Honda S2000 Service Manual page 321

1 1. Connect IAC valve 3P connector terminals No. 1
and No. 3 with a iumoer wire.
IAC VALVE 3P CONNECTOR
tacv
(BLK/RED}
JUMPER WIRE
Wire side of female terminals
Check for continuity between ECM connector
terminal B23 and body ground.
ECM CONNECTOR B {25PI
(BLK/REO}
2 3
4
5
,/ ,/1,/
I t0
1 l
12
,/1,/1,/),/
2A
21
22
23
,/1,/
tAcv
n
Wire side of female terminats
ls there continuity?
YES Go to step 13.
NO Repair open in the wire between the IAC valve
a n d t h e E C M ( 8 2 3 ) . 1
't4.
1 5 .
13. Remove the jumper wire from the IAC valve 3P
connector, then reconnect the IAC valve 3P
connector.
Turn the ignition switch ON (ll).
Measure voltage between body ground and ECM
connector terminal 823.
ECM CONNECTOR B I25PI
I
2 3
4
5
,/1,/1,/
9 1 0
11
12
,/l//1,/
20 21 22
23
,/1,/
tAcv
Wire side ot female terminals
(8LK/REDI
ls there battery voltage?
YES-Substitute a known-good ECM and recheck
{see page 1 l-5). lf the symptom/indication
goes
away, replace the original ECM. t
NO Replace the IAC valve.I
11-93