Daewoo MATIZ Service Manual page 345

D Excessive engine overloading. Check for seized pul-
leys, pumps, or motors on the accessory drive,
DTC P0505 Idle Air Control Valve (IACV) Circuit Fault
Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Was the check performed?
1. Install a scan tool to the Data Link Connector
(DLC).
2. Operate the engine to idle speed.
3. Transmission in park or neutral and the parking
brake set.
2
4. A/C is off.
5. Using scan tool, command the Idle Air Control
(IAC) valve up and down between the specified
value.
Does the rpm change smoothly when he
commanded by the scan tool?
1. Turn the ignition OFF.
2. Disconnect the IAC valve connector.
3. Measure the resistance between terminal C and
3 D of the IAC valve.
4. Measure the resistance between terminal B and A
of the IAC valve.
Is the resistance within the specified value?
1. Measure the resistance between terminal D and
B of the IAC valve.
2. Measure the resistance between terminal C and
4
A of the IAC valve.
Is the resistance equal to the specified value?
1. Turn the ignition OFF.
2. Disconnect the IAC valve connector.
3. Turn the ignition ON.
5
4. With test light connected to ground, probe the
IAC connector terminals.
Does the test light illuminate on D terminals?
With test light connected to B+, probe the IAC
connector terminals.
6
Does the test light illuminate on D terminals?
Check for an open or short to ground in the IAC high
and low circuits and repair as needed.
7
Is the repair complete?
1. Idle the engine.
2. Connect a test light to ground, probe the IAC
8 connector terminals.
Does the test light flash On and OFF for all
terminals?
Check for an open or a short to voltage in the IAC
valve high and low circuits and repair as needed.
9
Is the repair complete?
Check the Engine control Module (ECM) connector
for poor connections and repair as needed.
10
Is the repair complete?
DAEWOO M-150 BL2
Action
ENGINE CONTROLS 1F – 247
D Overweight engine oil.
Value(s)
–
Go to Step 2
900–1200
rpm Go to Step 3
40–80 Ω
Go to Step 4
∞
Go to Step 15
–
Go to Step 6
–
Go to Step 8
–
Go to Step 15
–
Go to Step 11
–
Go to Step 15
–
Go to Step 15
Yes No
Go to
"On-Board
Diagnostic
System Check"
Go to Step 5
Go to Step 13
Go to Step 13
Go to Step 7
Go to Step 9
Go to Step 10
Go to Step 12
Go to Step 10
Go to Step 14