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Idle Control System
Idle Air Control (lAC) Valve (cont'd)
'98
- 00
models:
-
The
Mil has been reported on.
-
Ole P1508 Is stored.
Probtem
verification:
1.
Do
the ECM/PCM
Reset
Pro-
cedure.
2.
Start
the
engine. and
warm
it
up to
normal
operating tem
-
perature.
Intermittent failur
••
system is OK
"'-
NO
at this time. Check for poor con-
Is
OTe
P1508
indicated?
./
nectlons or loos. wires at C132
YES
(lAC valvel and at the
ECM/PCM.
lAC VALVE 2P CONNeCTOR
IC132)
Check for
an
open in the wire
IIGP1 linal:
1.
Turn
the ignition
switch OFF.
2.
Disconnect the lAC valve
2P
connector.
3.
Turn
the ignition
switch
ON
(II
).
4.
Measure
vohage between body
ground and
the
lAC
valve 2P
connector
terminal No.2.
Wire side of female terminals
Rapair open in the wlr. between
"'-
NO
Is there
battery
voltage?
. /
the lAC valve and the PGM-FI
main relay.
YES
ECM/PCM CONNECTOR B I25P)
Check for an open or short in the
wire (lACV line):
1. Turn
the
ignition switch
OFF
1
2
3 4 5
/
/
81
and reconnect
the
lAC
valve
• ,
.
11
/
13
L
V
V
17
VI
2P
connector.
2.
Disconnect
ECM/
PCM con·
nector
8
(25P).
3. Turn the ignition
switch
ON
(II).
4.
Measure
voltage
between
body ground
and
ECM/PCM
1.
20
~",r
IBlK/BLU) '{
connector
terminal
823.
Wire side
of
fema
le
terminals
Repair open or short In the wire
"'-
NO
Is there banery voltage?
./
betw . . n tho ECM/PCM (823) and
the lAC valve.
PGl
YES
fBlK)
1
2
3 • 5
/
/
81
Check the
lAC
valva function:
Momentarily
connect
ECM/PCM
co
nnector terminal
s
823 and 82
•
,
.
11
/
13
/ / /
17
VI
1.
2.
E.~
23
/
/
with a
jumper
wire
several
times.
IACV
IBlKI
BlU)
"'-
NO
J
Does
the lAC
valve
click?
Replec. the lAC valv •.
JUMPERWlRE
YES
Substitute a known·good ECM!
PCM and rachel:k. If
symptom!
indication gael away, replan
the original ECM!PCM
.
11-154
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Troubleshooting
