2000 FIAT MAREA service

Marea- Marea Weekend Summary
TECHNICAL SERVICE MANUAL COMPOSITION
At present, June 2001, the Marea-Marea Weekend 4th volume manual is composed of the following
sections
Print N° Sections Page
Nos. Notes
506.763/18
(XI/1999)
00 1 - 12 Marea bipower technical data (99 range)
506.763/18
(XI/1999) 10 1 - 59 Marea bipower fuel system (99 range) 506.763/18
(XI/1999)
55 1 - 2 Marea bipower wiring diagram (99 range)
506.763/21
(IX/2000) 10
1 - 38 Marea bipower (99 range) fault diagnosis
506.763/21
(IX/2000) 10
60 - 61
Marea bipower (99 range) fuel system
Replacing solenoid valve on methane canister
506.763/23
(IX/2000)
00 1 - 51 2000 range technical data
506.763/23
(IX/2000)
10
1 - 7 Fuel system l^pl i6v 2000 range
506.763/23
(IX/2000)
10
1 - 7 Fuel system l^pt 20v 2000 range 506.763/23
(IX/2000)
50 1 - 4 2000 range climate control
506.763/23
(IX/2000)
55
1 - 18 2000 range electrical equipment
506.763/23
(IX/2000)
55
1 - 141 2000 range wiring diagrams
506.763/24
(XII/2000)
00
15 - 16 2000 range technical data update
506.763/24
(XII/2000)
00
1 - 3 Marengo 2000 range technical data
506.763/24
(XII/2000)
10 1 - 29 Fuel system l^p) JTD 2000 range
506.763/24
(XII/2000)
55 5 - 8
19-52 2000 range electrical equipment update
Copyright by Fiat Auto

Marea - Marea Weekend Summary
TECHNICAL SERVICE MANUAL COMPOSITION
As of December 2000, the Marea-Marea Weekend 4th volume manual is composed of the sections
listed below
Print N° Sections Page
Nos. Notes
506.763/18
(XI/1999)
00 1 - 12 Marea bipower technical data (99 range)
506.763/18
(XI/1999) 10 1 - 59 Marea bipower fuel system (99 range) 506.763/18
(XI/1999)
55 1 - 2 Marea bipower wiring diagram (99 range)
506.763/20
(IV/2000)
00 1 - 15 Marea GPL technical data
506.763/20
(IV/2000) 10 1 - 26 Marea GPL fuel system 506.763/20
(IV/2000)
55 1 - 9 Marea GPL wiring diagram
506.763/21
(IX/2000) 10
1 - 38 Marea bipower fault diagnosis (99 range)
506.763/21
(IX/2000) 10
60 - 61 Marea bipower fuel system (99 range)
Replacing solenoid on methane canister
506.763/23
(IX/2000)
00 1 - 50 2000 range technical data
506.763/23
(IX/2000)
10
1 - 7 2000 range lev fuel system
506.763/23
(IX/2000)
10
1 - 7 2000 range ^||) 20v fuel system 506.763/23
(IX/2000)
50 1-4 2000 range climate control system
506.763/23
(IX/2000)
55
1 - 18 2000 range electrical equipment
506.763/23
(IX/2000)
55
1 - 141 2000 range wiring diagrams
Copyright by Fiat Auto

Marea- Marea Weekend Summary
TECHNICAL SERVICE MANUAL COMPOSITION
At present, September 2000, the Marea-Marea Weekend 4th volume manual is composed of the fol­
lowing booklets
Print N° Sections Page
Nos. Notes
506.763/18
(XI/1999)
00 1 - 12 Technical data on Marea bipower (99 range)
506.763/18
(XI/1999) 10 1 - 59 Marea bipower fuel system (99 range) 506.763/18
(XI/1999)
55 1 - 2
Marea bipower electrical equipment wiring diagrams (99
range)
506.763/20
(IV/2000)
00 1 - 15 Marea GPL technical data
506.763/20
(IV/2000) 10 1 - 26 Marea GPL fuel system 506.763/20
(IV/2000)
55 1 - 9 Marea GPL electrical equipment wiring diagram
506.763/21
(IX/2000) 10
1 - 38 Marea bipower fault diagnosis (99 range)
506.763/21
(IX/2000) 10
60 - 61
Marea bipower fuel system (99 range)
Replacing solenoid valve on methane canister
506.763/23
(IX/2000)
00 1 - 50 Technical data 2000 range
506.763/23
(IX/2000)
10
1 - 7 Fuel system @> 16v 2000 range
506.763/23
(IX/2000)
10
1 - 7 Fuel system l^l 20v 2000 range
506.763/23
(IX/2000)
50 1 - 4 Climate control system 2000 range
506.763/23
(IX/2000)
55
1 - 18 Electrical equipment 2000 range
506.763/23
(IX/2000)
55
1 - 141 Electrical equipment wiring diagrams 2000 range
Copyright by Fiat Auto

