1983 FIAT UNO clock

14•20 Wiring diagrams
Component key for wiring diagrams 30 to 52
Note: Not all the items listed will be fitted to all models
No Description
1 Injector cooling fan
2 Left front light cluster
3 Left foglamp
4 Left front engine compartment earth
5 Radiator cooling fan
6 Double contact thermostatic switch
on engine radiator
6A Thermostatic switch on engine
radiator
7 Left horn
8 Right horn
9 Resistor for engaging radiator fan 1st
speed
10 Right front light cluster
11 Right foglamp
12 Right front engine compartment earth
13 Battery
14 Ignition coil
15 Ignition distributor with magnetic
impulse generator
16 Left front side direction indicator
17 Ignition power module
18 MPi electronic injection control unit
19 Join between injection/ignition cables
in engine compartment
20 Battery cables join in engine
compartment
21 Antiskid braking system wiring join
22 Starting go-ahead relay
23 Earth for battery
24 Radiator coolant temperature sender
unit for electronic injection
25 Anti-knock sensor
26 Injection system diagnostic socket
27 Switch signalling insufficient engine
oil pressure
28 Radiator coolant temperature sender
unit
29 Engine oil temperature sender unit
30 Engine oil pressure sender unit
31 Right front side direction indicator
32 Engine oil temperature sender unit
cable join
33 Battery recharging signal cable join
34 Windscreen washer pump
35 Rear screen washer pump
36 Reversing switch
37 Fuel injectors relay feed
38 Insufficient brake fluid level sensor
39 Left brake pad wear sensor
40 Microplex electronic ignition control
unit
41 Injection cables join in engine
compartment
42 Ignition cables join in engine
compartment
43 Join between battery cable and
injection cables
44 Join between engine cable and
battery cables
45 Left front brake pad cables join
46 Starter motorNo Description
47 Windscreen wiper motor
48 Headlamp washer pump
49 Fuel injector
50 Fuel injector
51 Fuel injector
52 Fuel injector
53 Supplementary air valve
54 Spark plug
55 Spark plug
56 Spark plug
57 Spark plug
58 Excess supercharging pressure
switch
59 Throttle position switch
60 Engine speed sensor
61 Ignition diagnostic socket
62 Connector block
63 Connector block
64 Alternator
65 Thermostatic switch for injector
cooling fan
66 Right brake pad wear sensor
67 TDC sensor
68 Connector block
69 Connector block
70 Connector block
71 Connector block
72 Join with right brake pad cables
73 Electronic earth
74 Power earth
75 Brake stop-lamp switch
76 20 A fuse for central locking
77 10 A fuse for electric fuel pump
78 30 A fuse for radiator cooling fan
79 30 A fuse for electric windows
80 10 A fuse for injector cooling fan
81 20 A fuse for headlamp
wash/wipe
82 20 A fuse for foglamps
83 Junction box with fuses and relays:
E1 Horn relay (for single tone horns
bridge between 86 and 87)
E2 Heated rear screen relay
E3 Heater (bridge between 85 and 30)
84 Join between front cable and rear
cables
85 Join between front cable and door
ajar sensor cables
86 Earth on dashboard, left hand side
87 Earth on dashboard, right hand
side
88 Choke warning light switch
89 Ignition switch
90 Hazard warning lights switch
91 Steering column switch unit
A Rear screen wash/wipe switch
B Horn button
C Direction indicators switch
D Windscreen wiper intermittent
speed selector switch
E Windscreen/headlamp washer
control switchNo Description
F Rear foglamps/headlamp washer
intermittent device switch
G Headlamp dip switch
H External lights switch
I Flasher switch
92 Foglamp relay
93 Electric fuel pump relay
94 Electric windows relay feed
95 Headlamp wash/wipe intermittent
device
96 Direction indicators/hazard warning
lights flasher unit
97 Central locking receiver
98 Central locking control unit
99 Join with brake pad cables
100 Join between engine cable and
dashboard cables
101 Automatic heater cable join
102 Instrument panel
A Foglamps warning light
B Main beam headlamps warning
light
C Side lights warning light
D Rear foglamps warning light
E Heated rear screen warning light
F Hazard warning lights warning
light
G Direction indicators warning light
H Handbrake applied and insufficient
brake fluid level warning light
I Choke warning light
K Instrument panel light bulbs
L Battery recharging warning light
M Insufficient engine oil pressure
warning light
O Antiskid braking system failure
warning light
P Maximum turbocharging pressure
warning light
Q Brake pad wear warning light
R Door ajar warning light
U Fuel level gauge
V Engine oil pressure gauge
W Engine oil temperature gauge
Y Tachometer
Z Coolant temperature gauge
103 Join with remote control central
locking cables
104 Cigar lighter
105 Radio receiver
106 Heater unit
107 Switch unit
A Heated rear screen switch
B Rear foglamps switch
C Switch unit light bulb
D Rear screen wiper switch
E Foglamps switch
F Clock
108 Left front electric window motor
109 Left front central locking geared
motor
110 Switch signalling left front door ajar

