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

Wiring diagram - ENGINE COOLING - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

ENGINE COOLING - WIRING DIAGRAM Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Components - ENGINE COOLING - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Component code	Name	Assembly reference
B1	Engine compartment junction unit
C1	Battery earth	-
D4	Front/engine connection	-
D4	Front/engine coupling	-
H1	Ignition switch
M10	Engine management ECU
M10	Engine management control unit	-
M10	Engine management control unit
M150	Engine fan control unit	-
M150	Engine fan control unit
N11	Engine electric fan motor	-
N11	Engine electric fan motor
O10	Engine fan adjustment resistor	-

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

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

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Components - ENGINE COOLING - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

Component code	Name	Assembly reference
B1	Engine compartment junction unit
C1	Battery earth	-
D4	Front/engine connection	-
D4	Front/engine coupling	-
H1	Ignition switch
M10	Engine management ECU
M10	Engine management control unit	-
M10	Engine management control unit
M150	Engine fan control unit	-
M150	Engine fan control unit
N11	Engine electric fan motor	-
N11	Engine electric fan motor
O10	Engine fan adjustment resistor	-

Description - ENGINE COOLING - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

The engine radiator and air conditioner condenser cooling system consists of one fan operated at two different speeds:the first speed is activated by the engine management control unit at a first temperature level of the engine coolant or at a certain air conditioner coolant pressure;The second speed cuts in at a higher temperature or pressure threshold.The fan is operated by two specific relays located in the engine compartment unit.The fan supply line is protected by two specific fuses, located in the engine compartment unit.The fan can only be switched on when the ignition is ON.

Functional description - ENGINE COOLING - Fiat STILO 1.9 JTD 16v da 07/03 a 12/03

The relays T6 and T7 in the engine compartment unit B1 manage the switching on of the fan N11 at two speeds: their coils are supplied by the ignition-controlled line (15/54), while the power lines are protected by the fuses F6 and F7, of the engine compartment unit B1 .Both are energized by a control signal - earth - coming from the engine control unit M10 .If the engine coolant reaches a first temperature level, or the fan linear sensor K120 indicates to the control unit M10 - pin 13 of connector A - that a first pressure level has been reached, the control unit M10 sends a signal - from pin 90 of connector A - to the fan 1st speed relay T6, which then sends the supply to the fan N11 via the additional resistor O10: the fan thus turns at the first speed (slow).If the coolant reaches a higher temperature level, or indicates to the control unit M10 that a higher pressure has been reached, the control unit M10 sends a signal - from pin 69 of connector A - to the fan 2nd speed relay T7, which sends the supply directly to the fan N11: the fan then turns at the maximum speed.Linear sensor K120 receives a power supply and reference earth from the engine management control unit M10, pins 12 and 22 of connector A.