Troubleshooting Flowchart - Idle Air Control (Iac) Valve - Honda Prelude 1993 Service Manual

ldle Control System
Troubleshooting Flowchart - ldle Air Gontrol (lAC) Valve
-r---i
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The Maltunction Indicator Lamp (MlL) indicates Diagnostic Trouble Code (DTC) 14: A problem in
-tgll
- -
I lr l_
the ldte Air controt {tAc) vatve circuit.
The IAC Valve changes the amount of air bypassing the throttle body in response to a current signal from the ECM in
order to maintain the proper idle speed.
TO INTAKE FROM AIR
MANIFOLD CLEANER
SPRING
1 1 - 9 6
VALVE
--t6t- :Frl
-
l-
---r--
- Tho MIL has boen r6portod on.
- With sgrvico check connoctor
jumped ls€o pago 1 1421, codo
l4 is indicatod.
Do the ECM Reset Procedure (see
p a g e 1 1 - 4 3 1 .
With lhe engine running and the
accelerator pedal released, dis-
connect the 2P connector lrom
the IAC valve.
ls the MIL on and does it indi-
cale code 14?
Intormitlant lafl uro, ay8-
tom is OK dt this timo
{to3t d.iving may bo
nocassa,yl.
Chock tor ooor connoc-
tion or looso wiros at
c+25, C433 (locarod at
right ahock towoil.
C106 llAC valvo) and
ECM.
Remove the 2P connector ttom
the IAC valve.
ls there a reduction
in engine rpm?
Substhute a known-good IAC
valve and retost.
( T o p a g e 1 1 9 7 )