Wiring diagrams 14•39
14
Wiring diagram 47 - fuel gauge, tachometer, digital clock, brake fluid and handbrake warning lamp
(1990-on 45, 55, 70 and 1.4 models)
*Only for 1372 S ie – 1372 SX ie – 1697 D ** Only for D versions sOnly for SX versions

14•40 Wiring diagrams
Wiring diagram 48 - fuel gauge, tachometer, digital clock, brake fluid level sensor, handbrake-on switch, brake pad wear sensor,
door ajar switch and oil pressure/temperature sender units (1372 cc Turbo ie model)

MOT Test ChecksREF•3
REF
Exhaust system
MStart the engine. With your assistant
holding a rag over the tailpipe, check the
entire system for leaks. Repair or renew
leaking sections.
Jack up the front and rear of the vehicle,
and securely support it on axle stands.
Position the stands clear of the suspension
assemblies. Ensure that the wheels are
clear of the ground and that the steering
can be turned from lock to lock.
Steering mechanism
MHave your assistant turn the steering from
lock to lock. Check that the steering turns
smoothly, and that no part of the steering
mechanism, including a wheel or tyre, fouls
any brake hose or pipe or any part of the body
structure.
MExamine the steering rack rubber gaiters
for damage or insecurity of the retaining clips.
If power steering is fitted, check for signs of
damage or leakage of the fluid hoses, pipes or
connections. Also check for excessive
stiffness or binding of the steering, a missing
split pin or locking device, or severe corrosion
of the body structure within 30 cm of any
steering component attachment point.
Front and rear suspension and
wheel bearings
MStarting at the front right-hand side, grasp
the roadwheel at the 3 o’clock and 9 o’clock
positions and shake it vigorously. Check for
free play or insecurity at the wheel bearings,
suspension balljoints, or suspension mount-
ings, pivots and attachments.
MNow grasp the wheel at the 12 o’clock and
6 o’clock positions and repeat the previous
inspection. Spin the wheel, and check for
roughness or tightness of the front wheel
bearing.
MIf excess free play is suspected at a
component pivot point, this can be confirmed
by using a large screwdriver or similar tool and
levering between the mounting and the
component attachment. This will confirm
whether the wear is in the pivot bush, its
retaining bolt, or in the mounting itself (the bolt
holes can often become elongated).
MCarry out all the above checks at the other
front wheel, and then at both rear wheels.
Springs and shock absorbers
MExamine the suspension struts (when
applicable) for serious fluid leakage, corrosion,
or damage to the casing. Also check the
security of the mounting points.
MIf coil springs are fitted, check that the
spring ends locate in their seats, and that the
spring is not corroded, cracked or broken.
MIf leaf springs are fitted, check that all
leaves are intact, that the axle is securely
attached to each spring, and that there is no
deterioration of the spring eye mountings,
bushes, and shackles.MThe same general checks apply to vehicles
fitted with other suspension types, such as
torsion bars, hydraulic displacer units, etc.
Ensure that all mountings and attachments are
secure, that there are no signs of excessive
wear, corrosion or damage, and (on hydraulic
types) that there are no fluid leaks or damaged
pipes.
MInspect the shock absorbers for signs of
serious fluid leakage. Check for wear of the
mounting bushes or attachments, or damage
to the body of the unit.
Driveshafts
(fwd vehicles only)
MRotate each front wheel in turn and inspect
the constant velocity joint gaiters for splits or
damage. Also check that each driveshaft is
straight and undamaged.
Braking system
MIf possible without dismantling, check
brake pad wear and disc condition. Ensure
that the friction lining material has not worn
excessively, (A) and that the discs are not
fractured, pitted, scored or badly worn (B).
MExamine all the rigid brake pipes
underneath the vehicle, and the flexible
hose(s) at the rear. Look for corrosion, chafing
or insecurity of the pipes, and for signs of
bulging under pressure, chafing, splits or
deterioration of the flexible hoses.
MLook for signs of fluid leaks at the brake
calipers or on the brake backplates. Repair or
renew leaking components.
MSlowly spin each wheel, while your
assistant depresses and releases the
footbrake. Ensure that each brake is operating
and does not bind when the pedal is released.
3Checks carried out
WITH THE VEHICLE RAISED
AND THE WHEELS FREE TO
TURN

