Engine coolant sensör FIAT MAREA 2000 1.G User Guide

Marea- Marea Weekend 9 ™
2000 range ©
Engine
Fuel feed system
10.
DIAGRAM SHOWING INFORMATION FLOW BETWEN THE INJECTION CONTROL UNIT AND
SENSORS/ACTUATORS
1. Auxiliary fuel pump
2. Variable geometry turbocharger control sole­
noid
3. Climate control compressor
4. Electric EGR valve
5. Rev counter
6. Engine radiator fan
7. Glow plug preheating control unit
8. Potentiometer on accelerator pedal
9. Brake and clutch pedal switches
10. Fuel pressure sensor
11. Intake air flow and temperature sensor (de-
bimeter)
12. Coolant temperature sensor
13. Fuel temperature sensor
14. Pressure relief sensor
15. Timing sensor
16. Rpm sensor
17. Vehicle speed signal
18. Battery
19. Four stage pressure switch
20. Fiat CODE control unit
21. Diagnostic socket
22. Fuel pressure regulator
23. Injectors
24. Throttle valve control solenoid
25. Glow plug preheating warning light
26. Injection system failure warning light
Copyright by Fiat Auto 1

Marea- Marea Weekend 9 ™
2000 range ©) Fuel feed system
Engine
10.
Compents of injection system wiring diagram
1. Vehicle speepd
2. Rev counter
3. Engine radiator fan low speed relay
4. Radiator fan high speed activation relay
5. Potentiometer on accelerator pedal
6. Timing sensor
7. Fuel pressure sensor
8. EGR system modulator solenoid
9. Fuel pressure regulator
10. Glow plug preheating warning light on control panel
11. Injection system failure warning light
12. Air conditioning system relay
13. Coolant temperature sensor
14. Rpm sensor
15. Fuel temperature sensor
16. Diagnostic socket
17. Fiat CODE control unit
18. Four stage pressure switch
19. Injection electronic control unit
20. Pressure relief sensor
21. 7.5A fuse protecting electronic injection system ( + 15 power supply from ignition switch)
22. 7.5A fuse protecting electronic injection system ( + 30 power supply from ignition switch)
23. Main injection system relay
24. 30A fuse protecting injection system
25. Auxiliary fuel pump relay
26. Glow plug preheating control unit
27. Intake air flow and temperature sensor (debimeter)
28. Brake pedal switch
29. Clutch pedal switch
30. Ignition switch
31. Battery
32. Inertia switch
33. Auxiliary fuel pump (submerged in tank)
34. 60A fuse protecting glow plug control unit
35. Cylinder no. 1 glow plug
36. Cylinder no. 2 glow plug
37. Cylinder no. 3 glow plug
38. Cylinder no. 4 glow plug
39. Cylinder no. 1 injector
40. Cylinder no. 2 injector
41. Cylinder no. 3 injector
42. Cylinder no. 4 injector
43. Throttle valve control solenoid
44. Variable geometry turbocharger control solenoid
45. Diesel filter heater relay
Copyright by Fiat Auto 9

