Honda Prelude 1993 Service Manual page 310

l F r o m p s g e 1 1 - 6 4 )
Sub3tituto a known-good ECM
and rochock. lf 3ymptom/indica-
tion 9003 away, .eplaco tho origi-
nal ECM.
o o o o o o o o o o o o o
I o o o o o o o o
o v o o o o o o o o o o o
I o o o o o o o o
(cont'd)
Measure voltage between RED/
WHT (+) terminal and body
ground.
Measure voltage between RED/
WHT (+ ) terminal and BLUMHT
{ - ) terminal.
ls there approx. 5 V?
Ropai. op6n in BLU/
WHT wiro betwoon
ECM {D21} and MAP
s6n8l't.
Turn the ignirion swirch OFF.
ls there approx. 5 V?
Connect the test harness "D"
connecto.to the ECM only, notto
the main wire harness (see page
1 1 4 5 ) .
Turn the ignition switch ON.
Measure vollage between D19
l + )
t e r m i n a l a n d D 2 1 ( - )
terminal.
Measure voltage betweon WHT/
BLU {+ ) terminal and ELUMHT
{ - ) terminal.
ls there approx. 5 V?
Ropair opon in RED/WHT wiro bo-
twcon ECM (D191 and MAP
son3()r.
ls there approx. 5 V?
Turn the ignition switch OFF.
Reconnect the 3P connector to
the MAP sensor.
Connect the test harness between
the EC|VI and connector lsee page
1 1 - 4 5 ) .
Turn the ignition switch ON.
ft
D 1 9 t r l D 2 1 ( _ l
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