battery DAEWOO LACETTI 2004 Service Owners Manual

1F – 98IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
411. Connect the cooling fan control relay.
2. Connect a fused jumper between the ECM
connector terminal 9 and ground.
3. Disconnect the cooling fan relay Hi.
4. Connect a fused jumper between the cooling
fan relay Hi connector terminals 30 and 87.
5. Disconnect the low speed cooling fan relay.
6. Connect a fused jumper between the low
speed cooling fan relay connector terminals 30
and 87.
7. Turn the ignition ON.
Do the cooling fans run at high speed?–Go to Step 43Go to Step 42
421. Turn the ignition OFF.
2. Connect a fused jumper between the ECM
connector terminal 9 and ground.
3. Disconnect the cooling fan control relay.
4. Connect a fused jumper between the cooling
fan control relay connector terminals 30 and
87.
5. Connect a fused jumper between the low
speed cooling fan relay connector terminals 30
and 87.
6. Turn the ignition ON.
Do the cooling fans run at high speed?–Go to Step 27–
43Replace the cooling fan relay Hi.
Is the repair complete?–System OK–
44Repair the open wire between the cooling fan relay
Hi connector terminal 86 and the ignition switch.
Is the repair complete?–System OK–
45Repair the open wire between the cooling fan relay
Hi connector terminal 30 and the battery.
Is the repair complete?–System OK–
46Repair the open wire between the cooling fan control
relay connector terminal 85 and the ignition switch
Is the repair complete?–System OK–
47Repair the open wire between the cooling fan control
relay connector terminal 87 and ground.
Is the repair complete?–System OK–
48Repair the open wire between the cooling fan relay
Hi connector terminal 87 and the auxiliary cooling
fan connector terminal 2.
Is the repair complete?–System OK–
49Repair the open wire between the cooling fan control
relay connector terminal 85 and the ECM connector
terminal 9.
Is the repair complete?–System OK–

1F – 100IENGINE CONTROLS
DAEWOO V–121 BL4
ENGINE COOLING FAN CIRCUIT CHECK – DUAL FAN
(1.8L DOHC)
Circuit Description
The engine cooling fan circuit operates the main cooling
fan and the auxiliary cooling fan. The cooling fans are con-
trolled by the engine control module (ECM) based on in-
puts from the Engine Coolant Temperature (ECT) sensor
and the Air Conditioning Pressure (ACP) sensor. The
ECM controls the low speed cooling fan operation by inter-
nally grounding the ECM connector terminal K28. This en-
ergizes the low speed cooling fan relay and operates the
main cooling fan and the auxiliary cooling fan at low speed
as the cooling fans are connected in a series circuit. The
ECM controls the high speed cooling fan operation by in-
ternally grounding the ECM connector terminal K28 and
the ECM connector terminal K12 at the same time. This
energizes the low speed cooling fan relay, the high speed
cooling fan relay, and the series/parallel cooling fan relay
resulting in high speed fan operation as the cooling fans
are now connected in a parallel circuit.
Diagnostic Aids
S If the owner complained of an overheating problem,
it must be determined if the complaint was due to
an actual boil over, or the engine coolant tempera-
ture gauge indicated overheating. If the engine is
overheating and the cooling fans are on, the cooling
system should be checked.
S If the engine fuse block fuses Ef21, Ef6, Ef8 be-
come open (blown) immediately after installation,
inspect for a short to ground in the wiring of the ap-
propriate circuit. If the fuses become open (blown)
when the cooling fans are to be turned on by the
ECM, suspect a faulty cooling fan motor.
S The ECM will turn the cooling fans on at low speed
when the coolant temperature is 97°C (207°F). The
ECM will turn the cooling fans off when the coolant
temperature is 94°C(201°F).
S The ECM will turn the cooling fans on at high speed
when the coolant temperature is 101°C (214°F).
The ECM will change the cooling fans from high
speed to low speed when the coolant temperature
is 98°C (208°F).S The ECM will turn the cooling fans on at low speed
when the A/C system is on. The ECM will change
the cooling fans from low speed to high speed
when the high side A/C pressure is 1882 kPa (273
psi) then return to low speed when the high side
A/C pressure is 1448 kPa (210 psi). When the A/C
system is on, the ECM will change the cooling fans
from low to high speed when the coolant tempera-
ture reaches 117°C (244°F) then return to low
speed when the coolant temperature reaches
11 4°C (237°F).
S The cooling fan circuit can be checked quickly by
disconnecting the ECM connector 2 and grounding
the connector terminal K28. This should create low
speed cooling fan operation with the ignition ON. By
grounding the ECM connector terminals K28 and
K12 and turning the ignition ON, high speed cooling
fan operation should be achieved.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
4. This step, along with step 5, checks for the ability of
the ECM to operate the cooling fans.
8. This step, along with step 9, checks for the ability of
the ECM to operate the cooling fans in response to
A/C pressure readings.
16. After confirming battery voltage and the ECM sup-
plying a ground to the coil side of the cooling fan
relay A, by jumpering connector terminals 30 and
87 it will be determined if the relay is at fault or a
wiring problem is present.
31. This step checks for the presence of battery volt-
age to the main cooling fan when the A/C is on. If
battery voltage is present and the cooling fans are
not operating, the problem is in the ground side of
the cooling fan circuit.
37. By directly grounding the ECM connector terminals
K28 and K12, the main and auxiliary cooling fans
should run at high speed.
Engine Cooling Fan Circuit Check – Dual Fan (1.8L DOHC)
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) system
check.
Is the check completed?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
21. Check the I/P fuse block fuse F2.
2. Replace the fuse as needed.
Is the fuse OK?–Go to Step 3Go to
”Diagnostic
Aids”

