ENGINE CONTROLS 1F – 369
DAEWOO V–121 BL4
Step NoYesValue(s)Action
7
1. Perform a cylinder compression test.
2. If the compression is low, repair the engine as
needed.
3. Inspect for proper valve timing, bent pushrods,
worn rocker arms, broken or weak valve
springs, and worn camshaft lobes.
4. Inspect the intake manifold and the exhaust
manifold passages for casting flash.
Is the problem found?
Go toStep 8 Go toStep 9
8 Repair or replace any components as needed.
Is the repair complete?
System OK
9
1. Check the fuel system for a plugged in–line fuel
filter.
2. Check the fuel system for low fuel pressure. If
the fuel pressure is below the value specified,
service the fuel system as needed.
3. Inspect for contaminated fuel.
Is the problem found?
41–47 psi
(284–325 kPa)
Go toStep 10 Go toStep 11
10 Repair or replace any components as needed.
Is the repair complete?
System OK
11
1. Disconnect all of the fuel injector harness con-
nectors at the fuel injectors.
2. Connect an injector test light to the harness
terminals of each fuel injector connector.
3. Note the test light while cranking the engine for
each fuel injector.
Does the test light blink for all of the fuel injectors?
Go toStep 13 Go toStep 12
12
1. Repair or replace the faulty injector drive circuit
harness, the connector, or the connector termi-
nal.
2. If the harness, the connectors, and the termi-
nals are OK, replace the powertrain control
module (PCM)/engine control module (ECM).
Is the repair complete?
System OK
13 Measure the resistance of each fuel injector. The re-
sistance will increase slightly at higher tempera-
tures.
Is the injector resistance within the value specified?
11.6–12.4 Ω Go toStep 15 Go toStep 14
14 Replace any fuel injectors 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.
Is the repair complete?
System OK
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