Telephone:

Fax:

VAT Registration No.:

Name:

Manufacturer:

Fiat

Address:

Model:

UNO 1.0 156A2.246

Year:

1995

Registration:

Tel - Private:

Mileage:

Tel - Business:

Job number:

Vehicle identification

Notes

Specified value

Measured value

No. of cylinders

Type 4/OHC

Capacity (Fiscal)

cc 999

Compression ratio

:1 9,0

Suitable for unleaded petrol

Yes

Minimum octane rating

RON 95

Ignition system

Description Trans-i

Trigger location

Distributor

Fuel system

Make Bosch

Fuel System

Type Mono-Jetronic

Fuel System

Description TBI-i

Combined ignition and fuel ECM

No

Diagnostic socket

Yes

Ignition system

Notes

Specified value

Measured value

Ignition coil

Make Marelli

Ignition coil

Type BAE 506D

Ignition coil supply voltage

+ with ballast V 11,0

Primary resistance

Ohm 0,6-0,8

Secondary resistance

Ohm 2970-3630

Firing order

1-3-4-2

Distributor (ECM)

Make Marelli

Distributor (ECM)

No. SE 101C

Contact breaker gap/trigger air gap

mm 0,3-0,4

Tuning and emissions

Notes

Specified value

Measured value

Ignition timing

o = without + = with

vacuum

o

Ignition timing - basic BTDC

°Engine/rpm 2±2/850

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Ignition advance

Without vacuum and
basic timing

Ignition advance checks

°Engine/rpm 0-4/1000

Ignition advance checks

°Engine/rpm 14-18/2600

Ignition advance checks

°Engine/rpm 26-30/4200

Vacuum check

+ = advance o = retard +

Vacuum range

°Engine 12-14

Vacuum starts

mbar 133

Vacuum ends

mbar 307

Idle speed

rpm 850±50 Not adjustable

Oil temperature for CO test

°C 60

CO level at idle speed - tailpipe

Vol. % CO 0,35 Max Not adjustable

CO level at idle speed - tailpipe (Cat)

Vol. % CO 0,35 Max Not adjustable

CO level at idle speed - sample pipe

Vol. % CO 0,7±0,5 Not adjustable

HC level at idle speed

ppm 100

CO2 level at idle speed

Vol. % CO2 14,5-16

O2 level at idle speed

Vol. % O2 0,1-0,5

Increased idle speed for CO test

rpm 2500-2900

CO content at increased idle speed

Vol. % 0,3

Lambda at increased idle

λ 0,97-1,03

Spark plugs

Notes

Specified value

Measured value

Spark plugs

Original equipment Champion

Spark plug

Type RC9YC

Electrode gap

mm 0,6

Spark plugs

Make Autolite

Spark plug

Type APP3923

Electrode gap

mm 0,9

Spark plugs

Make Beru

Spark plug

Type 14FR-7DU

Electrode gap

mm 0,7

Spark plugs

Make Bosch

Spark plug

Type FR7DC2

Electrode gap

mm 0,9

Spark plugs

Make Champion

Spark plug

Type RC9YC

Electrode gap

mm 0,6

Spark plugs

Make NGK

Spark plug

Type BCPR6E-VG

Electrode gap

mm 0,7

Fuel system

Notes

Specified value

Measured value

System pressure without vacuum

bar 1,06±0,06

Service checks and adjustments

Notes

Specified value

Measured value

Valve clearance -INLET

mm 0,30±0,05 cold

Valve clearance -EXHAUST

mm 0,40±0,05 cold

Oil pressure

bar/rpm 3,4-4,9

Radiator cap

bar 0,98

Thermostat opens

°C 85-89

Lubricants and capacities

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Notes

Specified value

Measured value

Engine oil grade - cold climate

SAE 10W/30 Semi-Synth.

Engine oil grade - moderate climate

SAE 15W/40 Semi-Synth.

Engine oil grade - hot climate

SAE Semi-Synth.

Engine oil classification

API/ACEA SH/A3-96

Engine oil grade - alternative - moderate climate

SAE 10W/40 Synth.

Engine oil classification - alternative - moderate
climate

API/ACEA SH/A3-96

Engine with filter

litres 3,75

Gearbox oil grade

SAE 75W/90 Semi-Synth.