ENGINE CONTROLS 1F – 103
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
20Check the wire between the cooling fan control relay
connector terminal 87A and the auxiliary cooling fan
connector terminal 2 for an open.
Is the problem found?–Go to Step 22Go to Step 21
21Check for an open wire between the auxiliary cooling
fan connector terminal 1 and ground.
Is the problem found?–Go to Step 22Go to Step 29
22Repair the open wire as needed.
Is the repair complete?–System OK–
23Repair the open between the cooling fan relay Low
connector terminal 30 and the fuse Ef21.
Is the repair complete?–System OK–
24Repair the open between the cooling fan relay Low
connector terminal 86 and the ignition switch.
Is the repair complete?–System OK–
25Repair the open wire between the cooling fan relay
Low connector terminal 85 and the ECM connector
terminal K28.
Is the repair complete?–System OK–
26Replace the cooling fan relay Low.
Is the repair complete?–System OK–
27Replace the cooling fan control relay.
Is the repair complete?–System OK–
28Replace the main cooling fan.
Is the repair complete?–System OK–
29Replace the auxiliary cooling fan.
Is the repair complete?–System OK–
30Replace the ECM.
Is the repair complete?–System OK–
311. Turn the ignition OFF.
2. Disconnect the main cooling fan connector.
3. Connect a test light between the main cooling
fan connector termina 2 and ground.
4. Turn the A/C switch ON.
5. Start the engine.
Is the test light on?–Go to Step 32Go to Step 12
321. Turn the ignition OFF.
2. Connect a test light between the main cooling
fan connector terminal 1 and battery positive.
3. Turn the A/C switch ON.
4. Start the engine.
Is the test light on?–Go to Step 28Go to Step 17
331. Turn the ignition OFF.
2. Disconnect the cooling fan relay Hi.
3. Connect a test light between the cooling fan
relay Hi connector terminal 86 and ground.
4. Turn the ignition ON.
Is the test light on?–Go to Step 34Go to Step 44

1F – 104IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
341. Turn the ignition OFF.
2. Connect a test light between the cooling fan
relay Hi connector terminal 30 and ground.
Is the test light on?–Go to Step 35Go to Step 45
351. Disconnect the cooling fan control relay.
2. Connect a test light between the cooling fan
control relay connector terminal 85 and ground.
3. Turn the ignition ON.
Is the test light on?–Go to Step 36Go to Step 46
361. Turn the ignition OFF.
2. Connect a test light between the cooling fan
control relay connector terminal 87 and battery
positive.
Is the test light on?–Go to Step 37Go to Step 47
371. Connect the main cooling fan connector.
2. Connect the cooling fan relay Hi.
3. Connect the cooling fan control relay.
4. Disconnect the ECM connector.
5. Connect a fused jumper between the ECM
connector terminal K28 and ground.
6. Connect a fused jumper between the ECM
connector terminal K12 and ground.
7. Turn the ignition ON.
Do the cooling fans run at high speed?–Go to Step 30Go to Step 38
381. Turn the ignition OFF.
2. Check for an open wire between the cooling
fan relay Hi connector terminal 85 and the
ECM connector terminal K12.
Is the problem found?–Go to Step 22Go to Step 39
391. Disconnect the cooling fan relay Hi.
2. Connect a test light between the cooling fan
relay Hi connector terminal 87 and battery posi-
tive.
Is the test light on?–Go to Step 40Go to Step 48
401. Disconnect the ECM connector.
2. Connect a fused jumper between the ECM
connector terminal K12 and ground.
3. Disconnect the cooling fan relay Hi.
4. Connect a test light between the cooling fan
control relay connector terminal 86 and battery
positive.
Is the test light on?–Go to Step 41Go to Step 49