Marea-Marea Weekend 9]
2000 range (j§)
I) JTD
Fuel feed system
Engine
10.
Exhaust fumes control
Through this function the injection control unit limits any exhaust fumes that could be produced during
transition speeds.
To satisy these requirements the control unit processes the signals supplied by the accelerator pedal po­
tentiometer, the rpm sensor and the air flow meter and controls the fuel pressure regulator and the injec­
tors to meter the correct amount of fuel to inject.
Exhaust gas recirculation control
On the basis of the signals supplied by the rpm sensor, intake air quantity sensor, engine coolant tempe­
rature sensor and accelerator pedal position sensor, the control unit calculates the operating times for the
EGR valve so that the exhaust gases are partly recirculated in certain engine operating conditions in line
with Euro 3 pollution control standards.
Air conditioning system engagement control
The injection control unit manages the operation of the air conditioning system compressor electro­
magnet coupling following a logic aimed at preventing operating conditions that would adversely affect
engine performance.
- When the compressor is switched on the injection control unit increases the quantity of fuel during
idling to allow the engine to adjust to the increased power requirements and momentarily interrupts the
supply to the compressor in high engine power requirement conditions (strong acceleration).
Engine immobilizer function control
The system is equipped with an engine immobilizer function. This function is achieved through the pre­
sence of a specific control unit (Fiat CODE), capable of conversing with the injection control unit and an
electronic key with a special transmitter for sending a recognition code.
Each time the key is turned to the OFF position, the Fiat CODE system completely deactivates the injecti­
on control unit.
When the key is turned to the ON position the following operations take place, in order:
1. the injection control unit (whose memory contains a secret code) sends the Fiat CODE control unit a
request to send the secret code to deactivate the immobilizer functions;
2. the Fiat CODE control unit responds by only sending the secret code after, in turn, having received the
recognition code transmitted by the ignition key;
3. the recognition of the secret code allows the deactivation of the injection control unit immobilizer func­
tion and its normal operation.
Autodiagnosis
The complete electronic fault diagnosis of the injection system is carried out by connecting the special
equipment (EXAMINER or EXAMINER PLUS) to the standardized diagnostic socket (EOBD).
The system is also equipped with a self-diagnostic function which recognizes, memorizes and signals any
faults.
If a fault is detected in the sensors or actuators, the recovery strategy is immediately activated in order to
ensure that the engine functions at an acceptable level. The vehicle can be driven to a service centre for
the appropriate repairs to be carried out.
Copyright by Fiat Auto 5

Engine Marea- Marea Weekend 9 ™
Fuel feed system 2000 range @
10.
ELECTRONIC INJECTION CONTROL UNIT
The control unit processes signals from the various sensors by applying software algorithms and controls
the actuators accordingly (particularly the injectors and pressure regulator) to achieve the best possible
engine service conditions.
The control unit is "flash E.P.R.O.M." type, i.e. it can be reprogrammed from outside without andy need
to adjust the hardware.
The injection control unit contains a built-in absolute pressure sensor and is connected to the wiring by
means of a 121 pin connector.
Control unit connection identification (PIN-out)
4 5 43 24 6 25 96 106 113 105 119 120 121
1 Earth 25 Not connected
2 Earth 26 Not connected
3 Earth 27 Not connected
4 Actuator power supply 28 Not connected
5 Injector/ECU power supply 29 Not connected
6 Not connected 30 Not connected
7 Not connected 31 Not connected
8 Not connected 32 Not connected
9 Not connected 33 Not connected
10 Not connected 34 Not connected
11 Fiat CODE 35 Not connected
12 Not connected 36 Not connected
13 Injection relay
14 Glow plug control
15 Throttle body solenoid
16 EGR valve
17S VGT solenoid
18 Air conditioner relay
19 Radiator fan high speed relay
20 Radiator fan low speed relay
21 Diagnostic warning light control
22 Glow plug activation control
23 Not connected
24 Auxiliary fuel pump relay
10 Publication no. 506.763/24

