Honda Prelude 1993 Service Manual page 369

Turn the ignition switch OFF.
Connect the test harness betwgen
the ECM and connectors.
Disconnoct "A" connector from
the ECM onlv, not the main wire
harness (see page 11-451.
Check tor continuity between
GRN/BLK terminal @ and rhe
following terminals; A7. A8.
R6palr open in GRN/BLK wlr. b€-
twoon ECM lA7, A8l and PGM-FI
main rohy.
Turn the ignition swirch ON.
Measure the voltage between
423 1-) terminal and the tollow-
ing terminals: A25 (+) 81 lf).
R.pair opon in tho YEL/BLK O
rvi 6 botwoon th. ECM (A25,
811 lnd PGM-FI h.in iohy.
R.pl.c. PGM-FI main r6lay.
ls there battery vokage?
Turn lhe ignilion switch OFF.
Connect a voltmeter between A7
l+l te.minal and A23 l-) rer
mtnat.
Subrtltulc 6 known-good ECM
and raatrock. ll p.eacriH
voltago
b now svail.Hg, rgf aco tho origi-
nal ECM.
ls there batt€ry voltage tor lwo
seconds when the ignition
switch is first tu.ned on?
Chock th. PGM-FI mlin r.l6y (.eo
p a g . l 1 - 1 2 6 ) .
11.12Al
1 - 1 29
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