Honda Prelude 1993 Service Manual page 306

PGM-FI System
I
iM-Fl System
Troubleshooting Flowchart - Heated Oxygen Sensor (HO2S) Heater {cont'd)
(From psge 11-59)
1 1 - 6 0
Reconnect the 4P connector to
the Ho2s.
Connect the test hahess
"A"
connector to the main wi.e haF
ness onlv, not the ECM (s.e page
1 1 - 4 5 ) .
Turn th6 ignition switch ON.
Measure voltage between A6 {+}
terminsl and A23 {- } terrninal.
Rep.lr op€n in OR /WHl wir. bc-
twcrn ECM lA6) .nd HO2S.
ls there battery voltage?
Subllltuto 6 known-good ECM
and$chock.
ll symptomlindica-
t'roril'golr ay{ay, rsplaco tho otigil_
nal ECM.
o o o o o o o o o o o
o o o o o o o o o o o
o o o o o o o o
o o o o o o o o
o o o o o o o o o o o o o
o o o o o o o o o o o o o
Connoct the tesl harness
"A"
connector to the main wile haF
ness only. not the ECM (see page
1 1 - 4 5 ) .
Connect an ammetet b€tween tel-
minals A6 { + ) and A26 (- )
ls the curront less than
0 . 1 A ? '
Subrtltut. a knownSood ECM
lnd rochock. ll .ymptom/indica-
tion 9o6a away, roplaco tha origi_
nal ECM,
' Monitor over a 5 minutes period.
BATTERY
VOLT
F