Honda Acura NSX 1991 Service Manual page 246

The EACV changes the amount of air bypassing the throttle body in response to a current signal from the ECU in order to maintain the
proper idle speed.
reported on.
jumped (page 1 I-18). CODE
14 is indicated.
Start the engine.
I
Is Check Engine light on and
does it indicate CODE 147
Connect the ECU test harness
"A" connector to the engine
wire harness only. not the ECU
(page 1 l-21).
Turn the ignition switch ON.
(To page 1 l-71)
TO INTAKE FROM AIR
M A N I F O L D C L E A N E R
VALVE SHAFT
Intermittent failure,
system Is OK at this
time (test driving may
be necessary).
Check for poor con-
nection or loose wires
a t E A C V C133 a n d
ECU.
VALVE