Mitsubishi Eclipse Workshop Manual page 145

FUEL
-
On-vehicle lnspection
of
MPI Components
13-77
N
,$
rl:t/
't
1A
o
o
AIR
CONDITIONER SWITCH
AND
POWER
REIAY
OPERATION
o
The
air conditioner switch applies the battery voltage to the engine control unit when the air conditioner
is turned
on.
.
When the air conditioner ON signal is input, the engine control unit drives the idle speed control seno
and turns ON the power transistor. As
a
result,
the air
conditioner compressor power relay
coil
is
energized
to turn on the
relay switch,
which
activates
the air compressor magnet
clutch.
TROUBLESHOOTING HINTS
lf the air
compressor magnet
clutch is not
activated when
the air conditioner switch
is turned on during
idling, faulty air conditioner control system is suspected.
INSPECTION
Using Muhi-use Tester
(MUn
AIR CONDITIONER SW.rICH
o
o
o
o
o
o
Air
conditioner
l-usrble link
(30A)
controller
Air
conditioner
@
ffi
Dual pressure
switch
@@
Engine
control unit
control unit
conn€ctor
[]JHtrINJHLN
ffiffi
Air
conditioner
4{d
^lh\^\-
Air
conditioner >._,
Function
Item
No. Data display
Check condition
Air conditioner
srryitch
Normal
indication
Data reading
28
Switch state
Engine:
ldling (air
compressor
to
be
running when
air
conditioner sruitch
is
ON)
OFF OFF
ON ON
O marlubbhl Motoc Corpo?rtton
Apr.
t99t
Pnru89010