Fiat STILO 1.9 JTD 16v da 07/03 a 12/03 – COMPRESSOR ENGAGEMENT – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

COMPRESSOR ENGAGEMENT - WIRING DIAGRAM Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Components - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Component code	Name	Assembly reference
B1	Engine compartment junction unit
B99	Maxifuse box on battery
H80	Climate control controls
H81	Climate control fan control
K86	Frost sensor	-
L20	Air conditioning compressor "on" electromagnet
M10	Engine management ECU
M10	Engine management control unit	-
M10	Engine management control unit
M70	Climate control system control unit
O30	Air fan adjustment resistance	-
O30	Passenger compartment air fan adjustment resistor	-

Location of components - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

COMPRESSOR ENGAGEMENT - LOCATION OF COMPONENTS Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

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Components - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Component code	Name	Assembly reference
B1	Engine compartment junction unit
B99	Maxifuse box on battery
H80	Climate control controls
H81	Climate control fan control
K86	Frost sensor	-
L20	Air conditioning compressor "on" electromagnet
M10	Engine management ECU
M10	Engine management control unit	-
M10	Engine management control unit
M70	Climate control system control unit
O30	Air fan adjustment resistance	-
O30	Passenger compartment air fan adjustment resistor	-

Description - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

The centre button in the climate control control panel in the centre of the dashboard switches on the air cooling and dehumidifying circuit, activating the air conditioning compressor.The above button enables the operation of the air cooling circuit; but the actual switching on of the compressor also depends on the intervention of:the fan linear sensor, located in the refrigerant circuit, which stops the air conditioning being switched on if the pressure of the fluid is too low or too high;the engine control unit which, according to the engine management logic, excludes the operation of the compressor, for example in the case of high engine temperatures or in the case of high engine loads (sharp acceleration).

Description - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

The appropriate button in the climate control control panel enables operation of the air cooling circuit; when the button is pressed the LED comes on.The above button enables the operation of the air cooling circuit; the actual switching on of the compressor, however, also depends on the climate control system ECU operating strategy.The compressor can also be switched off by the intervention of the fan linear sensor or the engine management control unit.

Description - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

For more details.With the compressor switched on, the fan is operated at the first speed by means of a special relay located inside the unit.The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.The supply for the controls comes via a line controlled by the ignition and protected by a fuse in the underdashboard control unit.

Functional description - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Relay T5 of engine bay control unit B1 controls the compressor activation circuitThe relay power supply passes through the line of dedicated fuse F19 of engine bay junction unit B1The power supply to the coil of relay T5 arrives from main injection relay T9 and the line protected by fuse F18, both located in engine compartment junction unit B1 .

Functional description - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

The climate control unit M70 sends an enablement signal for the engagement of the compressor to the engine management control unit M10, pin 54 of connector

Functional description - COMPRESSOR ENGAGEMENT - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Pressing the button in group H80, sends two signals:a signal to the engine management control unit M10, pin 54 of connector A.the second signal energizes the relay J34 coil which activates the first speed for the fan N85, according to the description See E6020 AIR CONDITIONING .Fan N85- supplied by ignition-operated line (INT/A) of relay T8 and dedicated fuse F8 of engine bay control unit B1 - is operated at the first speed in any case if the compressor activation request button is operated, even if control knob H81 is in position ''0''.According to its internal control logic, the control unit M10 sends the command - from pin 29 of connector A - to engage the compressor which energizes the relay T5. The activation electromagnet of air conditioner compressor in L20 is therefore controlled at a voltage of 12VIf the linear sensor for fans K120 indicates that the pressure level is too high or too low to control unit M10 - pin 13 of connector A, control unit M10 cuts out compressor activation.