ENGINE CONTROLS 1F – 105
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
411. Connect the cooling fan control relay.
2. Connect a fused jumper between the ECM
connector terminal K12 and ground.
3. Disconnect the cooling fan relay Hi.
4. Connect a fused jumper between the cooling
fan relay Hi connector terminals 30 and 87.
5. Disconnect the low speed cooling fan relay.
6. Connect a fused jumper between the low
speed cooling fan relay connector terminals 30
and 87.
7. Turn the ignition ON.
Do the cooling fans run at high speed?–Go to Step 43Go to Step 42
421. Turn the ignition OFF.
2. Connect a fused jumper between the ECM
connector terminal K12 and ground.
3. Disconnect the cooling fan control relay.
4. Connect a fused jumper between the cooling
fan control relay connector terminals 30 and
87.
5. Connect a fused jumper between the low
speed cooling fan relay connector terminals 30
and 87.
6. Turn the ignition ON.
Do the cooling fans run at high speed?–Go to Step 27–
43Replace the cooling fan relay Hi.
Is the repair complete?–System OK–
44Repair the open wire between the cooling fan relay
Hi connector terminal 86 and the ignition switch.
Is the repair complete?–System OK–
45Repair the open wire between the cooling fan relay
Hi connector terminal 30 and the battery.
Is the repair complete?–System OK–
46Repair the open wire between the cooling fan control
relay connector terminal 85 and the ignition switch
Is the repair complete?–System OK–
47Repair the open wire between the cooling fan control
relay connector terminal 87 and ground.
Is the repair complete?–System OK–
48Repair the open wire between the cooling fan relay
Hi connector terminal 87 and the auxiliary cooling
fan connector terminal 2.
Is the repair complete?–System OK–
49Repair the open wire between the cooling fan control
relay connector terminal 85 and the ECM connector
terminal K12.
Is the repair complete?–System OK–

1F – 106IENGINE CONTROLS
DAEWOO V–121 BL4
DATA LINK CONNECTOR DIAGNOSIS (1.4L/1.6L DOHC)
Circuit Description
The provision for communicating with the Engine Control
Module (ECM) is the Data Link Connector (DLC). It is lo-
cated under the instrument panel. The DLC is used to con-
nect the scan tool. Battery power and ground is supplied
for the scan tool through the DLC. The Keyword 2000 seri-
al data circuit to the DLC allows the ECM to communicate
with the scan tool. A Universal Asynchronous Receiver
Transmitter (UART) serial data line is used to communi-
cate with the other modules such as the Electronic Brake
Control Module (EBCM), the Supplemental Inflatable Re-
straint (SIR) system. and the Instrument Panel Cluster.
Diagnostic Aids
Ensure that the correct application (model line, car year,
etc.) has been selected on the scan tool. If communication
still cannot be established, try the scan tool on another ve-
hicle to ensure that the scan tool or cables are not the
cause of the condition.
An intermittent may be caused by a poor connection,
rubbed through wire insulation, or a broken wire inside the
insulation.
Any circuitry that is suspected of causing an intermittent
complaint should be thoroughly checked for the following
conditions:
S Backed–out terminals.S Improper mating of terminals.
S Broken locks.
S Improperly formed or damaged terminals.
S Poor terminal–to–wiring connection.
S Physical damage to the wiring harness.
S Corrosion.
Test Description
Number(s) below refer to the step number(s) on the Diag-
nostic Table.
1. The On–Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
2. Unlike the UART serial data circuit, the only time a
Class II serial data circuit has any voltage on it is
when a scan tool asks the ECM for information and
sends the information out.
5. Locate and repair any shorts that may have caused
the fuse to open before replacement, if the no volt-
age condition was due to an open fuse.
10. The scan tool or associated cables could be mal-
functioning. Refer to the scan tool’s manual for re-
pair information.