Gearbox 4/5 speed

litres 2,4

Cooling system

litres 4,4

Brake fluid

Type DOT 3/4

Brake fluid

litres 0,4

Power steering fluid

Type Dexron II

Tightening torques

Notes

Specified value

Measured value

Cylinder head instructions

Cylinder head

Renew bolts No

Stage 1

Tighten 20 Nm

Stage 2

Tighten 30 Nm

Stage 3

Tighten 90°

Stage 4

Tighten 90°

Other tightening torques

Main bearings

Renew bolts/nuts No

Main bearings

Stage 1 40 Nm

Main bearings

Stage 2 90°

Big end bearings

Renew bolts/nuts No

Big end bearings

Stage 1 20 Nm

Big end bearings

Stage 2 41 Nm

Sump bolts

8 Nm

Flywheel/driveplate

44 Nm

Clutch to flywheel

14 Nm

Crankshaft pulley/damper

80 Nm

Camshaft sprocket/gear

90 Nm

34

Camshaft carrier/cap

Camshaft/rocker cover

8 Nm

Inlet manifold to cylinder head

27 Nm

Exhaust manifold to cylinder head

27 Nm

Spark plugs

27 Nm

Oxygen sensor (Lambda)

55 Nm

Front hub

275 Nm

Rear hub

216 Nm

Steering track rod end

34 Nm

Brake caliper carrier to hub

Front 57 Nm

Road wheels

86 Nm

Starting and charging

Notes

Specified value

Measured value

Battery

V/RC(Ah) 12/44 (32)

Starter motor

Make Marelli

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Starter motor

Type E95 0,8kW

Maximum cranking amps

A 86-106

Alternator/Regulator

Make Marelli

Alternator/Regulator

Type AA 125R-14V-55A

Alternator output at engine speed

A/V/rpm 55/14/3500

Voltage regulator

Type RTT 119AC

Regulated voltage

V 14,3-14,6

Brake disc and drum dimensions

Notes

Specified value

Measured value

Minimum disc thickness - solid

Front 9 mm

Minimum disc thickness - ventilated

Front 18,2 mm

Minimum disc thickness

Rear 9 mm

Disc runout

Front 0,15 mm

Maximum drum diameter

Rear 186,8 mm

Minimum pad thickness

Front 1,5 mm

Minimum shoe thickness

Rear 1,5 mm

Handbrake travel

No. of notches 4-5

Autodata Note 34

Camshaft cap bolts

M8 = 20 Nm
M6 = 10 Nm.

Cylinder layout

Timing mark

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Tightening sequence

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

VIN plate/Engine code location

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Telephone:

Fax:

VAT Registration No.:

Name:

Manufacturer:

Fiat

Address:

Model:

UNO 1.0 156A2.246

Year:

1995

Registration:

Tel - Private:

Mileage:

Tel - Business:

Job number:

Trouble code identification

Fault location

Probable cause

Accelerator pedal position (APP)
sensor - implausible signal

Wiring, APP sensor, ECM

AC signal

Wiring, AC system, AC control module

Air conditioning relay - circuit
malfunction

Wiring, supply voltage, AC system

Barometric pressure (BARO) sensor

Wiring, BARO sensor, ECM

Camshaft position (CMP) actuator -
circuit malfunction

Wiring, CMP actuator relay, CMP actuator, ECM

Camshaft position (CMP) sensor -
circuit malfunction

Wiring, CMP sensor, ECM

1

Closed throttle position (CTP) switch -
malfunction

Wiring, mechanical fault, ISC actuator, ECM

Crankshaft position (CKP)
sensor/engine speed (RPM) sensor -
malfunction

Wiring, air gap, CKP/RPM sensor, mechanical fault, ECM

Engine control module (ECM) -
defective

ECM

Engine control relay

Wiring, supply voltage, engine control relay

Engine coolant temperature (ECT)
sensor - open/short circuit

Wiring, ECT sensor, ECM

Evaporative emission (EVAP) canister
purge valve - circuit malfunction

Wiring, supply voltage, EVAP canister purge valve, ECM

Fuel pump relay

Wiring, supply voltage, fuel pump relay

Heated oxygen sensor (HO2S)

Wiring, HO2S, air leak, ECM

Idle air control (IAC) valve

Wiring, IAC valve, ECM

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Idle speed control (ISC)
actuator/throttle motor

Wiring, ISC actuator/throttle motor, mechanical fault, ECM

Idle control - outside specification

Intake leak/blockage, throttle valve tight/sticking, IAC valve or ISC
actuator, ECM

Ignition amplifier - malfunction

Wiring, supply voltage, ignition coil, ignition amplifier, ECM

Ignition switch - circuit malfunction

Wiring, supply voltage, ignition switch

Immobilizer circuit - malfunction

Wiring, immobilizer defective, ECM

Injector(s) - malfunction

Wiring, supply voltage, injector

Injector 1

Wiring, fuse, engine control relay/relay module, injector

Injector 2

Wiring, fuse, engine control relay/relay module, injector

Injector 3

Wiring, fuse, engine control relay/relay module, injector

Injector 4

Wiring, fuse, engine control relay/relay module, injector

Injector 5

Wiring, fuse, engine control relay/relay module, injector

2

Intake air temperature (IAT) sensor -
open/short circuit

Wiring, IAT sensor, ECM

Intake manifold air control solenoid -
circuit malfunction

Wiring, intake manifold air control solenoid, ECM

Knock sensor(s) (KS)

