Air Conditioning Signal - Honda Prelude 1993 Service Manual

ldle Control System
Troubleshooting Flowchart -
Air Conditioning Signal
This signals the ECM when there is a demand for cooling from the ai. conditioning system.
1 1 - 9 8
Connect the test hatness between
the ECM and connectors.
Disconnect "B" connector from
the main wire harness only, not
the ECM (see page 11-45)
Turn lhe ignition switch ON.
Measure voltage between 85 (+)
terminal and A26 (-) terminal.
Substituto a known-
good ECM and ]e fieck.
It prssc bod voltago i3
now availablo, rapl6c6
th6 origln.l ECM.
ls there approx. 5 V?
Reconnect "8" connector to the
main wirc harness.
Momentarily connect A15 ter-
minal to /q26 t€rminal several
times.
Connecr rho RED/BLU torminrl ot
ihe 4P conneclor on tho A,/C
clutch rolty to body g.ound.
ls thsre a clicking nob€ ftom the
A/C comprc$or clulch?
S6a alr condltlonat in-
rpaetlon lrac toction
22t.
13 thorc I clicking noiae trom the
A/C comore6sor clutch ?
Ropair open in RED/BLU wlr6 bo-
rwo.n ECM {A 15} rrd A/C drnc*l
relay.
A26 t-t
Clicklng?
Vigw from wire harness side
{ T o p a g e 1 1 - 9 9 }