Daewoo NUBIRA, User Manual

Page: 563 / 685

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