Honda Prelude 1993 Service Manual page 317

( F r o m p a g e 1 1 - 7 2 )
Turn the ignition switch ON.
Measure voltage between YEL/
BLU and body ground.
Measure voltage between YEL/
BLU (+ ) torminal and GRNA/VHT
(- ) terminal.
ls there approx. 5 V?
Repair op€n in GRN/
WHT wlra brtw.on
EGM (D22) and ECT
tonaoa.
Turn the ignition switch OFF.
ls there approx. 5 V?
Subrrituto r known{ood
ECM
and iocheck. lf lymptom/lndlcr-
tion goaa aw!y, rol aco tha origi-
nal ECM.
Disconnect the 22P connector
trom the TCM.
Turn the ignition switch ON.
ls there approx. 5 V?
Connect the test harness "D"
connector to the ECM only, notto
the main wire harnsss ls€e page
1 1 - 4 5 ) .
Turn the ignition switch ON.
Measure voltage belween D13
( + l
t e r m j n a l a n d D 2 2 ( - )
rermtnat.
Ropair open or rhon in YEL/BLU
wir. betwoon ECM lDl3l snd
ECT sensor.
ls there approx. 5 V?
GBN/
wHT
A/T only
Turn the ignition switch OFF.
Subatituto a known-good ECM
and rechock. lt symptom/indica-
tion goos away, r6pl6co the origi-
nal ECM.
YEL/BLU
YES
NO
I
I
I
D22 t-l
NO
T-5
v?
O 1 3 l + l
11 -7 3