Ldle Air Control (Lag) Valve - Acura Integra 1998 Service Manual

ldle Control System
Problem verification:
'1. Do the ECM Feset Procedure.
2. Sta rt the engine.
ldle Air Control (lAG) Valve
The scan tool indicates Diagnostic Trouble Code (DTC) P1508: A problem in the ldle Air Control (lAC) valve
c r r c u r t .
The IAC Valve changes the amount of air bypassing the throttle body in response to a current signal from the Eclvl in
o r d e r t o m a i n t a i n t h e p r o p e r i d l e s p e e d . FTom AIB
To INTAKE
CLEANER MANIFOLD
IAC VALVE CONNECTOR IC116}
YES
WIRE SIDE OF FEMALE TERMINALS
ECM CONNECTOR A {32PI
Check for an open or short in the
wire IIACV line):
1 . T u r n t h e a g n i t i o n s w i t c h O F F
and reconnect the IAC valve
2. Disconnect the ECM connec
tor A (32P).
3. Turn the ignition swatch ON (ll).
4 . M e a s u r e v o l t a g e b e t w e e n
b o d y g r o u n d a n d E C M c o n
nector terminal A12.
IACV {8LK/BLU}
tacv
{BLK/BI-UI
The MIL has been reoorted on.
OTC Pl508 is stored.
lntermittent failure, svstem is OK
at this time. Check for ooor con-
nections or loose wires at C116
{lAC valvel and ECM.
ls DTC P1508 indicated?
Check tor an open in lhe wire
llGPl line):
1. Turn the ignition switch OFF.
2. Disconnect the IAC valve con
3. Turn the ignition switch ON (ll).
4. Measure voltage betlveen body
ground and the IACV connector
t e r m i n a l N o . 2 .
Repair open in the wire between
IAC valve and PGM-FI main relav-
ls there battery voltage?
Repair open or shon in the wi.e
between ECM {A12l and lAc valve.
ls there battery voltage?
Check the IAC velve function:
Momentarily connect ECM con-
n e c t o r t e r m i n a l s A 1 2 a n d A 1 0
with a jumper wire several times.
D o e s t h e I A C v a l v e c l i c k ?
Substitute a known-good ECM
and rocheck. lf symptom/indica-
tion goes away. replace the origi-
nal ECM.
' , ' * ' , , ' L l u . 9 ' , I l 1
1 2
1 5 1 6 1 7 1 a 1 o 2 0 /
l--12u1 z"-if1za-2"' . '1 .
9 1 0
t-r '
21
W i r e s i d e o f f e m a l e t e r m i n a l s
JUMPER WIRE
1 - 1 0 0