Wiring, KS, KS incorrectly tightened, ECM

Malfunction indicator lamp (MIL) - circuit
malfunction

Wiring, supply voltage, MIL

3

Manifold absolute pressure (MAP)
sensor - malfunction

Intake/exhaust leak, wiring, MAP sensor, ECM

Mass air flow (MAF) sensor

Wiring, intake leak, air filter blocked, MAF sensor, ECM

Mixture control (MC)

Fuel level low, fuel pressure/pump, intake/exhaust leak, misfire,
MAP/MAF sensor, HO2S, EVAP canister purge valve, injector(s),
excessive fuel in engine oil

Mixture control (MC) - rich

Wiring, injector, fuel pressure, MAF sensor, ECM

Mixture control (MC) - weak

Wiring, air leak, fuel pressure, ignition system, injector, MAF sensor,
HO2S, ECM

Relay module

Wiring, supply voltage, relay module

Supply voltage

Wiring, fuses, battery, alternator, ignition switch

4

Throttle position (TP) sensor

Wiring, TP sensor, ECM

Transmission control module (TCM) -
incorrect signal

Wiring, ECM

Turbocharger (TC) pressure - control
difference

Intake/exhaust leak, hoses interchanged/not connected, MAP sensor,
TC wastegate regulating valve, turbocharger (TC) wastegate actuator,
TC

Turbocharger (TC) wastegate
regulating valve

Wiring, supply voltage, TC wastegate regulating valve, ECM

Vehicle speed signal

Wiring, VSS, ECM

1

Located in idle speed control (ISC) actuator.

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

2

Some models: Located in manifold absolute pressure (MAP) sensor.

3

Punto GT: Located in engine control module (ECM).

4

Some models: Located in idle speed control (ISC) actuator.

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Telephone:

Fax:

VAT Registration No.:

Name:

Manufacturer:

Fiat

Address:

Model:

UNO 1.0 156A2.246

Year:

1995

Registration:

Tel - Private:

Mileage:

Tel - Business:

Job number:

Dimensions

Notes

Specified value

Measured value

Wheelbase

mm 2362

Track - front/rear

mm 1343/1300

Tightening torques

Notes

Specified value

Measured value

Tightening torque - steel wheels

86 Nm

Tightening torque - alloy wheels

86 Nm

Trackrod locknut/clamp

34 Nm

Checking range - Front wheels

Notes

Specified value

Measured value

Load positioning

unladen

Toe-in (N = negative, toe-out)

mm 0 - 2

Toe-in

deg 0° - 0°22'

Toe-in

deg-1/100 0 - 0,37

Camber

deg 0° - 1°N

Camber

deg-1/100 0 - 1N

Castor

deg 1°55' - 2°25'

Castor

deg-1/100 1,92 - 2,42

Setting data - Four wheels

Notes

Specified value

Measured value

Load positioning

unladen

Toe-in (N = negative, toe-out)

mm 1±1

Toe-in

deg 0°11'±11'

Toe-in

deg-1/100 0,18±0,18

Camber

deg 0°30'N±30'

Camber

deg-1/100 0,50N±0,50

Camber adjustment

Not adjustable

Castor

deg 2°10'±15'

Castor

deg-1/100 2,17±0,25

Castor adjustment

Not adjustable

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Lock angles - max. inner

deg 39°8'

Lock angles - max. inner

deg-1/100 39,13

Lock angles - max. outer

deg 32°58'

Lock angles - max. outer

deg-1/100 32,97

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Telephone:

Fax:

VAT Registration No.:

Name:

Manufacturer:

Fiat

Address:

Model:

UNO 1.0 156A2.246

Year:

1995

Registration:

Tel - Private:

Mileage:

Tel - Business:

Job number:

Uno 1982-96

Rim size Tyre size

Model Front bar(psi) Rear bar(psi)

4,5x13

135 R 13 S

1,9 (27)

1,9 (27)

4,5x13

155/70 R 13 S

1,9 (27)

1,9 (27)

4,5x13

165/65 R 13/S

1,9 (27)

1,9 (27)

5,5x13

175/60 R 13/H

2,2 (31)

2,2 (31)

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Telephone:

Fax:

VAT Registration No.:

Name:

Manufacturer:

Fiat

Address:

Model:

UNO 1.0 156A2.246

Year:

1995

Registration:

Tel - Private:

Mileage:

Tel - Business:

Job number:

Important note

Important note

The intervals and procedures given are subject to alteration by the manufacturer at
any time.
Check the regularly updated Timing Belts section on our website to ensure that you
are kept informed of any changes that may occur between issues of the Autodata CD.

http://www.autodata-cd.com

Timing belt replacement intervals

The information relating to timing belt replacement intervals is additional to the main purpose of this CD, but is
included to provide guidance to garages and for customer advice.

