Honda Prelude 1993 Service Manual page 311

PGM-FI System
Troubleshooting Flowchart -
{From psge 11-65)
Manifold Absolute Pressure (MAPI Sensor lcont'dl
(From page 1 1-65)
MeasuG voltage bstween D'l7
( + l t e r m i n a l a n d D 2 1 ( - )
terminal.
ls there approx. 3 V?
Sub.tituls . known{ood
ECM
rnd r.chock. lf 3ymptom/lndica-
tion goo! 6w!y, r.plact th. odgi
nal ECM.
Turn the ignition switch OFF.
Connect the test harn€ss
"D"
connector to the ECM only, not to
the main wire harness {see page
1 1 - 4 5 ) .
Turn the ignition switch ON.
Measure voltage betweon D17
( + l
t e r m i n a l a n d D 2 1 { - )
tetmlnal.
- Roplir rhort In WHT/BLU wiro
botworn ECf,l {D17) rnd MAP
loflto],
- R.prir opon in WHT/BLU wlrc
botwo.n ECM (Dl7l.nd MAP
36nao..
ls there approx. 5 V7
Substltuto a known{ood ECM
and rochock. lf aymptorn/indicr-
tion goo3 away, taplace tho origi-
nal ECM.
1 1 - 6 6