light DAEWOO NUBIRA 2004 Service Workshop Manual

1F – 96IENGINE CONTROLS
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 Ef11.
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 10.
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

ENGINE CONTROLS 1F – 97
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 10 and ground.
6. Connect a fused jumper between the ECM
connector terminal 9 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 9.
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 9 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 – 101
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
31. Check the engine fuse block fuse Ef21, Ef6,
Ef8.
2. Replace the fuse as needed.
Is the fuse OK?–Go to Step 4Go to
”Diagnostic
Aids”
41. Turn the ignition OFF.
2. Turn the A/C switch OFF.
3. Connect a scan tool to the data link connector
(DLC).
4. The cooling fans should run at low speed when
the coolant temperature reaches 97°C
(207°F).
Do the cooling fans run at low speed?–Go to Step 5Go to Step 10
51. Turn the ignition OFF.
2. Turn the A/C switch OFF.
3. Connect a scan tool to the DLC.
4. Start the engine.
5. The cooling fans should run at high speed
when the coolant temperature reaches 101°C
(214°F).
Do the cooling fans run at high speed?–Go to Step 6Go to Step 33
61. Turn the ignition OFF.
2. Start the engine.
3. Turn the A/C switch ON.
Does the A/C compressor clutch engage?–Go to Step 8Go to Step 7
71. Diagnose the A/C compressor clutch circuit.
2. Repair the A/C compressor clutch circuit as
needed.
3. Start the engine.
4. Turn the A/C switch ON.
Does the A/C compressor clutch engage?–Go to Step 8–
8Do the cooling fans run at low speed?–Go to Step 9Go to Step 31
91. Turn the ignition OFF.
2. Connect the A/C pressure gauges.
3. Start the engine.
4. Turn the A/C switch ON.
5. The cooling fans should run at high speed
when the high side A/C pressure reaches 1
882 kPa (273 psi).
Do the cooling fans run at high speed?–Go to Step 10–
101. Turn the ignition OFF.
2. Connect a scan tool to the DLC.
3. The coolant temperature should be above
97°C (207°C).
4. Disconnect the main cooling fan connector.
5. Turn the ignition ON.
6. Connect a test light between the main cooling
fan connector terminal 2 and ground.
Is the test light on?–Go to Step 11Go to Step 12

1F – 102IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
111. Turn the ignition OFF.
2. Connect a scan tool to the DLC.
3. The coolant temperature should be above
97°C (207°C).
4. Disconnect the main cooling fan connector.
5. Connect a test light between the main cooling
fan connector terminal 1 and ground.
Is the test light on?–Go to Step 28Go to Step 17
121. Turn the ignition OFF.
2. Disconnect the cooling fan relay Low.
3. Connect a test light between the cooling fan
relay Low connector terminal 85 and ground.
4. Turn the ignition ON.
Is the test light on?–Go to Step 13Go to Step 24
131. Turn the ignition OFF.
2. Connect the cooling fan relay Low.
3. Disconnect engine control module (ECM) white
connector.
4. Connect a fused jumper between the ECM
connector terminal K28 and ground.
5. Turn the ignition ON.
Do the cooling fans run at low speed?–Go to Step 30Go to Step 14
14Check for an open wire between the low speed cool-
ing fan relay connector terminal 85 and the ECM
connector terminal K28.
Is the problem found?–Go to Step 25Go to Step 15
151. Turn the ignition OFF.
2. Disconnect the cooling fan relay Low.
3. Connect a test light between the cooling fan
relay Low connector terminal 30 and ground.
Is the test light on?–Go to Step 16Go to Step 23
16Connect a fused jumper between the cooling fan
relay Low connector terminals 30 and 87.
Do the cooling fans run at low speed?–Go to Step 26Go to Step 17
171. Disconnect the cooling fan control relay.
2. Connect a fused jumper between the cooling
fan relay Low connector terminals 30 and 87.
3. Connect a fused jumper between the cooling
fan control relay connector terminals 30 and
87.
Do the cooling fans run at low speed?–Go to Step 27Go to Step 18
18Check the wire between the cooling fan relay Low
connector terminal 87 to the main cooling fan con-
nector terminal 2 for an open.
Is the problem found?–Go to Step 22Go to Step 19
19Check the wire between the main cooling fan con-
nector terminal 1 and the cooling fan control relay
connector terminal 30 for an open.
Is the problem found?–Go to Step 22Go to Step 20

