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Wiring diagram - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.9 JTD 16V
Components - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.9 JTD 16V
| 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 1.9 JTD 16V
Components - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.9 JTD 16V
| 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 1.9 JTD 16V
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 1.9 JTD 16V
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 B99Climate control system ECUM70 sends an enablement signal from pin 36 for compressor activation to 4-stage pressure switch K10: if pressures in the coolant circuit are correct, the signal emerges from the pressure switch and reaches engine control ECU M10, pin 54 of connector A. According to its inner control strategy, control unit M10 sends a compressor activation command from pin 29 of connector A which excites relay T5 so that the electromagnet for activation of air conditioner compressor L20 is controlled at 12 V. .The power supply for the coil for relay T5 arrives from the main injection relay T9 and from the line protected by fuse F18, both located 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 54 of connector A. On the basis of its internal control logic, the control unit M10sends the command - from pin 29 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 .
