Honda Prelude 1993 Service Manual page 301

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I o o o o o o o o o o o o o I o o o o o o o o f , S & l * * * * N o o o o o o o o o o o |
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Continuitv?
(cont'd)
1 1 - 5 2 )
ls th€re continuityT
Turn th€ ignirion switch ON.
Reconnect all the sensor con-
nectors.
Reconnect the "D" connector to
the ECM.
NO
Disconnect "A"
con,
nector lrom the EcM.
Substituto . known{ood
ECM
and rochock. lt lymptom/indica-
tion gooa awsy, roplaca the origi-
n8l ECM.
ls the MIL ON?
R€prir rhort to body
ground in BLU/WHT
wlro betwoon tho ECM
{A131 rnd th6 MlL.
Insp6ct the ECU (ECM) (15 A)
Iuse an the underdash tuse/relay
box.
Turn the ignition switch ON.
Disconn6ct the 3P connector of
each sengor one at a time:
. MAP sensor
. EGR valve litt s€nsor
. Throttle Position (TP) sensor
RoDlaca tho aenaor that causod
thc light to 9o our.
Does the MIL romain ON?
Turn the ignition switch OFF.
Connect the test harness.
Oisconnoct the "O" connector
Irom the ECM onlv, not the m6in
wire hamess (see page | 1-451.
Check tor continuity between
body ground terminals D'l9, D2O.
- Bopair .hort to body ground in
RED/WHT wiro bctwe.n ECM
{Dl9} ond MAP 3onso. or EGR
valve lift sonror.
- Bopair shon to body g.ound in
YEL/WHT wlre botw66n ECM
lD2Ol and TP !on3or.
(To page 1 1-54)
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