FUEL SYSTEM <DOHC>
On-Vehicle Inspection of
Components
AIR CONDITIONING SWITCH AND A/C COMPRESSOR CLUTCH RELAY
Air conditioning switch
,
--
Sub fusible link
2 Dual pressure
switch
Air conditioning
temperature
s w i t c h
2
TSB
Revision
Engine control module
Engine control module connector
OPERATION
l
The air conditioning switch applies battery vol-
tage to the engine control module when the
air
conditioning is switched ON.
T R O U B L E S H O O T I N G H I N T S
If the air conditioning compressor’s magnetic clutch
is not activated when the air conditioning switch
is switched ON during idling, it is probable that the
.
When the air conditioning signals are input, the
engine control module activates the idle air
motor, and also switches ON the power
transistor. As a result, current flows to the
compressor clutch relay coil and the relay
switch is switched ON, the air conditioning
compressor’s magnetic clutch is activated.
cause is a malfunction of the air conditioning control
system.
Summary of Contents for 1989 Galant
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