ENGINE CONTROLS 1F – 107
DAEWOO V–121 BL4
Data Link Connector Diagnosis (1.4L/1.6L DOHC)
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) system
check.
Was the check performed?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
2With a test light connected to the ground, probe the
Data Link Connector (DLC) battery feed terminal 16.
Is the test light illuminate?–Go to Step 4Go to Step 3
3Repair an open or short to ground in the DLC battery
feed circuit .
Is the repair complete?–Go to Step 4–
4With a test light connected to the battery, probe the
DLC ground terminal 4.
Is the test light illuminate?–Go to Step 6Go to Step 5
5Repair an open circuit.
Is the repair complete?–Go to Step 6–
61. Turn the ignition switch to LOCK.
2. Install the scan tool to the DLC.
3. Turn the ignition switch to ON.
Does the scan tool power up?–Go to Step 8Go to Step 7
7Check for damages in the terminal of DLC and scan
tool, and repair as needed.
Is the repair complete?–Go to Step 8–
8Using a scan tool, request engine data of Engine
Control Module (ECM).
Does the scan tool display any data?–Go to Step 12Go to Step 9
9Install the scan tool on another vehicle and check for
proper operation.
Does the scan tool work properly on a different ve-
hicle.–Go to Step 11Go to Step 10
10The scan tool is malfunctioning.
Refer to the scan tool’s manual for repair.
Is the repair complete?–Go to Step 12–
11Repair communication circuit between ECM and
DLC.
Is the repair complete?–Go to Step 12–
121. Using a scan tool, clear the Diagnostic Trouble
Codes(DTCs).
2. Attempt to start the engine.
Does the engine and continue to run?–Go to Step 13Go to Step 2
131. Allow the engine to idle until normal operation
temperature reached.
2. Check if any DTCs are set?
Are any DTCs displayed that have not been diag-
nosed?–Go to
”Applicable
DTC Table”System OK

1F – 108IENGINE CONTROLS
DAEWOO V–121 BL4
DATA LINK CONNECTOR DIAGNOSIS (1.8L DOHC)
Circuit Description
The provision for communicating with the Engine Control
Module (ECM) is the Data Link Connector (DLC). It is lo-
cated under the instrument panel. The DLC is used to con-
nect the scan tool. Battery power and ground is supplied
for the scan tool through the DLC. The Keyword 2000 seri-
al data circuit to the DLC allows the ECM to communicate
with the scan tool. A Universal Asynchronous Receiver
Transmitter (UART) serial data line is used to communi-
cate with the other modules such as the Electronic Brake
Control Module (EBCM), the Supplemental Inflatable Re-
straint (SIR) system. and the Instrument Panel Cluster.
Diagnostic Aids
Ensure that the correct application (model line, car year,
etc.) has been selected on the scan tool. If communication
still cannot be established, try the scan tool on another ve-
hicle to ensure that the scan tool or cables are not the
cause of the condition.
An intermittent may be caused by a poor connection,
rubbed through wire insulation, or a broken wire inside the
insulation.
Any circuitry that is suspected of causing an intermittent
complaint should be thoroughly checked for the following
conditions:
S Backed–out terminals.S Improper mating of terminals.
S Broken locks.
S Improperly formed or damaged terminals.
S Poor terminal–to–wiring connection.
S Physical damage to the wiring harness.
S Corrosion.
Test Description
Number(s) below refer to the step number(s) on the Diag-
nostic Table.
1. The On–Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
2. Unlike the UART serial data circuit, the only time a
Class II serial data circuit has any voltage on it is
when a scan tool asks the ECM for information and
sends the information out.
5. Locate and repair any shorts that may have caused
the fuse to open before replacement, if the no volt-
age condition was due to an open fuse.
10. The scan tool or associated cables could be mal-
functioning. Refer to the scan tool’s manual for re-
pair information.

