Daewoo Nubira. Manual — part 114
1F – 38
I
ENGINE CONTROLS
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
11
1. Turn the ignition OFF.
2. Disconnect the Crankshaft Position (CKP) sen-
sor connector.
3. Turn the ignition ON.
4. Measure the voltage between the CKP connec-
tor terminals 1 and 3.
Does the voltage measure near the value specified?
1.08 volts
Go toStep 12
Go toStep 13
12
Measure the voltage between the CKP connector
terminals 2 and 3.
Does the voltage measure near the value specified?
1.08 volts
Go toStep 19
Go toStep 14
13
Measure the voltage between the CKP connector
terminals 1 and ground.
Does the voltage measure near the value specified?
1.08 volts
Go toStep 15
Go toStep 16
14
Measure the voltage between the CKP connector
terminals 2 and ground.
Does the voltage measure near the value specified?
1.08 volts
Go toStep 15
Go toStep 17
15
Check for an open or short in the wire between the
CKP connector terminal 3 and ground.
Is the problem found?
Go toStep 18
Go toStep 33
16
Check for an open or short in the wire between the
CKP connector terminal 1 and the powertrain control
module (PCM)/engine control module (ECM) con-
nector terminal C6.
Is the problem found?
Go toStep 18
Go toStep 33
17
Check for an open or short in the wire between the
CKP connector terminal 2 and the PCM/ECM con-
nector terminal C5.
Is the problem found?
Go toStep 18
Go toStep 33
18
Repair the wiring as needed.
Is the repair complete?
Go toStep 2
19
1. Disconnect the electronic ignition (EI) system
ignition coil connector to prevent the vehicle
from starting.
2. Measure the voltage at the PCM/ECM connec-
tor terminal C6 by backprobing the PCM/ECM
connector.
Are the voltage readings near the values specified?
1.08 v with igni-
tion ON, 1.20 v
during cranking
Go toStep 20
Go toStep 21
20
Measure the voltage at the PCM/ECM connector
terminal C5 by backprobing the PCM/ECM connec-
tor.
Are the voltage readings near the values specified?
1.08 v with igni-
tion ON, 1.20 v
during cranking
Go toStep 22
Go toStep 21
21
Replace the CKP sensor.
Is the repair complete?
Go toStep 2
22
1. Turn the ignition OFF.
2. Disconnect the electrical connector at the EI
system ignition coil.
3. Connect a test light between terminal D of the
EI system ignition coil connector and ground.
4. Turn the ignition ON.
Is the test light on?
Go toStep 23
Go toStep 24
ENGINE CONTROLS 1F – 39
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
23
Connect a test light between terminal C of the EI sys-
tem ignition coil connector and battery positive.
Is the test light on?
Go toStep 27
Go toStep 25
24
Check for an open in the wiring between the battery
and the EI system ignition coil connector terminal D.
Is the problem found?
Go toStep 26
Go to”Ignition 1
Relay Circuit
Check”
25
Check for an open in the wire from the EI system
ignition coil to ground.
Is the problem found?
Go toStep 26
26
1. Repair the wiring as needed.
2. Connect the EI system ignition coil connector.
3. Check for the presence of spark from all of the
ignition wires.
Is spark present from all of the ignition wires?
Go toStep 2
Go toStep 27
27
1. Turn the ignition OFF.
2. Disconnect the EI system ignition coil connec-
tor.
3. While cranking the engine, measure the volt-
age at the EI system ignition coil connector
terminal B.
Does the voltage fluctuate within the values speci-
fied?
0.2–2.0 v
Go toStep 28
Go toStep 29
28
While cranking the engine, measure the voltage at
the EI system ignition coil connector terminal A.
Does the voltage fluctuatewithin the values speci-
fied?
0.2–2.0 v
Go toStep 32
Go toStep 30
29
Check for an open in the wire from the EI system
ignition coil connector terminal B to the PCM/ECM
connector terminal C4.
Is the problem found?
Go toStep 31
Go toStep 33
30
Check for an open in the wire from the EI system
ignition coil connector terminal A to the PCM/ECM
connector terminal D5.
Is the problem found?
Go toStep 31
Go toStep 33
31
1. Repair the wiring as needed.
2. Connect the EI system ignition coil connector.
3. Check for the presence of spark from all of the
ignition wires.
Is spark present from all of the ignition wires?
Go toStep 2
Go toStep 32
32
Replace the EI system ignition coil.
Is the repair complete?
Go toStep 2
33
Replace the PCM/ECM.
Is the repair complete?
