Daewoo CIELO EURO III Manual page 231

Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the check completed?
1. Turn the ignition OFF.
2. Connect the idle air control driver to the Idle Air
Control (IAC) valve.
3. Connect a scan tool to the Data Link Connector
(DLC).
2
4. Start the engine.
5. With the IAC driver, extend and retract the IAC
valve. Engine rpm should increase and decrease
as the IAC valve is cycled.
Does the engine rpm change?
1. Remove the IAC valve.
3 2. Inspect the IAC passages for restrictions.
Is the problem found?
Clean the IAC passages.
4
Is the repair complete?
1. Turn the ignition OFF.
2. Start the engine.
3. Using the IAC driver, extend and retract the IAC
5
valve. Engine rpm should increase and decrease
as the IAC valve is cycled.
Does the rpm change smoothly within the value spe-
cified with each flash of the IAC driver?
1. Turn the ignition OFF.
2. Connect the IAC driver to the IAC valve.
3. Install an IAC node light to the IAC valve
connector.
6 4. Start the engine.
5. Cycle the IAC driver.
6. Watch the node lights of the IAC driver.
Do both lights cycle red and green but never off as
the rpm is changed?
1. Measure the resistance of the IAC valve between
terminals A and B.
2. Measure the resistance of the IAC valve between
7
terminals C and D.
Does the resistance measure within the value speci-
fied?
1. Measure the resistance of the IAC valve between
terminals B and C.
8 2. Measure the resistance of the IAC valve between
terminals A and D.
Does the ohmmeter show the specified value?
Inspect the IAC connector terminals.
9
Is the problem found?
Repair or replace the IAC connector terminals as
needed.
10
Is the repair complete?
DAEWOO T-154 BL2,3
Idle Air Control System Check
Action
ENGINE CONTROLS 1F – 63
Value(s) Yes
–
Go to Step 2
–
Go to Step 5
–
Go to Step 4
– System OK
700-1500
Go to Step 6
rpm
–
Go to Step 7
40-80 Go to Step 8
Go to
"Diagnostic
Aids"
– Go to Step 10
–
System OK
No
Go to
"On-Board
Diagnostic
System Check"
Go to Step 3
Go to Step 19
–
Go to Step 3
Go to Step 9
Go to Step 19
Go to Step 19
Go to Step 11
–