2001 FIAT MAREA thermostat

Technical Data Marea-Marea Weekend
Engine: cooling system • fuel system 2000 range (§)
OO.io
COOLING
Cooling circuit coolant circulation via centrifugal pump, radiator
and two speed fan operated by engine control unit
Water pump operated via belt
fl (^+\ STA9E 1 90°H-94°C 96°+97T
^ Engagement vj^/ ?
of fan stage Z 95°+99°C (•) 101+102°C
\f Operated by v .
control unit (s\oo\ 9 85V89X 93°-H94T
• v y
v—' stage 2 90°+94°C (•) 98+99T
opening starts 81° - 85°C
Engine coolant
thermostat rnax opening 99+103°C 101DC+105'C
valve travel 9.5 mm
Fitting clearance between impeller p
vanes and pump casing j |< 0.3:1.1 mm 0.4 : 0.95 mm
Pressure for checking system water tightness 0.98 bar
Pressure for checking exhaust valve on expansion
tank cap 0.98 bar
(•) Versions with climate control
FUEL FEED SYSTEM
Make
Electronic integrated
injection-ignition
MPI - I.A.W.
Weber-Marelli
Electronic integrated
injection-ignition
MPI - BOSCH Motronic
Pump electric immersed in the tank
Output > 120 l/h
Fuel pressure regulator setting 3 bar
26 Print n° 506.763/23

Fuel feed system
Engine Marea- Marea Weekend 9 ™
2000 range (Q)
10.
Control of idle speed
On the basis of signals from the rpm sensor and engine coolant temperature sensor, the injection control
unit controls the pressure governor and alters the injector control times to maintain idle speed stable at all
times.
Under certain conditions, the idle speed control unit also considers battery voltage.
Control of maximum speed limitation
According to rpm level, the injection control unit limits maximum speed by means of two types of inter­
vention:
- as maximum speed approaches, it reduces the amount of fuel injected to reduce line pressure;
- when maximum speed is exceeded, it inhibits operation of the auxiliary pump and injectors.
Control of maximum torque limitation
On the basis of rpm level, the injection control unit computes limit torque and maximum permitted fume
index parameters on the basis of predefined, stored maps.
It then corrects the above parameters using engine coolant temperature and car speed data. The resulting
values are then used to modulate the amount of fuel to be injected by adjusting the pressure regulator and
injectors.
Control of fuel temperature
The injection control uint is kept constantly informed of fuel temperature by a sensor on the return mani­
fold.
If fuel temperature exceeds a set value (about 110 °C), the control unit reduces line pressure by adjusting
the pressure governor, leaving injection times unaltered.
Control of coolant temperature
The injection control unit is constantly informed of coolant temperature by a sensor on the thermostat.
If engine coolant temperature or air conditioning fluid pressure exceeds certain levels, the control unit
performs the following actions:
- It reduces the amount of fuel injected by adjusting the pressure governor and injectors (power reduc­
tion);
- it controls the engine radiator cooling fan.
Control of glow plugs
The injection control unit controls operation of the glow plug preheating control unit to bring the tem­
perature in the combution chambers up to levels that promote fuel self-ignition and thus make start-up
easier.
The control unit controls the operation of the glow plug control unit for a certain time both before (pre­
heating) and after (postheating) engine start-up and also controls activation of the warning light on the
control panel.
Preheating, postheating and glow plug warning light activation times vary according to engine coolant
temperature.
4 Publication no. 506.763/24

Marea- Marea Weekend 9™
2000 range (§)
4F015XJ03
Engine
Fuel feed system
ijo.
ENGINE COOLANT TEMPERATURE
SENSOR
The sensor is fitted to the thermostat and
measures the temperature of the engine cool­
ant by means of an NTC thermistor with a
negative resistance coefficient.
Because the sensor is made using semicon­
ductor technology, the resistance falls if sen­
sor element temperature rises with increasing
coolant temperature.
Because resistance does not change in linear
manner, it is higher at low temperatures than
at high temperatures for the same temperature
increase.
1. NTC resistance
2. Sensor case
3. Electrical connector
FUEL TEMPERATURE
SENSOR
The sensor is fitted on the return manifold and
measures fuel temperature by means of an
NTC thermistor with a negative resistance co­
efficient.
Refer to the previous description of the cool­
ant temperature sensor for sensor operation.
FUEL PRESSURE SENSOR
The sensor is fitted in the middle of the fuel
delivery manifold (rail) and is responsible for
providing a return signal (feedback) to the
control unit in order to:
- adjust injection pressure;
- regulator injection duration.
Copyright by Fiat Auto 15

Engine
Fuel feed system
JTD Marea-Marea Weekend 9
2000 range ©
E.G.R.
TOR
VALVE SELF-ADJUSTMENT MO-
Removing-refitting
- Disconnect the negative battery lead, then
remove the sound insulation shield follow­
ing the instructions in the previous para­
graphs.
1. Disconnect the electrical connection (1),
then loosen the bolts fixing the E.G.R.
valve self-adjustment motor and remove it.
E.G.R. VALVE HEAT EXCHANGER
Removi ng - ref itti ng
- Remove the throttle casing and the E.G.R.
valve following the instructions in the pre­
vious paragraphs.
2. Remove the hose connecting the throttle
casing to the intercooler.
- Drain the engine coolant.
3. Disconnect the pipes shown in the figure
from the thermostat, acting on the retaining
bands, then disconnect the electrical con­
nection (1) for the engine coolant tem­
perature sensor.
4. Undo the bolts fixing the heat exchanger
pipe to the exhaust manifold.
32 0"" Und«r 4 Print n° 506.763/25

