ignition DAEWOO LACETTI 2004 Service Repair Manual

7D – 10IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
NO COOL AIR FROM BLOWER
StepActionValue(s)YesNo
11. Turn the ignition to ON.
2. Observe the temperature indication screen of
the controller.
Does the digit flash on and off?–Go to Step 2Go to Step 3
2Run a self–diagnosis circuit check.
Does the display indicate a defect code?–Go to the table
for the code
that flashes.Go to Step 7
3Observe the blower motor operation.
Is the blower motor functioning at all?–Go to Step 4Go to ”Blower
Motor Does
Not Run at All”
4Use the blower push switch to cycle the blower
through its different speeds.
Does the motor function at different speeds?–Go to Step 5Go to”Code 6 –
Power Transis-
tor Error”
51. Run the blower and operate the MODE push
switch manually.
2. Check for airflow out the various outlets.
Does the air flow from the different outlets as it
should?–Go to Step 7Go to Step 6
61. Remove the heater outlet and check for ob-
structions.
2. Remove any obstructions found.
Is the heater operating?–System OKGo to Step 9
7Observe the air mix door motor (AMD) while chang-
ing the temperature setting from 18 to 32°C (64 to
90°F) and then from 32 to 18°C (90 to 64°F).
Is the AMD motor functioning properly?–Go to Step 8Go to”Code 3 –
Air Mix Door
Error”
8Perform the checks found in ”Insufficient Cooling
Diagnosis.”
Is the system operating normally now?–System OKGo to Step 9
9Place the controller in the AUTO mode.
Is smoke taken into the intake port of the in–car sen-
sor?–Go to Step 12Go to Step 10
10Check the intake hose for the in–car sensor.
Is the hose in good condition?–Go to Step 12Go to Step 11
11Repair or replace the intake hose.
Is the repair complete?–System OK–
12Check the in–car sensor using the tests in ”Code 1
– In–Car Sensor Error.”
Is there a problem indicated in the sensor, the sensor
wiring, or the controller?–Go to Step 13Go to Step 14
13Repair or replace the sensor, the wiring, or the con-
troller as required.
Is the repair complete?–System OK–
14Check the ambient air temperature sensor using the
tests in ”Code 2 – Ambient Air Temperature Sensor
Error.”
Is there a problem indicated in the sensor, the sensor
wiring, or the controller?–Go to Step 15Go to Step 16

7D – 12IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
BLOWER MOTOR DOES NOT RUN AT ALL
StepActionValue(s)YesNo
11. Turn the ignition to ON.
2. Observe the temperature indication screen of
the controller.
Does the digit go on and off?–Go to Step 2Go to Step 3
2Run a self–diagnosis circuit check.
Does the display indicate a defect code?–Go to the table
for the code
that flashes.–
3Check fuse F7 in the I/P fuse block.
Is this fuse in good condition?–Go to Step 5Go to Step 4
4Replace fuse F7.
Is the repair complete?–System OK–
5Check fuse EF3 in the engine fuse block.
Is this fuse in good condition?–Go to Step 7Go to Step 6
6Replace fuse EF3.
Is the repair complete?–System OK–
71. Turn the ignition switch to ON.
2. Measure the voltage between ground and ter-
minal 87(Violet) of the blower relay.
Is the voltage within the specified value?11–14 vGo to Step 15Go to Step 8
8Measure the voltage between ground and terminal
86 (Brown) at the blower relay.
Is the voltage within the specified value?11–14 vGo to Step 10Go to Step 9

AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 13
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
91. Turn the ignition switch to OFF.
2. Check circuit (Brown) between terminal 86 of
the blower relay to F7 in the I/P fuse block.
3. Repair any problem found in the wiring or ter-
minals at the relay socket or connector C203.
Is the repair complete?–System OK–
10Measure the voltage between ground and terminal
30 (Red) at the blower relay.
Is the voltage within the specified value?11–14 vGo to Step 12Go to Step 11
111. Turn the ignition switch to OFF.
2. Check circuit (Red) between terminal 30 of the
blower relay to EF3 in the engine fuse block.
3. Repair any problem found in the wiring or ter-
minals at the fuse block connector C105, con-
nector C202, or at the relay socket.
Is the repair complete?–System OK–
121. Turn the ignition switch to OFF.
2. Check the continuity in the wiring harness be-
tween the blower relay terminal 85 (Black) and
ground.
Does the ohmmeter show the specified value?
0 ΩGo to Step 14Go to Step 13
13Repair any problem found in terminal 85 at the relay
connector, circuit (Black), Connector C201, or
ground G201.
Is the repair complete?–System OK–
14Replace the blower relay.
Is the repair complete?–System OK–
151. Turn the ignition switch to OFF.
2. Disconnect the wiring harness at the blower
motor.
3. Turn the ignition switch to ON.
4. Measure voltage between ground and blower
connector 1 (Yellow).
Is the voltage within the specified value?11–14 vGo to Step 17Go to Step 16
161. Turn the ignition switch to OFF.
2. Check circuit (Yellow) between blower connec-
tor terminal 1 and blower relay terminal 87.
3. Repair any problem found in the wiring or a
connector terminal at the blower connector,
connector C208, or the blower relay socket.
Is the repair complete?–System OK–
17Measure the resistance between the connector ter-
minals on the blower motor.
Does the resistance match the specified value?
5 ΩGo to Step 19Go to Step 18
18Replace the blower motor.
Is the repair complete?–System OK–
19Measure the resistance of circuit (Violet) between
terminal 2 of the blower connector and terminal 30
of the Max HI relay and terminal 6 of the power tran-
sistor.
Does the resistance match the specified value?
0 ΩGo to Step 21Go to Step 20

AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 17
DAEWOO V–121 BL4
COMPRESSOR MAGNETIC CLUTCH DOES NOT ENGAGE
StepActionValue(s)YesNo
11. Remove the ATC Controller from the instru-
ment panel, keeping the wiring harness con-
nected.
2. Turn the ignition switch to ON.
3. Turn the A/C switch to ON.
4. Check the voltage between ground and termi-
nal A11 on the controller.
Is the voltage within the specified value?11–14 vGo to ”Insuffi-
cient Cooling
Diagnosis”Go to Step 2
2Replace the ATC controller.
Is the repair complete?–System OK–

7D – 18IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODES
CODE 1 – IN–CAR SENSOR ERROR
This code will set if the output of the in–car sensor indicates a probable short circuit or an open in the sensor or the associat-
ed wiring harness, or a malfunction of the ATC controller.
Code 1 – In–Car Sensor Error
StepActionValue(s)YesNo
11. Disconnect the in–car sensor connector from
the ATC controller.
2. Examine the wiring from the sensor to the con-
nector and the connector for any signs of dam-
age.
3. Measure the resistance between the in–car
sensor connector terminals.
Is there any sign of damage in the wiring or connec-
tor, or is the resistance outside the specified value
at 20 to 25°C (68 to 77°F)?2600–2100 ΩGo to Step 2Go to Step 3
2Repair the damaged wiring or the connector, or re-
place the in–car sensor as required.
Is the repair complete?–System OK–
31. Turn the ignition to ON.
2. Measure the voltage between the two connec-
tor terminals on the controller housing.
Is the voltage equal to the value specified?> 4 vGo to Step 7Go to Step 4
4Check the terminals on the in–car sensor connector.
Is any problem found with the connector?–Go to Step 5Go to Step 6
5Repair the connector terminals or replace the in–car
sensor or ATC controller as required.
Is the repair complete?–System OK–

AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 19
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
61. Reconnect the in–car sensor to the controller.
2. Turn the ignition switch to ON.
3. Observe the temperature display area.
Does this display indicate the continuing presence of
a code 1 condition?–Go to Step 7System OK
7Replace the ATC controller.
Is the repair complete?–System OK–

7D – 20IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
CODE 2 – AMBIENT AIR TEMPERATURE SENSOR
ERROR
This code will set if the output of the ambient air temperature sensor indicates a probable short circuit or an open in the
sensor or the associated wiring harness, or a malfunction of the ATC controller.
Code 2 – Ambient Air Temperature Sensor Error
StepActionValue(s)YesNo
11. Disconnect the ambient air sensor connector
from the front bumper harness.
2. Measure the resistance between the ambient
air sensor connector terminals.
Is the resistance equal to the specified value at 20
to 25°C (68 to 77°F)?2600–2100 ΩGo to Step 5Go to Step 2
21. Remove the ambient air sensor from behind
the front bumper.
2. Examine the wiring for any open or short and
examine the connector for any damage.
Is there a problem with the wiring or the connector?–Go to Step 3Go to Step 4
3Repair the problem found in the ambient air sensor
wiring or the connector.
Is the repair complete?–System OK–
4Replace the ambient air sensor.
Is the repair complete?–System OK–
51. Turn the ignition to ON.
2. Measure the voltage between the two terminals
in the ambient air sensor connector on the front
bumper harness.
Is the voltage equal to the value specified?> 4 vGo to Step 7Go to Step 6
61. Reconnect the in–car sensor to the controller.
2. Turn the ignition switch to ON.
3. Observe the temperature display area.
Does this display indicate the continuing presence of
a code 2 condition?–Go to Step 8System OK