ENGINE CONTROLS 1F – 109
DAEWOO V–121 BL4
Data Link Connector Diagnosis (1.8L DOHC)
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) system
check.
Was the check performed?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
2With a test light connected to the ground, probe the
Data Link Connector (DLC) battery feed terminal 16.
Is the test light illuminate?–Go to Step 4Go to Step 3
3Repair an open or short to ground in the DLC battery
feed circuit .
Is the repair complete?–Go to Step 4–
4With a test light connected to the battery, probe the
DLC ground terminal 4 and 5.
Is the test light illuminate?–Go to Step 6Go to Step 5
5Repair an open circuit.
Is the repair complete?–Go to Step 6–
61. Turn the ignition switch to LOCK.
2. Install the scan tool to the DLC.
3. Turn the ignition switch to ON.
Does the scan tool power up?–Go to Step 8Go to Step 7
7Check for damages in the terminal of DLC and scan
tool, and repair as needed.
Is the repair complete?–Go to Step 8–
8Using a scan tool, request engine data of Engine
Control Module (ECM).
Does the scan tool display any data?–Go to Step 12Go to Step 9
9Install the scan tool on another vehicle and check for
proper operation.
Does the scan tool work properly on a different ve-
hicle.–Go to Step 11Go to Step 10
10The scan tool is malfunctioning.
Refer to the scan tool’s manual for repair.
Is the repair complete?–Go to Step 12–
11Repair communication circuit between ECM and
DLC.
Is the repair complete?–Go to Step 12–
121. Using a scan tool, clear the Diagnostic Trouble
Codes(DTCs).
2. Attempt to start the engine.
Does the engine and continue to run?–Go to Step 13Go to Step 2
131. Allow the engine to idle until normal operation
temperature reached.
2. Check if any DTCs are set?
Are any DTCs displayed that have not been diag-
nosed?–Go to
”Applicable
DTC Table”System OK

ENGINE CONTROLS 1F – 111
DAEWOO V–121 BL4
TROUBLE CODE DIAGNOSIS
(1.4L/1.6L DOHC)
CLEARING TROUBLE CODES
Notice : To prevent Engine Control Module (ECM) dam-
age, the key must be OFF when disconnecting or recon-
necting the power to the ECM (for example battery cable,
ECM pigtail connector, ECM fuse, jumper cables,
etc.).When the ECM sets a Diagnostic Trouble Code
(DTC), the Malfunction Indicator Lamp (MIL) lamp will be
turned on only for type A, B and E but a DTC will be stored
in the ECM’s memory for all types of DTC. If the problemis intermittent, the MIL will go out after 10 seconds if the
fault is no longer present. The DTC will stay in the ECM’s
memory until cleared by scan tool. Removing battery volt-
age for 10 seconds will clear some stored DTCs.
DTCs should be cleared after repairs have been com-
pleted. Some diagnostic tables will tell you to clear the
codes before using the chart. This allows the ECM to set
the DTC while going through the chart, which will help to
find the cause of the problem more quickly.
DIAGNOSTIC TROUBLE CODES (1.4L/1.6L DOHC)
DTCFunctionError
TypeIlluminate MIL
P0107Manifold Absolute Pressure Sensor Low VoltageAYES
P0108Manifold Absolute Pressure Sensor High VoltageAYES
P0112Intake Air Temperature Sensor Low VoltageEYES
P0113Intake Air Temperature Sensor High VoltageEYES
P0117Engine Coolant Temperature Sensor Low VoltageAYES
P0118Engine Coolant Temperature Sensor High VoltageAYES
P0122Throttle Position Sensor Low VoltageAYES
P0123Throttle Position Sensor High VoltageAYES
P0131Front Heated Oxygen Sensor Low VoltageAYES
P0132Front Heated Oxygen Sensor High VoltageAYES
P0133Front Heated Oxygen Sensor No ActivityEYES
P0135Front Heated Oxygen Sensor Heater Circuit Not FunctioningEYES
P0137Rear Heated Oxygen Sensor Low VoltageEYES
P0138Rear Heated Oxygen Sensor High VoltageEYES
P0140Rear Heated Oxygen Sensor No ActivityEYES
P0141Rear Heated Oxygen Sensor Heater MalfuctionEYES
P0171Fuel Trim System Too LeanEYES
P0172Fuel Trim System Too RichEYES
P0222Main Throttle Idle Actuactor (MTIA) Low VoltageAYES
P0223Main Throttle Idle Actuactor (MTIA) High VoltageAYES
P0261Injector 1 Low VoltageAYES
P0262Injector 1 High VoltageAYES
P0264Injector 2 Low VoltageAYES
P0265Injector 2 High VoltageAYES
P0267Injector 3 Low VoltageAYES
P0268Injector 3 High VoltageAYES
P0270Injector 4 Low VoltageAYES
P0271Injector 4 High VoltageAYES
P0300Multiple Cylinder Misfire (Catalyst Damage)ABLINKING