Mitsubishi 3000GT Service Manual page 227

AIR CONDITIONING SWITCH AND COMPRESSOR CLUTCH RELAY
OPERATION
The air conditioning switch applies the battery voltage to the engine control module when the air
l
conditioning is turned on.
When the air conditioning ON signal is input, the engine control module drives the idle air control
l
motor and turns ON the power transistor. As a result, the air conditioning power relay coil is energized
to turn on the relay switch, which activates the air compressor magnetic clutch.
TROUBLESHOOTING HINTS
If the air compressor magnet clutch is not activated when the air conditioning switch is turned on during
idling, faulty air conditioning control system is suspected.
INSPECTION
Using Scan Tool
AIR CONDIT' )NING S'
Item No.
2 8
MULTIPORT
On-Vehicle Inspection of MFI
FUEL INJECTION - Comtaonents
Air conditioning
control unit
Engine control module
Engine control module connector
'ITCH
Data display Check
Switch state Engine: Idling (air corn-
when air conditioning ON
switch is ON)
Air conditioning
compressor lock
controller
Air conditioning switch
condition
OFF
I
Normal indication
OFF
ON