A
Accelerator cable - 3•12, 13•80
Accelerator control system - 13•75
Accelerator pump -3•7, 3•8, 3•11, 13•66
Acknowledgements - 0•4
Aerial -9•10
Air bags - 0•5
Air cleaner -3•4, 13•60, 13•69, 13•67,
13•75, 13•79
Air pressure switch - 13•70
Air temperature sensor - 13•76
Airflow meter - 13•67, 13•69, 13•80
Alternator -9•3, 13•58, 13•103, 13•104
Alternator fault -9•14
Anti-flooding device -3•8, 3•9, 3•10, 3•11,
13•64
Anti-knock sensor - 13•86, 13•90
Anti-roll bar - 13•111
Antifreeze - 0•6, 0•13, 2•1, 2•2
Antiskid system - 13•103
Armrest - 13•112
Asbestos - 0•5
Auxiliary shaft -1•29, 1•30, 13•51, 13•53
B
Battery -0•5, 9•2
Battery fault -9•14
Bleeding brakes -8•7
Bleeding clutch - 13•94
Bodywork- 12•1et seq, 13•111, REF•4
Bonnet - 12•3, 12•4
Boots -7•2, 10•2, 13•98
Brake fluid -0•13, 8•1, 13•110, 13•111
Braking system-8•1et seq, 13•100,
REF•1, REF•2, REF•3
Braking system fault finding -8•9
Breakerless ignition system - 13•85, 13•86
Bumpers - 12•4, 12•11, 13•113
Burning -0•5
C
Cables -3•12, 5•1, 8•9, 9•8, 13•80
Calipers -8•3, 13•101, 13•102Camshaft -1•19, 1•21, 1•24, 1•29, 1•32,
13•21, 13•30, 13•34, 13•41, 13•42
Capacities -0•6, 13•17
Carburettors -3•6 to 3•11, 13•62 to 13•66
Carpets - 12•2
Cassette player-9•10
Catalytic converter - 13•77
Central door locking -9•11, 13•109
Centre console - 12•9
Check control (warning module) system -
9•12, 9•13, 13•110, 13•111
Choke -3•11, 3•12
Cigar lighter -9•13, 13•109
Clock -9•13, 13•108
Clutch-5•1et seq, 13•83, 13•92, 13•94
Clutch fault finding -5•3
Clutch fluid -0•13
CO emissions (mixture) - REF•4
Coil -4•6, 13•86, 13•90, 13•91
Coil spring - 11•3, 11•4
Condenser -4•5
Connecting rods -1•12, 1•18, 1•22, 1•26,
1•30, 13•25, 13•26, 13•30, 13•35,
13•47, 13•48, 13•53
Console - 12•9
Constant velocity joint -0•13, 7•3, 13•98,
13•99
Contact breaker points -4•2, 4•3
Contents -0•2
Control panel - 13•108
Conversion factors -0•14
Coolant -0•6, 0•13, 2•1, 2•2, 13•69, 13•70,
13•110, 13•111
Coolant pump -2•4, 13•55, 13•58
Cooling and heating systems-2•1et seq,
13•54, 13•55
Cooling and heating systems fault finding -
2•8
Courtesy lamp -9•5, 9•8
Crankcase -1•17
Crankcase ventilation system -1•8
Crankshaft -1•18, 1•20, 1•30, 1•31, 13•44,
13•45, 13•52
Crossmember - 11•4
Crushing -0•5
CV joints -0•13, 7•3, 13•98, 13•99
Cylinder block -1•17Cylinder head -1•10, 1•16, 1•19, 1•22,
1•25, 1•28, 1•32, 13•19, 13•22, 13•30,
13•34, 13•43, 13•44, 13•53
D
Dents in bodywork - 12•2
Depressurisation (fuel system) - 13•75
Digiplex 2 ignition system - 13•90
Dim-dip system - 13•106
Dimensions -0•6, 13•17
Direction indicators -9•7
Discs -8•4, 13•101, 13•102
Distributor -4•3, 4•5, 13•86, 13•89, 13•90,
13•92
Doors -9•11, 12•5, 12•6, 12•7, 13•111,
13•112, 13•114, REF•2
Drivebelts -2•3, 13•58
Driveshaft
Driveshafts and hubs fault finding -7•6
Driveshafts,hubs,roadwheels and tyres-
0•13, 7•1et seq, 10•4, 11•3, 11•6,
13•98, 13•99, REF•3, REF•4
Drums -8•4
Dwell angle -4•4
E
Economy gauge (Econometer) -3•11, 9•12
Electric shock -0•5
Electric windows -9•11, 13•109
Electrical control circuit (ECU) - 13•67,
13•71, 13•81, 13•86, 13•90
Electrical system-9•1et seq,13•103,
REF•2
Electrical system fault finding -9•14,
REF•9
Electronic ignition -4•3, 4•6, 4•7
Engine-1•1et seq, 13•19, 13•33, 13•37
Engine fault finding -1•35, 1•36, 2•8, 3•13,
4•9, 13•92, REF•10, REF•11
Engine oil -0•6, 0•13, 1•3, 1•4, 1•8
Engine speed sensor -4•7, 13•89, 13•91
Environmental considerations - REF•8
Exhaust emission checks - REF•4
Exhaust manifold - 13•77
Exhaust system -3•12, REF•3
IndexREF•17
REF
Note: References throughout this index relate to Chapter•page number