Alfa Romeo GT 2.0 JTS – COMPRESSOR ENGAGEMENT – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 2.0 JTS

COMPRESSOR ENGAGEMENT - WIRING DIAGRAM Alfa Romeo GT 2.0 JTS

Components - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 2.0 JTS

Component code	Description	Reference to the assembly
B1	JUNCTION UNIT
B1	JUNCTION UNIT
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
D4	FRONT/ENGINE CONNECTION ( CONNECTORS )	-
D8	FRONT/AIR CONDITIONING - HEATER COUPLING	-
H1	IGNITION SWITCH
K10	4 STAGE PRESSURE SWITCH ( FRONT )
L20	AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET ( CONNECTORS )
M10	ENGINE MANAGEMENT ECU	1056B
M10	ENGINE MANAGEMENT ECU
M70	CLIMATE CONTROL SYSTEM CONTROL UNIT

Component location - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 2.0 JTS

COMPRESSOR ENGAGEMENT - COMPONENT LOCATION Alfa Romeo GT 2.0 JTS

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Components - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 2.0 JTS

Component code	Description	Reference to the assembly
B1	JUNCTION UNIT
B1	JUNCTION UNIT
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
D4	FRONT/ENGINE CONNECTION ( CONNECTORS )	-
D8	FRONT/AIR CONDITIONING - HEATER COUPLING	-
H1	IGNITION SWITCH
K10	4 STAGE PRESSURE SWITCH ( FRONT )
L20	AIR CONDITIONING COMPRESSOR ENGAGEMENT ELECTRO-MAGNET ( CONNECTORS )
M10	ENGINE MANAGEMENT ECU	1056B
M10	ENGINE MANAGEMENT ECU
M70	CLIMATE CONTROL SYSTEM CONTROL UNIT

Description - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 2.0 JTS

When conditions require, the climate control system control unit switches on the air cooling and dehumidification circuit, activating the air conditioning compressor.The special button in the climate control system control panel enables the operation of the air refrigeration circuit; the LED comes on when the button is pressed.The above button enables operation of the air cooling circuit, but actual compressor activation is dependent upon the climate control system control unit logic: for more details.The compressor can also be switched off through the intervention of the 4 stage pressure switch or by the engine management control unit.The compressor is controlled by means of a special relay located in the engine compartment junction unit; the supply line is protected by a special fuse, also located inside the engine compartment junction unit.

Operational description - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 2.0 JTS

The relay T5 in the engine compartment junction unit B1controls the compressor engagement circuit.The supply for the relay arrives via the line for the CVM maxifuse located on the battery, connector B99, via the line for the specific fuse F19 in the engine compartment junction unit B1..The climate control system control unit M70sends - from pin 36 - the enablement signal for engaging the compressor, to the 4 stage pressure switch K10: if the pressures in the coolant circuit are correct, the signal leaves the pressure switch and reaches the engine management control unit M10, pin 40 of connector A. On the basis of its internal control logic, the control unit M10sends the command - from pin 7 of connector A - to engage the compressor which energizes the relay T5 so that the air conditioning compressor engagement solenoid L20 is operated at a voltage of 12 V .