
relay by grounding the control circuit via an internal
switch called a driver. The primary function of the driver
is supply the ground for the component being controlled.
Each driver has a fault line which is monitored by the
ECM. When the ECM is commanding a component ON,
the voltage of the control circuit should be low (near
0volts). When the ECM is commanding the control cir-
cuit to a component OFF, the voltage potential of the cir-
cuit should be high(near battery voltage). If the fault
detection circuit senses a voltage other than what is ex-
pected, the fault line status will change causing the DTC
to set.
The relay is used to control the high current flow to the
cooling fan motors. This allows the ECM driver to only
have to handle the relatively low current used by the
relay.
Conditions for Setting the DTC

Diagnostic Trouble Codes (DTCs) P0117, P0118 not
set.

Ignition ON.
Ignition voltage is greater than 10 volts.

Engine run time is greater than 5 seconds.
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
Using Freeze Frame and/or failure records data may aid
in locating an intermittent condition. If the DTC cannot
be duplicated, the information included in the Freeze
Frame and/or failure records data can be useful in deter-
mining how many miles since the DTC set. The fail
counter and Pass Counter can also be used to deter-
mine how many ignition cycles the diagnostics reported

1F–238 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F270
DIAGNOSTIC TROUBLE CODE (DTC) – P0481 HIGH SPEED COOLING FAN
RELAY CIRCUIT FAULT (WITH A/C)
Circuit Description
Ignition voltage is supplied directly to the cooling fan
relay coil. The engine control module(ECM) controls the
relay by grounding the control circuit via an internal
switch called a driver. The primary function of the driver
is supply the ground for the component being controlled.
Each driver has a fault line which is monitored by the
ECM. When the ECM is commanding a component ON,
the voltage of the control circuit should be low (near
0volts). When the ECM is commanding the control cir-
cuit to a component OFF, the voltage potential of the cir-
cuit should be high(near battery voltage). If the fault
detection circuit senses a voltage other than what is ex-
pected, the fault line status will change causing the DTC
to set.
The relay is used to control the high current flow to the
cooling fan motors. This allows the ECM driver to only
have to handle the relatively low current used by the
relay.
Conditions for Setting the DTC

Diagnostic Trouble Codes (DTCs) P0117, P0118 not
set.

Ignition ON.
Ignition voltage is greater than 10 volts.

Engine run time is greater than 5 seconds.
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
Using Freeze Frame and/or failure records data may aid
in locating an intermittent condition. If the DTC cannot
be duplicated, the information included in the Freeze
Frame and/or failure records data can be useful in deter-
mining how many miles since the DTC set. The fail
counter and Pass Counter can also be used to deter-
mine how many ignition cycles the diagnostics reported

1F–242 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F280
DIAGNOSTIC TROUBLE CODE (DTC) – P0501 VEHICLE SPEED NO SIGNAL
(M/T ONLY)
Circuit Description
Vehicle speed information is provided to the engine con-
trol module (ECM) by the voltage speed sensor (VSS) is
a permanent magnet generator that is mounted in the
transaxle and produces a pulsing voltage whenever ve-
hicle speed is over 3 mph (5km/h). The A/C voltage level
and the number of pulses increase with vehicle speed.
The ECM converts the pulsing voltage into mph (km/h)
and than supplies the necessary signal to the instrument
panel for speedometer / odometer operation and to the
cruise control module and multi-function alarm module
operation. The Diagnostic Trouble Code (DTC) will de-
tect if vehicle speed is reasonable according to engine
rpm and load.
Conditions for Setting the DTC

Vehicle speed is not change at least 10 seconds.

Engine speed is greater than 2,100rpm.

MAF is greater than 152mg/tdc.
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.

Using the scan tool can clear DTC(s).
Diagnostic Aids
An Intermittent problem may be caused by a poor con-
nection, rubbed through wire insulation, or wire that is
broken inside the insulation.
VSS signal circuit should be thoroughly checked for the
following conditions

Backed-out terminals

Improper mating

Broken locks

Improperly formed

Damaged terminals

Poor terminals to wire connection

Physical damage to the wiring harness
Ensure the VSS is correctly torqued to the trnasaxle
housing.
Refer to “intermittents” in this Section.

