Acura Integra 1998 Service Manual page 302

2 .
1 .
1 .
2 .
After the engine stans, the IAC valve opens for a certain time. The amount ol air is increased to raise the idle speed
about 150 - 300 rpm.
When the coolant temperature is low, the IAC valve is opened to obtain the proper fast idle speed. The amount of
bypassed air is thus controlled in relation to the engine coolant temperature.
IDLE SPEED
trpm,
ENGINE
COOLANT TEMPERATURE
140
50
1 0 4
40
-1
32
-20
0
176 ('F)
80 fcl
When the idle speed is out of specification and the scan tool does not indicate Diagnostic Trouble Code (DTC) P0505
or P'1508, check the following items:
. A d i u s t t h e i d l e s p e e d ( s e e p a g e ' 1 1 - 1 1 1 )
'
A L T F R s i g n a l ( s e e p a g e 1 1 - 1 0 1 )
. A i r c o n d i t i o n i n g s i g n a l { s e e p a g e ' 1 1 - 1 0 2 )
'
B r a k e s w i t c h s i g n a l ( s e e p a g e l l - 1 0 4 )
. S t a r t e r s w i t c h s i g n a l ( s e e p a g e 1 1 - 1 0 5 1
. A,4 gear position signal (see page 1l 106) (A"/T)
.
PSP switch signal (see page 11-108) (USA)
.
F a s t i d l e t h e r m o v a l v e ( s e e p a g e 1 1 - 1 1 0 )
.
Hoses and connections
.
IAC valve and its mounting O rings
ll the above items are normal, substitute a known-good IAC valve and readjust the idle speed (see page
'l
I -1 1 l).
lf the idle speed still cannot be adjusted to specification (and the scan tool does not indicate DTC P0505 or P1508) after
IAC valve replacement, substitute a known-good ECM and recheck. lf symptom goes away, replace the original ECM.
11-97