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Wiring diagram - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.8 T.SPARK
Components - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.8 T.SPARK
| Component code | Description | Reference to the assembly |
| B1 | Engine compartment junction unit | 5505A |
| B99 | Maxifuse box on battery | 5530B |
| D4 | Front/engine coupling | - |
| D8 | Air conditioning-heater front coupling | - |
| H1 | Ignition switch | 5520A |
| K10 | 4 stage pressure switch | 5040B |
| L20 | Air conditioning compressor engagement electro-magnet | 5040A |
| M10 | Engine management control unit | 1056B |
| M70 | Climate control sytem control unit | 5040D |
Component location - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.8 T.SPARK
Components - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.8 T.SPARK
| Component code | Description | Reference to the assembly |
| B1 | Engine compartment junction unit | 5505A |
| B99 | Maxifuse box on battery | 5530B |
| D4 | Front/engine coupling | - |
| D8 | Air conditioning-heater front coupling | - |
| H1 | Ignition switch | 5520A |
| K10 | 4 stage pressure switch | 5040B |
| L20 | Air conditioning compressor engagement electro-magnet | 5040A |
| M10 | Engine management control unit | 1056B |
| M70 | Climate control sytem control unit | 5040D |
Description - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.8 T.SPARK
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 detailsThe compressor can also be switched off through the intervention of the 4 stage pressure switch or by the engine management control unitThe 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 located inside the engine compartment junction unit
Functional description - COMPRESSOR ENGAGEMENT - Alfa Romeo GT 1.8 T.SPARK
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 See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT.The power supply for the coil for relay T5 arrives from the main injection relay T9 and from the ignition-operated line (15/54) protected by fuse F16, both located in the engine compartment junction unit.The climate control system control unit M70The climate control system control unit M70 sends 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 leavs the pressure switch and reaches the engine management control unit M10, pin 6 of connector A. On the basis of its internal control logic, control unit M10 sends the command - from pin 13 of connector A - to effectively 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.sends 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 6 of connector A. On the basis of its internal control logic, the control unit M10sends the command - from pin 31 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 .