Honda Prelude 1993 Service Manual page 395

{From page 1 1-154}
With the engine at idle, apply 2O0
mm Hg (8 in Hglof vacuum to the
EGR valve.
Ooes the engine stall or run
rough and does the EGR
valve hold vacuum?
Disconnect the 2P connector from
the EGR control solenoid valve.
Measure voltage between BLK/
YEL (+lterminalon the main wire
harness and body ground.
Repair opon in BLKrYEL wir6 bo-
tween th6 EGR contrcl iolenoid
v6lv. .nd ECU (ECM) (15 Al fuso
(in tho und6r{a.h turo/,olay borl.
ls there battery voltage?
Reconnect the vacuum pump/
gauge to the # |6 hose.
( T o p a g e 1 1 - 1 5 6 )
Check vacuum hoso
rouling of the ontiro
EGR system. It hoss
routing ir OK, roplac.
EGR control 3olenoid
ls there any vacuum?
Turn the ignition switch OFF and
disconnect the "A"
conngctor
from the ECM.
Check tor continuity to ground on
RED wire of the 2P connector.
Ropair sho.t in RED wir6
botween EGR control
solonoid valvo ard ECM
{ A 1 1 t .
Substitut. a known€ood ECM
and rot$t. It symptom/indication
goos away, roploco tho odginol
ECM.
(From page t 1-154)
EGR
CONTROL
SOLENOID
VALVE
{cont'd)
1 1 - 1 5 5