Daewoo CIELO EURO III Manual page 538

1F – 368 ENGINE CONTROLS
Step
1. Drive the vehicle at the speed of the complaint.
2. Monitor the long term fuel trim reading using the
4 scan tool.
Is the long term fuel trim reading within the value
specified?
Is the long term fuel trim reading below the value
5 specified?
Is the long term fuel trim reading above the value
6 specified?
Check the fuel system pressure while the condition
exists.
7
Is the fuel system pressure within specifications?
Check the in-line fuel filter.
8
Is the filter dirty or plugged?
Perform an injector balance test.
9
Did the injector balance test pinpoint the problem?
1. Check for proper ignition voltage output using a
spark tester.
10 2. Inspect the spark plugs for cracks, wear, improper
gap, burned electrodes, or heavy deposits.
Is the problem found?
Repair or replace any ignition system components
as needed.
11
Is the repair complete?
1. Inspect the
engine control module (ECM) grounds for
being clean, tight, and in their proper locations.
12
2. Inspect the vacuum lines for kinks or leaks.
Is the problem found?
Repair the electrical connections or the vacuum
lines as needed.
13
Is the repair complete?
Check the generator output voltage.
14
Is the generator voltage within the value specified?
Repair the generator.
15
Is the repair complete?
1. Check for intermittent Exhaust Gas Recirculation
(EGR) valve operation.
16
3. Repair or replace any components as needed.
Is the repair complete?
Repair the fuel system as needed.
17
Is the repair complete?
Replace the fuel filter.
18
Is the repair complete?
Replace the leaking or restricted fuel injectors.
19
Is the repair complete?
Surges or Chuggles (Cont'd)
Action Value(s) Yes
Go to Step 7
–20%~25%
Go to
"Diagnostic Aids
for DTC P0172"
–20%
Go to
"Diagnostic Aids
for DTC P0171"
25%
284-325 kPa
Go to Step 8
(41-47 psi)
Go to Step 18
–
Go to Step 19
–
–
Go to Step 11
–
System OK
–
Go to Step 13
–
System OK
Go to Step 16
12-16 v
System OK
–
–
System OK
System OK
–
System OK
–
System OK
–
No
Go to Step 5
Go to Step 6
–
Go to Step 17
Go to Step 9
Go to Step 10
Go to Step 12
–
Go to Step 14
–
Go to Step 15
–
–
–
–
–
DAEWOO T-154 BL2,3