Fiat DOBLO 1.9 DIESEL da 12/03 – ENGINE COOLING – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram - ENGINE COOLING - Fiat DOBLO 1.9 DIESEL da 12/03

ENGINE COOLING - WIRING DIAGRAM Fiat DOBLO 1.9 DIESEL da 12/03

COMPONENTS - ENGINE COOLING - Fiat DOBLO 1.9 DIESEL da 12/03

Component code	Name	Assembly reference
A1	Battery
A1	Battery
B1	Engine compartment junction unit	-
B1	Engine compartment junction unit
B2	Junction unit under dashboard
D28	Engine cables/radiator cable coupling	-
D28	Engine cables/radiator cable coupling
K30	Insufficient engine oil pressure (switch) sensor
K45	Engine temperature sensor for i.e.
M10	Engine management ECU
N11	Engine electric fan motor
N11	Engine electric fan motor
N12	Engine electric fan motor
N12	Engine fan motor -2
O10	Engine fan adjustment resistor

Location of components - ENGINE COOLING - Fiat DOBLO 1.9 DIESEL da 12/03

ENGINE COOLING - LOCATION OF COMPONENTS Fiat DOBLO 1.9 DIESEL da 12/03

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COMPONENTS - ENGINE COOLING - Fiat DOBLO 1.9 DIESEL da 12/03

Component code	Name	Assembly reference
A1	Battery
A1	Battery
B1	Engine compartment junction unit	-
B1	Engine compartment junction unit
B2	Junction unit under dashboard
D28	Engine cables/radiator cable coupling	-
D28	Engine cables/radiator cable coupling
K30	Insufficient engine oil pressure (switch) sensor
K45	Engine temperature sensor for i.e.
M10	Engine management ECU
N11	Engine electric fan motor
N11	Engine electric fan motor
N12	Engine electric fan motor
N12	Engine fan motor -2
O10	Engine fan adjustment resistor

Description - ENGINE COOLING - Fiat DOBLO 1.9 DIESEL da 12/03

The engine radiator and condenser cooling system consists of a fan, which, on some versions, operates at two different speeds:the first speed is activated at a first coolant temperature level or at a certain air conditioner coolant pressure.the second speed cuts in at a higher temperature threshold.The operation of the fan is achieved by means of two special relays located in the junction unit.The fan supply line and the relay energizing circuit are protected by a special fuse located in the above mentioned junction unit which protects numerous other services controlled by the ignition.The fans therefore only come on when the ignition is switched ON.

Functional description - ENGINE COOLING - Fiat DOBLO 1.9 DIESEL da 12/03

The supply for the fan N11 arrives directly from the battery via relays R6 and R7 housed in the engine compartment junction unit B01 from the line entering pin 1 connector A of the actual junction unit.The supply for the relays is protected by fuse F7 for relay R7 and fuse F6 for relay R6 .They are energized by two distinct earth signals coming from the engine management control unit M10.The engine temperature sensor K45 measures the temperature of the engine coolant and, if the values for this parameter are high, the control unit M10 sends an earth signal from pin 53 to the relay which energizes the coil. The relay R6 then sends the supply, through the resistance O10 , operating the fan N11 at the first speed (slow).The high pressure in the climate control system, measured by the 4 stage pressure switch, determines the switching on of the second speed.If the engine coolant reaches a higher temperature, the control unit M10 sends an earth signal from pin 23 to the relay R7 which cotnrols the fan N11 2nd speed which turns at maximum speed.This signal comes out of pin A connector C of the engine compartment junction unit B01 .