Daewoo Nubira. Manual — part 119
1F – 360
I
ENGINE CONTROLS
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
10
1. Check the fuel injector driver circuit.
2. Disconnect all of the fuel injector harness con-
nectors at the fuel injectors.
3. Connect an injector test light between the har-
ness terminals of each fuel injector connector.
4. Note the test light while cranking the engine.
Does the test light blink at all connectors?
Go toStep 13
Go toStep 11
11
Check the fuel injector driver wiring harness, the
connectors, and the connector terminals for the
proper connections.
Is the problem found?
Go toStep 12
Go toStep 30
12
Repair the wiring harness, the connector, or the con-
nector terminal as needed.
Is the repair complete?
System OK
13
Measure the resistance of each fuel injector at 68
³
F
(20
³
C). The resistance will increase slightly at high-
er temperatures.
Is the fuel injector resistance within the value speci-
fied?
11.6–12.4
Ω
Go toStep 15
Go toStep 14
14
Replace any fuel injector with a resistance that is out
of specifications.
Is the repair complete?
System OK
15
Perform an injector balance test.
Is the problem found?
Go toStep 16
Go toStep 17
16
Replace any restricted or leaking fuel injectors as
needed.
Is the repair complete?
System OK
17
1. Check for the proper ignition voltage output for
each cylinder with a spark tester.
2. Inspect the spark plugs for cracks, wear, im-
proper gap, burned electrodes, or heavy de-
posits.
3. Inspect the ignition wires for short conditions.
4. Inspect all of the ignition grounds for loose con-
nections.
5. Inspect the powertrain control module
(PCM)/engine control module (ECM) for the
proper operation.
Is the problem found?
Go toStep 18
Go toStep 19
18
Correct or replace any faulty ignition components.
Is the repair complete?
System OK
19
Does the engine misfire or cut out under load or at
idle?
Go to”Ignition
System Check”
Go toStep 20
20
Does the engine start, but then immediately stall?
Go toStep 21
Go toStep 23
21
1. Remove the Crankshaft Position (CKP) sensor.
2. Inspect for faulty connections and repair as
needed.
Is the problem found?
Go toStep 22
Go toStep 25
22
Repair the faulty connections as needed.
Is the repair complete?
System OK
ENGINE CONTROLS 1F – 361
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
23
1. Check for the proper valve timing.
2. Check the cylinder compression.
3. Inspect the pushrods, the rocker arms, the
valve springs, and the camshaft lobes for ex-
cessive wear.
4. Inspect the intake manifold and the exhaust
manifold passages for casting flash.
Is the problem found?
Go toStep 24
Go toStep 25
24
Repair or replace any components as needed.
Is the repair complete?
System OK
25
Check the Idle Air Control (IAC) valve operation. Re-
pair or replace components as needed.
Is the repair complete?
System OK
26
Check the base idle setting of the throttle body.
Is the repair complete?
Go toStep 27
Go toStep 28
27
Check the Throttle Position (TP) sensor circuit for
proper operation. Repair or replace components as
needed.
Is the repair complete?
System OK
28
Adjust the base idle setting to specifications.
Is the repair complete?
System OK
29
Repair the fuel system as needed.
Is the repair complete?
System OK
30
Replace the PCM/ECM.
Is the repair complete?
System OK
SURGES OR CHUGGLES
Engine power varies under steady throttle or cruise,
making it feel as if the vehicle speeds up and slows
down with no change in the accelerator pedal
position.
Important : Make sure the driver understands Torque
Converter Clutch (TCC) and A/C compressor operation as
described in the owner’s manual
The speedometer reading and the speed reading on the
scan tool should be equal.
Before diagnosing the symptom, check service bulletins
for updates.
Step
Action
Value(s)
Yes
No
1
Were the Important Preliminary Checks performed?
Go toStep 2
Go to”Impor-
tant Preliminary
Checks”
2
Connect the scan tool to the Data Link Connector
(DLC).
Does the Oxygen Sensor (O2S) respond quickly to
different throttle positions?
Go toStep 4
Go toStep 3
3
1. Check the O2S sensor for silicone or other
contaminants from fuel or use of improper
Room Temperature Vulcanizing (RTV) sealant.
2. Replace the contaminated O2S sensor.
Is the repair complete?
System OK
1F – 362
I
ENGINE CONTROLS
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
4
1. Drive the vehicle at the speed of the complaint.
2. Monitor the long term fuel trim reading using
the scan tool.
Is the long term fuel trim reading within the value
specified?
115–150
counts
Go toStep 7
Go toStep 5
5
Is the long term fuel trim reading below the value
specified?
115 counts
Go to”Diagnos-
tic Aids for
DTC P0172”
Go toStep 6
6
Is the long term fuel trim reading above the value
specified?
150 counts
Go to”Diagnos-
tic Aids for
DTC P0171”
7
Check the fuel system pressure while the condition
exists.
Is the fuel system pressure within specifications?
41–47 psi
(284–325 kPa)
Go toStep 8
Go toStep 17
8
Check the in–line fuel filter.
Is the filter dirty or plugged?
Go toStep 18
Go toStep 9
9
Perform an injector diagnosis.
Does the injector balance test pinpoint the problem?
Go toStep 19
Go toStep 10
10
1. Check for proper ignition voltage output using a
spark tester.
2. Inspect the spark plugs for cracks, wear, im-
proper gap, burned electrodes, or heavy de-
posits.
Is the problem found?
Go toStep 11
Go toStep 12
11
Repair or replace any ignition system components
as needed.
Is the repair complete?
System OK
12
1. Inspect the powertrain control module
(PCM)/engine control module (ECM) grounds
to make sure they are clean, tight, and in their
proper locations.
2. Inspect the vacuum lines for kinks or leaks.
Is the problem found?
Go toStep 13
Go toStep 14
13
Repair the electrical connections or the vacuum
lines as needed.
Is the repair complete?
System OK
14
Check the generator output voltage.
Is the generator voltage within the value specified?
12–16 v
Go toStep 16
Go toStep 15
15
Repair the generator.
Is the repair complete?
System OK
16
1. Check for intermittent Exhaust Gas Recircula-
tion (EGR) valve operation.
2. Check Torque Converter Clutch (TCC) opera-
tion.
3. Repair or replace any components as needed.
Is the repair complete?
System OK
17
Repair the fuel system as needed.
Is the repair complete?
System OK
ENGINE CONTROLS 1F – 363
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
18
Replace the fuel filter.
Is the repair complete?
System OK
19
Replace the leaking or restricted fuel injectors.
Is the repair complete?
System OK
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