Honda Prelude 1993 Service Manual page 397

{From page 1 1-156}
{From page
Turn the ignition switch OFF.
Reconnoct the 3P connector to
the EGR valve lift sensor.
Connect the test h€mess belween
the ECM and connectors (see
p a g e 1 1 - 4 5 ) .
Turn the ignition switch ON.
Measure voltage between O'l2
f + )
t e r m i n a f a n d D 2 2 l - )
terminal.
ls the voltage approx. 1.2 V
with no vacuum applied and
approx. 4.3 V with 2OO mm
Hg {8 in Hg) of vacuum ap-
plied to the EGR valve?
Ropair opon or lhort in WHT/
BLK wir. botwo.n EGR valvo
lift !.n.or and ECM {D12}.
ll YYi.o b OK, r.Dlac. th. EGR
(To page 1 1-158)
' t 1 - 1 5 6 )
Ropair open in GRN/
WHT wii. botweon
EGR vrlv6 lift sonsor
ond ECM (D22).
Connect the test harness "D"
connectorto the ECM only. not to
th6 main wire harness (see pags
1 1 - 4 5 ) .
Turn the ignition switch ON.
Measure voltage botween D19
( + ) t e r m i n a f a n d O 2 2 l - l
terminal.
Rgpair opon in RED/
WHT wir.
batwoon
EGR valv. litt !.n3or
.nd ECM (Dl91.
Subrtituto a known{ood
ECM
and .ech6ck, lf symptom/lndic€-
tion go6i away, ,ophc6 rha origi-
nal ECM.
D 1 2 t + t D 2 2 t - l
t l
1.2 V wirh no vacuum appli.d?
4.3 V rvith 2OO mm Hg (8 in.Hol
of vacuum appliod?
(cont'd)
11-157