Go toStep 2
34
1. Turn the ignition OFF.
2. Connect a fuel pressure gauge.
3. Crank the engine.
Is any fuel pressure present?
Go toStep 37
Go toStep 35
1F – 40
I
ENGINE CONTROLS
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
35
1. Turn the ignition OFF.
2. Disconnect the electrical connector at the fuel
pump.
3. Connect a test light between the fuel pump
connector terminals 3 and 2.
4. Turn the ignition ON.
5. With the ignition ON, the test light should light
for the time specified.
Is the test light on?
2 sec
Go toStep 36
Go toStep 46
36
Replace the fuel pump.
Is the repair complete?
Go toStep 2
37
Is the fuel pressure within the value specified?
283–324 kPa
(41–47 psi)
Go toStep 41
Go toStep 38
38
1. Check the fuel filter for a restriction.
2. Inspect the fuel lines for kinks and restrictions.
Is the problem found?
Go toStep 39
Go toStep 40
39
1. Replace the fuel filter and/or the fuel lines as
needed.
2. Connect a fuel pressure gauge.
3. Crank the engine.
Is the fuel pressure within the value specified?
283–324 kPa
(41–47 psi)
Go toStep 2
Go toStep 40
40
1. Disconnect the vacuum line from the fuel pres-
sure regulator.
2. Inspect the vacuum line for the presence of
fuel.
3. Inspect the fuel pressure regulator vacuum port
for the presence of fuel.
Is any fuel present?
Go toStep 43
Go toStep 44
41
Check the fuel for contamination.
Is the fuel contaminated?
Go toStep 42
Go toStep 58
42
1. Remove the contaminated fuel from the fuel
tank.
2. Clean the fuel tank as needed.
Is the repair complete?
Go toStep 2
43
Replace the fuel pressure regulator.
Is the repair complete?
Go toStep 2
44
1. Remove the fuel pump assembly from the fuel
tank.
2. Inspect the fuel pump sender and the fuel cou-
pling hoses for a restriction.
3. Inspect the in–tank fuel filter for a restriction.
Is the problem found?
Go toStep 45
Go toStep 36
45
Replace the fuel pump sender, the in–tank fuel filter,
and/or the fuel coupling hoses as needed.
Is the repair complete?
Go toStep 2
ENGINE CONTROLS 1F – 41
DAEWOO V–121 BL4
Step
No
Yes
Value(s)
Action
46
1. Turn the ignition OFF.
2. Disconnect the electrical connector at the fuel
pump.
3. Connect a test light between the fuel pump
connector terminal 3 and a known good
ground.
4. Turn the ignition ON.
5. With the ignition ON, the test light should illumi-
nate for the time specified.
Is the test light on?
2 sec
Go toStep 47
Go toStep 48
47
Repair the open wire between the fuel pump connec-
tor terminal 2 and ground.
Is the repair complete?
Go toStep 2
48
1. Turn the ignition OFF.
2. Disconnect the fuel pump relay.
3. Connect a test light between the fuel pump
relay connector terminal 85 and ground.
4. Turn the ignition ON.
Is the test light on?
Go toStep 49
Go toStep 60
49
1. Turn the ignition OFF.
2. Connect a test light between the fuel pump
relay connector terminal 86 and terminal 85.
3. Turn the ignition ON.
4. With the ignition ON, the test light should light
for the time specified.
Is the test light on?
2 sec
Go toStep 50
Go toStep 52
50
1. Turn the ignition OFF.
2. Connect a test light between the fuel pump
relay connector terminal 30 and ground.
Is the test light on?
Go toStep 51
Go toStep 63
51
1. Turn the ignition ON.
2. Measure the voltage at the fuse EF19 connec-
tion.
Is the voltage within the specified value?
11–14 v
Go toStep 53
Go toStep 52
52
Replace the fuel pump relay.
Is the repair complete?
Go toStep 2
53
Measure the voltage at the fuse EF19 again.
Is the voltage within the specified value?
11–14 v
Go toStep 55
Go toStep 54
54
Replace the engine fuse block.
Is the repair complete?
Go toStep 2
55
1. Disconnect the fuel cutoff switch connector.
2. Measure the voltage at terminal 1 of the fuel
cutoff switch connector.
Is the voltage within the specified value?
11–14 v
Go toStep 57
Go toStep 56
56
Repair the open or short between the fuel cutoff
switch and fuse EF19.
Is the repair complete?
Go toStep 2
57
1. Reconnect the fuel cutoff switch.
2. Measure the voltage at terminal 3 of the fuel
cutoff switch connector.
Is the voltage within the specified value?
11–14 v
Go toStep 58
Go toStep 59
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