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ldle Control System
ldle Control System
i P0505 | fne scan tool indicates Diagnostic Trouble Code (DTC) P0505: ldle control system malfunction,
NOTE: ll DTC Pl508 is stored at the same time as DTC P0505, troubleshoor DTC P1508 first. then troubleshoot DTC P0505.
Possible Cause
.
IAC valve mechanical malfunctiorr
.
Fast idle thermo valve malfunction (A"/T)
. Throttle body clogged port, improper adjustment
. Intake manifold, gasket leakage
. Intake air hose loose, leakage
a Vacuum hoses leakage
. ECT sensor incorrect output
. Throttle Position sensor incorrect output
Troubleshooting Flowchart
Problem verification:
1 . S t a r t t h e e n g i n e . H o l d t h e
engine at 3,000 rpm wath no
load 1in Park or neutral) until
t h e r a d i a t o r f a n c o m e s o n ,
then let it idle.
2. With the scan tool, check the
following items.
-
Throttle position should be
approx. 10% with the throt
tle fully closed.
E n g i n e c o o l a n t t e m p e r a -
ture should be 116 212F
(80 - 100'c).
l f t h e y a r e n o t w i t h i n t h e
spec., repair the faulty sen
sor crrcuft,
3 C h e c k t h e e n g i n e s p e e d a t
i d l e w i t h n o - l o a d c o n d i t i o n s :
h e a d l i g h t s , b l o w e r f a n , r e a r
defogger, radiator fan, and air
conditioner are not operating,
-
The MIL has been reported on.
-
DTC P0505 is stored.
ls it 750 t 50 rpm (81881,
818C1 engines), 800 I 50 rpm
( 8 1 8 C 5 e n g i n e ) ?
Intermittent failur6, svstsm is OK
at this tim€.
l s i t 5 5 0 r p m ( 8 1 8 8 1 , 8 1 8 C 1
engines), 600 rpm {818C5
e n g i n e l o r l e s s ?
- 9 8
(To page 11'99)
(To page 11-99)
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Troubleshooting