Marea- Marea Weekend 9
2000 range ©
Engine
Fuel feed system
Open the band (1) retaining the oil vapour
recovery pipe, then undo the bolts (2) fix­
ing the E.G.R. valve heat exchanger
mounting bracket.
Undo the nut (1), located under the ther­
mostat, fixing the heat exchanger.
Disconnect the band (1) retaining the cool­
ant pipe for the heat exchanger.
Undo the bolts shown in the diagram and
remove the thermostat to allow the subse­
quent extraction of the heat exchanger.
Remove the heat exchanger from the en­
gine compartment.
Copyright by Fiat Auto VK01 - Update ,f 33

Electrical system Marea-Marea Weekend
Wiring diagrams 2000 range (jcj)
55.
DESCRIPTION
Marea-Marea Weekend
DESCRIPTION lnp> Ittpl a.t
PREDISPOSITION FOR CAR PHONE AND TELEPASS 33 33 33 33
ELECTRIC SUN-ROOF 35 35 35 35
HEADLLAMP ALIGNMENT CORRECTOR 37 37 37 37
ADJUSTABLE, HEATED FRONT SEATS 39 39 39 39
AIR BAG AND PRETENSIONERS AND FAILURE WARNING LIGHT 41 41 41 41
AIR BAG WITH SIDE BAG AND PRETENSIONERS AND FAILURE WARNING LIGHT 43 43 43 43
WINDSCREEN WASH/WIPE - REAR WASH/WIPE - HORNS - HEATED REAR WINDOW - HEADLAMP WASHER 45 45 45 45
INSTRUMENT PANEL CONNECTIONS 47 49 47 47
CHECK PANEL/DOOR CHECK CONNECTIONS — — — —
THERMOSTATICALLY-ADJUSTABLE CLIMATE CONTROL SYSTEM/HEATER 51 51 53 55
ADDITIONAL HEATER — — 57 —
VERSIONS WITH CLIMATE CONTROL
ENGINE COOLING 59 59 61 63
VERSIONS WITHOUT CLIMATE CONTROL
ENGINE COOLING 65 65 61 —
Xll-Oa-i.Supersedes previous version 'u • Publication no. 506.763/24

Marea-Marea Weekend
2000 range ®
Electrical equipment
Wiring diagrams
55.
Climate control system/heater with thermostatic adjustment (1596)
„ _ (U -j ^ Z QD pq ID 5T ^
259 207 211 258
Variants for C.A.
Copyright by Fiat Auto 51

Electrical equipment
Component location
Marea- Marea Weekend
2000 range ®
Climate control system/heater with thermostatic adjustment (1596)
Component key
3 Power fusebox
4 Junction unit
6 Instrument panel
9 Right front earth
10 Engine battery earth
11 Battery
12 Ignition switch
13 Connection between right/left front cables
28 Connection between facia/rear cables
34 Switch control unit
36 Connection between dashboard/right
front door cables
68 Right door mirror
70 Connection between dashborad/front ca­
bles
120 Connection for air conditioning unit ca­
bles
124 Air condiitoning compressor control relay
127 Connection between front left cable/cable
on relay holder bracket
147 Air conditioner compressor
195 Ignition/injection control unit (1596)
202 Heater/air conditioner unit control symbol
lighting bulbs
206 Climate control system fan
207 Fan speed adjustment switch
209 Air intake flap control actuator
211 Frost sensor
222 Earth for air conditioning system
233 Thermal switch on engine coolant pump
244 Integrated services control system
253 Air conditioner control unit
254 Climate control system controls with inte­
rior temperature sensor
255 Electronic speed variator for climate control
fan
256 Air mixing control actuator
258 Treated air temperature sensor
259 Required temperature adjustment solenoid
260 MAX-DEF microswitch
365 4-stage pressure switch
375 Standardized diagnostic socket
55.
36 Connection between dashboard/right front door cables
* S 28B.
HG310D
GN 244A
Z28B
N 19 _
A n.d.
AG n.d
B310E
MN n.d.
LR66
BN 111B
HV66
AG 68
MN 68
1 20 Connection for air conditioning unit cables
1Z 28B.
*N22.
"AN 70
' RN 70.
. Z n.d.
127
1596
Connection between front left cable/cable on relay holder bracket
62 AN n.d. *
B3 MG 195A*
A2 RN 13 B4 S195A*
A4 AB 195A B5 VN3A
A5 AG 195A B6 B195A
A6 M3A* B7 VG70*
A7 MN 13* C2 BN 195A
A8 Cn.d. C3 HL n.d.
C4 SG n.d.
RN 98
_AlAV123 g*]
A5 AG 122
_A6_ M 124 * [§]
JiL MN 124 *[§]
_*!L C n.d.
_§?_ AN 124*[§]
_B3_MG 124 *§]
-US 365* [$]
J*!LVN98
J?6. B 365 [ffi
_g7_ VG 365*[ _2?_BN365 [§]
_Pi_ HL98
_?i_SG 98
The cables involved in the wiring diagram are marked with an asterisk.
52 Print n° 506.763/23