Honda Prelude 1993 Service Manual page 321

(From pag€ 1 1-76)
Mgasure voltage betweon BED/
YEL (+ ) terminal and GRNMHT
{- ) terminal.
Ropair opcn in GRN/
WHT wlr6 botwoon
ECM (D221 and IAT
lon301.
li there approx. 5 V?
Subrtitut. . known-good ECM
and rochock. ll lymptom/indica-
tioh goe! aw!y, r6pl.ce th. orlgl-
nel ECM.
Ropair opon or lhort in REOrYEL
wire botween ECM {D15}.nd IAT
aona{tr.
ls ther6 approx. 5 V?
Substilute a known-good ECM
and .ochock. lI symptom/indica-
tion go6s awsy, roplac6 tha origi-
nal ECM,
Measure voltage between RED/
Y E L ( + ) t e r m i n a l a n d b o d y
ground.
Turn the ignition switch ON.
ls th6re approx. 5 V?
Turn the ignition switch OFF.
Turn the ignition switch ON.
Connect the test hamess "D"
connector to the EcM only, notto
the main wire harness lsee page
1 1 - 4 5 ) .
Measure voltage between Dl5
{ + } t e r m i n a f a n d D 2 2 l - )
terminal.
1 1- 77