1F–250 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F300
DIAGNOSTIC TROUBLE CODE (DTC) – P1535 EVAPORATOR TEMPERATURE
SENSOR HIGH VOLTAGE
Circuit Description
A semiconductor which resistance is noticeably
changed as the change of temperature. When the refrig-
erant temperature of the evaporator drops to 0°C (0°F)
and below, the evaporator cores get stuck with frost or
ice, reducing the airflow, lowering the cooling capacity.
The thermistor is a sensor which is used to prevent from
frosting or icing. The thermistor is installed on the evap-
orator.
Conditions for Setting the DTC

A short to battery voltage condition exists and is pres-
ent for more the 2 seconds.
Action Taken When the DTC Sets

The ECM will not illuminate the Malfunction Indicator
Lamp (MIL).
A history DTCs is stored.

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

The A/C compressor operation will be disabled while
the low voltage indication exists.

Update the fail record each time the diagnostic test
fail.
Conditions for Clearing the MIL/DTC

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

Usisng the scan tool can clear DTC(s).

Disconnecting the ECM battery feed for 10 seconds.

1F–252 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F300
DIAGNOSTIC TROUBLE CODE (DTC) – P1536 EVAPORATOR TEMPERATURE
SENSOR LOW VOLTAGE
Circuit Description
A semiconductor which resistance is noticeably
changed as the change of temperature. When the refrig-
erant temperature of the evaporator drops to 0°C (0°F)
and below, the evaporator cores get stuck with frost or
ice, reducing the airflow, lowering the cooling capacity.
The thermistor is a sensor which is used to prevent from
frosting or icing. The thermistor is installed on the evap-
orator.
Conditions for Setting the DTC

A short to battery voltage condition exists and is pres-
ent for more the 2 seconds.
Action Taken When the DTC Sets

The ECM will not illuminate the Malfunction Indicator
Lamp (MIL).
A history DTCs is stored.

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

The A/C compressor operation will be disabled while
the low voltage indication exists.

Update the fail record each time the diagnostic test
fail.
Conditions for Clearing the MIL/DTC

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

Usisng the scan tool can clear DTC(s).

Disconnecting the ECM battery feed for 10 seconds.

1F–266 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F050
DIAGNOSTIC TROUBLE CODE (DTC) – P1610 MAIN RELAY HIGH VOLTAGE
Circuit Description
When the ignition switch to ON, main relay will grounded
to ECM internal ground by ECM controlling.
A system voltage Diagnostic Trouble Code (DTC) will
set whenever the voltage is below a calibrated value.
Conditions for Setting the DTC

This DTC can be stored in “key-on” status.

Main relay wiring harness high voltage.
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.

Using the scan tool can clear DTC(s).
Diagnostic Aids
Inspect harness connectors for backed-out terminals,
improper mating, broken locks, improperly formed or
damaged terminals, and poor terminal-to-wire connec-
tion at the ECM.
Inspect the wiring harness for damage. If the harness
appears to be OK, observe the A/C pressure display on
the scan tool while moving the connectors and wiring
harnesses related to the ACP sensor. A change in the
A/C pressure display will indicate the location of the
fault.
If DTC P1610 cannot be duplicated, reviewing the Fail
Records vehicle mileage since the diagnostic test last
failed may help determine how often the condition that
caused the DTC to set occurs. This may assist in diag-
nosing the condition.

1F–268 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F050
DIAGNOSTIC TROUBLE CODE (DTC) – P1611 MAIN RELAY LOW VOLTAGE
Circuit Description
When the ignition switch to ON, main relay will grounded
to ECM internal ground by ECM controlling.
A system voltage Diagnostic Trouble Code (DTC) will
set whenever the voltage is below a calibrated value.
Conditions for Setting the DTC

This DTC can be stored in “key-on” status.

Main relay wiring harness high voltage.
Action Taken When The DTCs Sets

The ECM will illuminate the Malfunction Indicator
Lamp (MIL).

A history DTC is stored.

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

Using the scan tool can clear DTC(s).
Diagnostic Aids
Inspect harness connectors for backed-out terminals,
improper mating, broken locks, improperly formed or
damaged terminals, and poor terminal-to-wire connec-
tion at the ECM.
Inspect the wiring harness for damage. If the harness
appears to be OK, observe the A/C pressure display on
the scan tool while moving the connectors and wiring
harnesses related to the ACP sensor. A change in the
A/C pressure display will indicate the location of the
fault.
If DTC P1611 cannot be duplicated, reviewing the Fail
Records vehicle mileage since the diagnostic test last
failed may help determine how often the condition that
caused the DTC to set occurs. This may assist in diag-
nosing the condition.

