Fiat MULTIPLA 1.9 JTD 8V da 04/02 a 08/03 – ENGINE COOLING – – Euro 3 – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram

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Components

Component code Name Assembly reference

A1 Battery B5 MAXI FUSE box B8 Engine fan fuse (MAXI FUSE) -

B8 Engine fan fuse (MAXI FUSE) -

B25 Ignition-operated services supply fuse 1554 -

B35 Injection memory and CODE fuse -

C10 Left front earth -

D4 Front/engine junction -

2890084"> -

2890084 -

H1 Ignition switch -

2890548"> -

2890548 -

J31 Engine fan 2nd speed relay -

K5 3 stage pressure switch K10 4 stage pressure switch K10 4 stage pressure switch M10 Engine management ECU M10 Engine management ECU M10 Engine management ECU -

M10 Engine management ECU M10 Engine management ECU 2891479Op. 1058A GAS CIRCUIT MULTI POINT INJECTION

M10 Engine management ECU N11 Engine electric fan motor O10 Engine fan adjustment resistor 2891336Op. 1088E coolant temperature control devices

Location of components

Get access to all wiring diagrams of the car

Components

Component code Name Assembly reference

A1 Battery B5 MAXI FUSE box B8 Engine fan fuse (MAXI FUSE) -

B8 Engine fan fuse (MAXI FUSE) -

B25 Ignition-operated services supply fuse 1554 -

B35 Injection memory and CODE fuse -

C10 Left front earth -

D4 Front/engine junction -

2890084"> -

2890084 -

H1 Ignition switch -

2890548"> -

2890548 -

J31 Engine fan 2nd speed relay -

K5 3 stage pressure switch K10 4 stage pressure switch K10 4 stage pressure switch M10 Engine management ECU M10 Engine management ECU M10 Engine management ECU -

M10 Engine management ECU M10 Engine management ECU 2891479Op. 1058A GAS CIRCUIT MULTI POINT INJECTION

M10 Engine management ECU N11 Engine electric fan motor O10 Engine fan adjustment resistor 2891336Op. 1088E coolant temperature control devices

DescriptionThe engine radiator and air conditioner condenser cooling system consists of one fan operated 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 or pressure threshold.The operation of the fan is achieved by means of two special relays located in the relay and fuse box in the engine compartment.The fan supply line is protected by a special maxifuse, located next to the above mentioned box, whilst the circuit for energizing the relays is protected by the fuse which protects other services.The fan therefore only comes on when the ignition is switched ON.

Functional description The supply for the fan N11 arrives directly from the battery from the line for the maxifuse B8 : the fan therefore operates when it receives an earth command. The relays J30 and J31 have coils supplied by the line for maxifuse UGD of B5 protected by fuse B35. They are energized by an earth signal coming from the engine control unit M10 . if the coolant temperature reaches the first temperature stage, or the 4-stage pressure switch K10 - pin 3 - indicates to control unit M10 - pin 52 of connector A - that the first pressure stage has been reached, control unit M10 sends a signal to 1st speed relay R7 from pin 20 of connector A. The relay then sends an earth signal which, via the additional resistance O10 , operates the fan N11 which rotates at the first (slow) speed. If the engine coolant reaches a higher temperature level or the 4 stage pressure switch K10 (pin 1) signals to the control unit M10 (pin 51 of connector A) that a high pressure stage has been reached, then the control unit M10 sends an earth signal (from pin 19 of connector A) to the 2nd speed fan relay J31 which energizes the coil. The relay then sends an earth signal directly to the fan N11 which rotates at the maximum speed.