Where possible the recommended intervals have been compiled from vehicle manufacturers' information. In a
few instances no recommendation has been made by the manufacturer and the decision to replace the belt must
be made from the evidence of a thorough examination of the condition of the existing belt.

Apart from the visible condition of the belt, which is explained fully later in this section, there are several other
factors which must be considered when checking a timing belt:

Is the belt an original or a replacement.

1.

When was the belt last replaced and was it at the correct mileage.

2.

Is the service history of the vehicle known.

3.

Has the vehicle been operated under arduous conditions which might warrant a shorter replacement
interval.

4.

Is the general condition of other components in the camshaft drive, such as the tensioner, pulleys, and
other ancillary components driven by the timing belt, typically the water pump, sound enough to ensure that
the life of the replacement belt will not be affected.

5.

6.

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

If the condition of the existing belt appears good, can you be satisfied that the belt will not fail before the
next check or service is due.

6.

If the belt does fail, have you considered the consequences. If the engine is an INTERFERENCE type then
considerable expensive damage may well be the result.

7.

The cost of replacing a belt as part of a routine service could be as little as 5 to 10% of the repair cost
following a belt failure. Make sure your customer is aware of the consequences.

8.

If in doubt about the condition of the belt - RENEW it.

9.

Replacement Interval Guide

Replacement Interval Guide

Fiat recommend:

1986-12/90:

Every 12,000 miles - check & replace if necessary.
Every 36,000 miles - replace.

01/91-04/91:

Every 24,000 miles - check & replace if necessary.
Every 60,000 miles - replace.

05/91-98:

Every 36,000 miles or 4 years - check & replace if necessary.
Every 63,000 miles - replace.

1999-00 - except New Punto (99-):

Every 36,000 miles or 4 years - check & replace if necessary.
Every 63,000 miles - replace.

1999-00 - New Punto (99-):

Replacement every 72,000 miles or 6 years.

2001

:

Every 36,000 miles or 3 years - check & replace if necessary.
Every 72,000 miles or 5 years - replace.

The previous use and service history of the vehicle must always be taken into account.

Check For Engine Damage

Check For Engine Damage

CAUTION: This engine has been identified as a FREEWHEELING engine in which the possibility of valve-

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

to-piston damage in the event of a timing belt failure may be minimal or very unlikely. However, a
precautionary compression check of all cylinders should be performed.

Repair Times - hrs

Repair Times - hrs

Uno 45/45ie FIRE 1989-96

Remove and install

1,00

Special Tools

Special Tools

Tensioning tool - Fiat No.1860745300/100.

Special Precautions

Special Precautions

Disconnect battery earth lead.
DO NOT turn crankshaft or camshaft when timing belt removed.
Remove spark plugs to ease turning engine.
Turn engine in normal direction of rotation (unless otherwise stated).
DO NOT turn engine via camshaft or other sprockets.
Observe all tightening torques.

Removal

Removal

Raise and support front of vehicle.

1.

Remove:

RH front wheel.
RH splash guard (if necessary).
Auxiliary drive belt.
Coolant expansion tank (if necessary).
Crankshaft pulley bolts [1].
Crankshaft pulley [2].
Timing belt cover(s) [3].

2.

Turn crankshaft clockwise until timing marks aligned [4] & [5].

3.

Slacken tensioner nut to release tension on belt [6].

4.

Remove timing belt.

5.

Installation

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Installation

Ensure timing marks aligned [4] & [5].

1.

Fit timing belt. Observe direction of rotation marks on belt.

2.

Fit tensioning tool locating pegs to tensioner pulley holes [7] & [8]. Tool No.1860745300/100. Ensure
tensioning tool arm is horizontal.

3.

Set weight on scale bar as follows:

Seicento: 80 mm.
Except Seicento: 65 mm.

4.

Turn crankshaft two turns clockwise.

5.

Ensure timing marks aligned [4] & [5].

6.

Tighten tensioner nut to 28 Nm [6].

7.

Remove tensioning tool.

8.

Install components in reverse order of removal.

9.

Tighten crankshaft pulley bolts to 25 Nm [1].

10.

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-

Manufacturer: Fiat

Model: Uno 1,0

Engine code: 156A2.246

Output: 33 (45) 5250

Tuned for: R-Cat

Year: 1993-95

© Autodata Limited 2004

2009-03-20

V5.373-