Ma tea- Ma tea Weekend !@ ™
2000 range ©
Engine
Fuel feed system
10.
37 Not connected
38 Not connected
39 Not connected
40 Not connected
41 Not connected
42 Not connected
43 Not connected
44 Not connected
45 Not connected
46 Not connected
47 Engine rpm signal output
48 Diagnostic line k
49 Vehicle speed signal input
50 Not connected
51 Activation signal from 4-stage pressure switch
52 Activation signal from 3-stage pressure switch
53 Not connected
54 Not connected
55 Not connected
56 Not connected
57 Not connected
58 Key ON signal
59 Brake switch
60 Air conditioner activation request
61 Clutch switch
62 Glow plug diagnosis
63 Not connected
64 Not connected
65 Not connected
66 Not connected
67 Not connected
68 Not connected
69 Not connected
70 Not connected
71 Not connected
72 Not connected
73 Not connected
74 Not connected
75 Not connected
76 Accelerator pedal 1 earth
77 Accelerator pedal 1 signal
78 Accelerator pedal 1 power supply
79 Accelerator pedal 2 earth
80 Accelerator pedal 2 signal
81 Accelerator pedal 2 power supply
82 Diesel temperature sensor (pin 1)
83 Diesel temperature sensor (pin 2)
84 Coolant temperature sensor (pin 1)
85 Coolant temperature sensor (pin 2)
86 Air flow meter (pin 1)
87 Not connected
88 Air flow meter (pin 3)
89 Air flow meter (pin 5)
90 Fuel pressure sensor (pin 3)
91 Fuel pressure sensor (pin 2)
92 Fuel pressure sensor (pin 1)
93 Turbo pressure sensor (pin 1)
94 Turbo pressure sensor (pin 3)
95 Turbo pressure sensor (pin 2)
96 Not connected
97 Air flow meter (pin 4)
98 Not connected
99 RPM sensor (pin 1)
100 RPM sensor (pin 2)
101 RPM sensor (pin 3)
102 RPM sensor (pin 1)
103 Timing sensor (pin 2)
104 Timing sensor (pin 3)
105 Not connected
106 Not connected
107 Not connected
108 Fuel pressure regulator
109 Fuel pressure regulator
110 Not connected
111 Heater relay control Fuel filter
112 Not connected
113 Not connected
114 Cylinder 4 injector control
115 Not connected
116 Not connected
117 Cylinder 1 and 2 injector power supply
118 Cylinder 3 and 4 injector power supply
119 Cylinder 1 injector control
120 Cylinder 2 injector control
121 Cylinder 3 injector control
Copyright by Fiat Auto 11

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

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

Electrical equipment
Component location
Marea- Marea Weekend
2000 range ®
Climate control system/heater with thermostatic adjustment (1910 JTO)
Component key
Power fusebox
Junction unit
Instrument panel
Right front earth
Engine battery earth
Battery
Ignition switch
Connection between right/left front cables
Connection between facia/rear cables
Switch control unit
Connection between
front door cables
Right door mirror
Connection between
cables
Connection for air conditioning unit ca­
bles
124 Air condiitoning compressor control relay
127 Connection between front left ca­
ble/cable on relay holder bracket
Air conditioner compressor
I.E. system relay feed
Heater/air conditioner unit control sym­
bol lighting bulbs
Climate control system fan
Fan speed adjustment switch
3
4
6
9
10
11
12
13
28
34
36
68
70
120
147
150
202
206
207
dashboard/right
dashborad/front
209 Air intake flap control actuator
211 Frost sensor
233 Thermal relay on engine coolant pump
244 Integrated services control system
253 Air conditioner control unit
254 Climate control system controls with in­
terior temperature sensor
255 Electronic speed variator for climate control
fan
256 Air mixing control actuator
258 Treated air temperature sensor
259 Required temperature adjustment sole­
noid
260 MAX-DEF microswitch
333 Injection control unit (JTD)
334B I.E. protective fuse (JTD)
365 4-stage pressure switch
375 Standardized diagnostic socket
55.
36 Connection between dashboard/right front door cables
' S 28B.
HG310D
GN 244A
Z28B*
SN 28B
A n.d.
AG n.d.
B310E
MN n.d
LR66
BN 111B
HV66
1 20 Connection for air conditioning unit cables
' Z 28B
*N22.
"AN 70
.Zn.d.
1 27 Connection between front left cable/cable on relay holder bracket
JTD
HL BR n.d.
_ALMNI3*
HL AR n.d.
HL MG 333A'
HL GN55
HL AR n.d. *
HL AG 333A A8 RG289
_A1_ BR 303 B4 B365 A2 MN 124* $ B5 VG 365 * A3 AR124 B6 N365 A4 MG 124* $ B7 BN 365 A5 GN 304 B8 VN 98 A6 HN 304 * C1 SG 98 A7 AG 122 C2 M 124*[*g A8 RG304 C3 Cn.d. B1 RN 98 C4 AB n.d. B2 HL 98 C8 R152 B3 S365*
The cables involved in the wiring diagram are marked with an asterisk.
54 Print n° 506.763/23