7D – 22IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
CODE 3 – WATER SENSOR ERROR
This code will set if the output of the coolant sensor indicates a probable short circuit or an open in the sensor or the associ-
ated wiring harness, or a malfunction of the ATC controller.
Code 3 – Water Sensor Error
StepActionValue(s)YesNo
11. Disconnect the coolant temperature sensor
connector from the ATC harness.
2. Examine the wiring from the sensor to the con-
nector and examine the connector for any
signs of damage.
3. Measure the resistance between the coolant
temperature sensor connector terminals.
Is there any sign of damage in the wiring or the con-
nector, or is the resistance outside the specified val-
ue at 20 to 25°C (68 to 77°F)?2600–2100 ΩGo to Step 2Go to Step 3
2Repair the damaged wiring or the connector, or re-
place the coolant temperature sensor as required.
Is the repair complete?–System OK–
31. Turn the ignition to ON.
2. Measure the voltage between the two coolant
temperature sensor connector terminals on the
ATC harness.
Is the voltage equal to the specified value?< 4 vGo to Step 7Go to Step 4
4Check the terminals on the coolant temperature
sensor connector.
Is any problem found with the connector?–Go to Step 5Go to Step 6
5Repair the connector terminals or replace the cool-
ant temperature sensor or ATC controller as re-
quired.
Is the repair complete?–System OK–

AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 23
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
61. Reconnect the coolant temperature sensor to
the ATC harness.
2. Turn the ignition switch to ON.
3. Observe the temperature display area.
Does this display indicate the continuing presence of
a code 3 condition?–Go to Step 9System OK
71. Pull the ATC controller from the instrument
panel, leaving the wiring harness connected.
2. Measure the voltage between terminals A13
and B9 by backprobing the connectors.
Is the voltage equal to the value specified?< 4 vGo to Step 9Go to Step 8
81. Trace the wiring from controller terminals A13
and B9 to the coolant temperature sensor con-
nector terminals on the ATC harness connec-
tors.
2. Repair any open or high resistance found in the
wiring or connector terminals.
Is the repair complete?–System OK–
9Replace the ATC controller.
Is the repair complete?–System OK–

AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D – 25
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
71. Remove the ATC controller from the instrument
panel.
2. Disconnect the harness connectors from the
ATC controller.
3. Examine the connector terminals on the har-
ness connectors and the controller connectors
and the harness wiring.
Is there a problem with any of these connectors or
the wiring?–Go to Step 8Go to Step 9
8Repair the problem found with a connector terminal
or wiring.
Is the repair complete?–System OK–
9Check continuity in the harness between the control-
ler connectors and the AMD motor connector.
S Controller terminal A2 to motor terminal 7.
S Controller terminal A8 to motor terminal 5.
S Controller terminal B6 to motor terminal 2.
S Controller terminal B5 to motor terminal 6.
S Controller terminal B4 to motor terminal 3.
Does the continuity equal the specified value?
0 ΩGo to Step 10Go to Step 11
10Repair the continuity problem.
Is the repair complete?–System OK–
111. Reconnect the AMD motor to the ATC harness.
2. Reconnect the ATC harness connectors to the
controller.
3. Turn the ignition to ON.
4. Use backprobing for voltage measurements.
5. Measure the voltage between ground and ter-
minal B5 at the controller.
Is the voltage equal to the specified value?< 4 vGo to Step 12Go to Step 14
121. Set the temperature controller to 18°C (64°F).
2. Connect a voltmeter between ground and ter-
minal A8 at the controller. It should display
about 12 v.
3. Raise the temperature setting on the controller
to 32°C (90°F).
Does the voltage equal the specified value?Drops from
12 v to 0 vGo to Step 13Go to Step 15
131. Connect a voltmeter between ground and ter-
minal A2 at the controller. It should display
about 12 v.
2. Change the temperature setting to 18°C
(64°F).
Does the voltage equal the specified value?Drops from
12 v to 0 vGo to Step 20Go to Step 15
141. Recheck the wiring harness and the connector
terminals associated with controller terminals
B4, B5, and B6, and AMD motor terminals 2, 6,
and 3.
2. Repair any problem found.
Is the repair complete?–System OK–
15Recheck all wiring circuits between the controller
and the AMD motor.
Is there a problem in the wiring or the connectors?–Go to Step 16Go to Step 17