Honda Prelude 1993 Service Manual page 337

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When the idle speed is out of specification and the Malfunction Indicator Lamp (MlL) does not blink Diagnostic Trou-

ble Code lDTC) 14, check the following items:

. Adjust the idte speed (page I 1- l 1 I

. Air conditioning signal (page 11-99)

. A L T F R s i g n a t { p a g e 1 1 - 1 0 0 )

. A/T gear position signat {page 11-1O21

. Starter switch signal (p8ge 1j-1O41

. Brake switch signal (page 11-106)

. PSP switch signat (page t 1-108)

. Fast idle thermo valve (page l.l_109)

. Starting air valve

. Hoses and connections

. IAC valve and its mounting O-fings

It the above items are normal, substitute a known-good IAC valve and readiust the idle speed

{page 11-l1l).

. lf the idle speed still cannot be adjusted to specification (and the MtL does not blink

code 14) sfter IAC valve

replacement, substitute a known-good ECM and recheck. ll symptom goes away, replsce the original ECM.

Troubleshooting