7B–14 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO M-150 BL2
MAINTAINING CHEMICAL STABILITY
IN THE REFRIGERATION SYSTEM
The efficient operation and life of the air conditioning
system is dependent upon the chemical stability of the
refrigeration system. When foreign materials, such as
dirt, air, or moisture, contaminate the refrigeration sys-
tem, they will change the stability of the refrigerant and
the PAG compressor oil. They will also affect the pres-
sure-temperature relationship, reduce efficient opera-
tion, and can possibly cause interior corrosion and
abnormal wear of moving parts.
Observe the following practices to ensure chemical sta-
bility in the system:
Wipe away dirt or oil at and near any connection be-
fore opening that connection. This will reduce the
chance of dirt entering the system.
Cap, plug, or tape both sides of a connection as soon
as possible after opening the connection. This will
prevent the entry of dirt, foreign material, and mois-
ture.
Keep all tools clean and dry, including the manifold
gauge set and all replacement parts.
Use a clean and dry transfer device and container to
add PAG refrigerant oil. This will ensure that the oil
remains as moisture-free as possible. Refer to “Dis-
charging, Adding Oil, Evacuating and Charging Pro-
cedures for A/C System” in this section.
Have everything you need ready to allow you to per-
form all operations quickly when opening an A/C sys-
tem. Do not leave the A/C system open any longer
than necessary.
Evacuate and recharge any A/C system that has
been opened. Refer to “Discharging, Adding Oil, Eva-
cuating and Charging Procedures for A/C System” in
this section for the instructions to perform this proce-
dure properly.
All service parts are dehydrated and sealed before ship-
ping. They should remain sealed until just before making
connections. All the parts should be at room tempera-
ture before uncapping. This prevents condensation of
moisture from the air from entering the system. Reseal
all parts as soon as possible if the caps have been re-
moved but the connections cannot be made promptly.
DISCHARGING, ADDING OIL,
EVACUATING, AND CHARGING
PROCEDURES FOR A/C SYSTEMS
Caution: Use only refillable refrigerant tanks that
are authorized for the charging station being used.
The use of other tanks may cause personal injury or
void the warranty. Refer to the manufacturer’s in-
structions for the charging station.Caution: To avoid personal injury, always wear
goggles and gloves when performing work that in-
volves opening the refrigeration system.
A charging station discharges, evacuates, and re-
charges an air conditioning system with one hook-up.
Filtering during the recovery cycle together with filtering
during the evacuation cycle ensures a supply of clean,
dry refrigerant for A/C system charging.
Notice:
Never use the R-134a charging station on a system
charged with R-12. The refrigerants and the oils are
not compatible and must never be mixed in even the
smallest amount. Mixing refrigerant residue will dam-
age the equipment.
Never use adapters which convert from one size fit-
ting to another. This will allow contamination which
may cause system failure.
Charging Station Setup and Maintenance
Refer to the manufacturer’s instructions for all initial set-
up procedures and all maintenance procedures. There
are many charging stations available. All perform the
various tasks required to discharge the system and re-
cover refrigerant, evacuate the system, add a measured
amount of oil, and recharge an air conditioning system
with a measured amount of refrigerant.
Control Panel Functions
A charging station will have controls and indicators to al-
low the operator to control and monitor the operation in
progress. Refer to the manufacturer’s instructions for
details. These can be expected to include:
1. Main Power Switch: The main power switch supplies
electrical power to the control panel.
2. Display: The display shows the time programmed for
vacuum and the weight of the refrigerant pro-
grammed for recharging. Refer to the manufacturer’s
instructions for detailed programming information.
3. Low Side Manifold Gauge: This gauge shows the
system’s low side pressure.
4. High Side Manifold Gauge: This gauge shows the
system’s high side pressure.
5. Controls: This will contain the controls that control
various operating functions.
6. Low Side Valve: This valve connects the low side of
the A/C system to the unit.
7. Moisture Indicator: This indicator shows if the refrig-
erant is wet or dry.
8. High Side Valve: This valve connects the high side of
the A/C system to the unit.