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 – 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

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

1F – 146IENGINE CONTROLS
DAEWOO V–121 BL4
S Damaged harness
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. This step determines if DTC P0135 is the result of
a hard failure or an intermittent condition. With the
ignition ON, engine OFF, the HO2S1 voltage dis-played on the scan tool should change within sever-
al minutes toward 0 or 1 volt, indicating that the
heater is working properly.
3. Probing terminal 4 of the HO2S1 connector verifies
if voltage is available to the HO2S1 heater.
4. If voltage is available at the connector, than it be-
comes a good voltage source to check for a ground
at terminal 3.
5. Determines if voltage is not available at the HO2S1
due to an open in the HO2S1 fuse or open ignition
feed circuit. If the fuse is open, determine if it was
due to a short in the ignition feed circuit before re-
placing the fuse.
DTC P0135 – Front Heated Oxygen Sensor Heater Circuit Not
Functioning
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the check complete?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
2Notice : If the engine has just been operating, allow
the engine to cool for about one–half hour before
proceeding.
1. Turn the ignition switch ON, with the engine
OFF.
2. Install a scan tool.
Does the Front Heated Oxygen Sensor (HO2S1)
voltage gradually change toward the specified volt-
age?0 v or 1 vGo to Step 13Go to Step 3
31. Disconnect the HO2S1 electrical connector.
2. With a test light connected to ground, probe
the ignition feed circuit, terminal 2 of the con-
nector.
Does the test light illuminate?–Go to Step 4Go to Step 5
4Connect a test light between the ignition feed and
ground circuits, terminal 2 and 3 of the connector.
Does the test light illuminate?–Go to Step 6Go to Step 7
5Inspect the fuse in the engine fuse block.
Is the fuse open?–Go to Step 8Go to Step 9
6Check the connections terminal 2 and 1 at the
HO2S2 connector and repair as necessary.
Is a repair necessary?–Go to Step 13Go to Step 10
7Check the connections terminal 4 at the HO2S1 con-
nector and repair as necessary.
Is a repair necessary?–Go to Step 13Go to Step 11
81. Check for a short to ground in the HO2S1 igni-
tion feed circuit and repair as necessary?
2. Replace open fuse.
Is the action complete?–Go to Step 13–

1F – 160IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
8Lean condition is not present.
Does a driveability problem exist?–Go to
”Symptom
Diagnosis”Go to Step 16
91. Visually/physically inspect the following items
for vacuum leaks:
S Intake manifold.
S Throttle body.
S Injector O–rings.
2. Repair any leaks found as necessary.
Is the repair complete?–Go to Step 16Go to Step 16
10Allow the engine to idle.
Are the Idle Air Control (IAC) counts above the spe-
cified value?5Go to Step 11Go to Step 12
11Check the fuel for excessive water, alcohol, or other
contaminants and correct the contaminated fuel
condition if present.
Is the repair complete?–Go to Step 16Go to Step 13
12Check the IAC valve performance. Refer to ”DTC
P0506 Idle Speed RPM Lower Than Desired Idle
Speed” or ”DTC P0507 Idle Speed RPM Higher
Than Desired Idle Speed” in this section and repair
as necessary.
Is the repair complete?–Go to Step 16Go to Step 13
131. Connect a fuel pressure gauge to the fuel sys-
tem.
2. Turn the ignition OFF for at least 10 seconds.
3. Turn the ignition ON, with the engine OFF. The
fuel pump will run for approximately 2–3 sec-
onds. It may be necessary to cycle the ignition
switch ON more than once to obtain maximum
fuel pressure.
4. Note the fuel pressure with the fuel pump run-
ning. The pressure should be within the speci-
fied value. When the fuel pump stops, the pres-
sure may vary slightly then hold steady.
Is the fuel pressure steady and does the fuel pres-
sure hold?241–276 kPa
(35–40 psi)Go to Step 14Go to
”Fuel System
Diagnosis”
141. Start and idle the engine at normal operating
temperature.
2. The fuel pressure noted in the above step
should drop by the indicated value.
Does the fuel pressure drop by the indicated value?21–69 kPa
(3–10 psi)Go to
”Fuel Injector
Balance Test”Go to
”Fuel System
Diagnosis”
15Replace the MAP sensor.
Is the action complete?–Go to Step 16–