Engine
Fuel feed system
10.
1. Pressure rod
2. Pin
3. Nozzle
4. Coil
5. Pilot valve
6. Ball plunger
7. Control area
8. Supply volume
9. Control volume
10. Fuel outlet connector (low pressure)
11. Control port
12. Supply port
13. Electrical connection
14. Fuel input connector (high pressure)
15. Spring
Marea- Marea Weekend 9 ™
2000 range (Q)
INJECTORS
The injectors are fitted to the cylinder head
and are electromagnetic in type. They are
controlled directly by the injection control
unit.
The injectors come with a high-pressure sup­
ply port and a recirculation pipe at environ­
mental pressure; The supply port is connected
to a delivery manifold (rail) with pipes de­
signed to withstand the high service pressures.
The injector can be divided into two parts:
- Actuator/spray made up of a pressure rod
(1), pin (2) and nozzle (3);
- control solenoid made up of coil (4) and
pilot valve (5).
Operation
Injector operation may be divided into three
stages:
1. rest position
Coil (4) is deactivated and plunger (6) is in
closed position to prevent fuel entering the
cylinder: Fc > Fa where Fc is the force gener­
ated by pressure acting on the control area (7)
of pressure rod (1) and Fa is the force due to
the pressure acting on supply volume (8).
2. Start of injection
Coil (4) is excited and causes plunger (6) to
rise. Fuel flows from control volume (9) to
the return manfold to bring about a pressure
drop in control area (7). Simultanteously, line
pressure through supply port (12) exerceses a
force Fa > Fc on supply volume (8) to cause
pin (2) to rise and thus allow fuel into the
cylinders.
3. end of injection
Coil (4) is deactivated and causes plunger (6)
to return to closed position. The resulting bal­
ance of forces makes pin (2) return to rest po­
sition and injection therefore ends.
14 Publication no. 506.763/24

Marea- Marea Weekend <§l ™
2000 range ©
Engine
Fuel feed system
TZZZZZZZZZZZZZZZZZZb
TZZZZZZZZZZZZZZ*
10.
MULTIFUNCTION VALVE
The multifunction valve is located on the fuel
tank and performs the following functions:
- tank pressurisation
- ventilation
- seal if the car rolls over
Tank pressurisation
Tank pressurisation is maintained at a level be­
tween 55 and 75 mbars by means of a valve
mounted on a sealing rim.
The valve is supported by a steel plate and held in place by a spring.
When tank pressure exceeds a specified level, it overcomes spring resistance and allows the valve to rise
so that vapours can flow out.
When the pressure returns to within specified limits, the valve closes again
Ventilation
Under certain car service conditions, a vacuum may build up in the tank due to the effect of:
- heat changes;
- fuel consumption
in this case, the valve's function is to make up pressure inside the tank by letting air into the tank.
If this function is not performed correctly, the car may judder or stall due to difficulties in supplying the
pump.
Seal if the car rolls over
The roll-over function prevents fuel emerging from the tank if the car rolls over or tilts to a great extent.
During normal car operation (bends, acceleration, braking etc.), the fuel slops about and may emerge.
The highly-sensitive roll-over valve prevents this happening.
DELIVERY MANIFOLD (RAIL)
The delivery manifold (rail) is fitted to the cylinder head on the intake side.
Its volume damps fuel pressure fluctuations due mainly to:
- operation of the pressure pump;
- injector opening.
A fuel pressure sensor is fitted in the middle of the delivery manifold.
Hydraulic connections (high pressure) are via special steel pipes.
Copyright by Fiat Auto 21

Marea- Marea Weekend 0 *° Engine
2000 range @ Fuel feed system
10.
EMISSION CONTROL DEVICES
The car is equipped with devices designed to reduce polluting emissions in accordance with Euro 3
reguirements:
- Oxidising catalytic converter (1)
- Exhaust gas recirculation circuit (EGR) (2)
- Crankcase blow-by vapour recirculation circuit (3).
4F027XJ01
OXIDISING CATALYTIC CONVERTER
The oxidising catalytic converter is a post-
treatment device used to oxidise CO, HC and
particulate and convert them to carbon dioxide
(C02) and water vapour (H20).
The catalytic converter consists of a ceramic
honeycomb case (1) with its chambers im­
pregnated with platinum, a substance that
catalyses oxidation reactions.
Exhaust gases flow through the chambers and
heat the catalytic converter where they trigger
the conversion of pollutants to inert com­
pounds.
The chemical reaction involved in oxidising
the CO, HC and particulate is effective at tem­
peratures between 200 °C and 350 °C.
Above 350 °C, the sulphur in the diesel begins
to oxidise to produce sulphur dioxide and sul­
phuric acid.
EXHAUST GAS RECIRCULATION CIRCUIT (EGR)
This system sends a proportion of exhaust gases to the intake under certain engine service conditions.
This dilutes the fuel mixture with inert gsaes to lower.peak temperature in the combustion chamber; This
helps limit the formation of nitrogen oxides (NOx) and reduces exhaust levels by 30-50%.
4F027XJ02
Copyright by Fiat Auto 27