2001 FIAT MAREA Abs sensor

Marea- Marea Weekend & Engine
2000 range (§) Fuel feed system
ENGINE MANAGEMENT SYSTEM
Foreword
The Marea-Marea Weekend 1998 20v is equipped with a 5 cylinder in line engine with 20 valves, 1998
cc, twin overhead camshaft and a Bosch ME3.1 integrated electronic injection/ignition system.
The fuel system differs from the one described for the 1998 20v "99 range" version through the addition
of several variants to make it compatible with the EEC Stage 3 EOBD regulations.
The main modifications to the system can be summarized as follows:
- Catalytic converter near the exhaust manifold to take maximum advantage of the heat of the gases.
- Two Lambda sensors, one upstream (front) and one downstream (rear) which check the quality of the
exhaust gases and the operation of the catalyzer.
- Adoption of an accelerometre sensor on the right shock absorber turret, used to distinguish between
engine torque variations doe to the uneveness of the road surface and those due to failed ignition in
the combustion chamber (misfire).
- Adoption of a timing sensor on the inlet side timing pulley.
- Multi-purpose valve on the tank to prevent leaks.
- Adoption of raipd attachment connectors for the anti-evaporation system pipes.
- Cap on the fuel filler with an attachment cable.
For further information on the fuel system, refer to publication 507137.
DIAGRAM SHOWING ENGINE EXHAUST ASSEMBLY
4F001WJ01
Key
1. Exhaust manifold
2. Catalytic converter
3. Front Lambda sensor
4. Rear Lambda sensor
5. Silencers
Copyright by Fiat Auto 1

Fuel feed system
Engine Marea- Marea Weekend © ™
2000 range @
10.
The control unit autodiagnostic system checks the signals coming from the sensors and compares them
with the figures allowed:
- signalling faults during starting
- warning light on for 4 seconds indicates test stage
- warning light off after 4 seconds indicates no fault with components that could alter the pollution con­
trol standard figures
- warning light on after 4 seconds indicates fault.
- signalling faults during operation
- warning light on indicates fault
- warning light off indicates no fault with components that could alter the pollution control standard fig­
ures.
- recovery
- from time to time, the control unit defines the type of recovery according to the components which are
faulty
- the recovery parameters are managed by components which are not faulty.
Control of cylinder balancing during idling
According to the signals coming from the sensors, the injection control unit controls the idle speed torque,
altering the injector operating times.
Control of irregular operation
Depending on the signals coming from the sensors, the injection control unit corrects the amount of fuel
to be injected in order to improve driveability and reduce jerking whilst driving.
The correction is achieved through the fuel pressure regulator and by varying the injector operating times.
Control of electrical balance
According to the battery voltage, the injection control unit alters the idle speed, to guarantee a sufficient
current supply from the alternator in situations where the consumers are absorbing a great deal of power.
The variation in the idle speed is achived by regulating the fuel pressure and altering the injector operat­
ing times.
VGT variable geometry turbocharger control (1910 JTD 110 CV)
The injection control unit processes the signal coming from the supercharging sensor, at the various en­
gine operating speeds, and determines the quantity of fuel to be injected, acting on the fuel pressure
regulator and the injector opening times.
In addition, through the solenoid valve, the control unit regulates the geometry of the turbine in order to
ensure optimum performance in all operating conditions.
Turbocharger waste gate valve control (1910 JTD 100 CV)
At the various engine operating speeds, the injection control unit processes the signal coming from the
supercharging sensor and determines the amount of fuel to inject, acting on the fuel pressure regulator
and the injector opening times.
In addition, the control unit controls the opening of the turbocharger waste gate valve, via the solenoid
valve, in order to ensure excellent performance in all operating conditions.
Control of throttle closing when engine is switched off
When the engine is switched off (ignition key in OFF position) the injection control unit closes the throt­
tle valve located on the air intake duct via the special solenoid valve.
This action makes it possible to limit the tiresome shuddering of the engine whilst it is switching off.
6 .i. V!-01-.Cancelftand replaces Print n° 506.763/25

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.
4F012XJ03
Marea- Matea Weekend 9 ™
2000 range (Q)
RPM SENSOR
The rpm sensor is fitted to the engine crank-
case and faces the phonic wheel on the
crankshaft.
The sensor is inductive type, i.e. it works by
varying a magnetic field generated when the
phonic wheel teeth (60-2 teeth) pass in front
of the sensor element.
The injection control unit uses the rpm sensor
signal to determine crankshaft speed and an­
gular position.
Operation
The changeover from full to empty due to the
presence or absence of teeth sets up a mag­
netic flux change sufficient to generate an in­
duced alternating voltage proportional to the
number of teeth on the phonic wheel.
The peak sensor output voltage value, all
things being equal, depends on the distance
between the sensor and the tooth (gap).
1. Steel bush
2. Permanent magnet
3. Sensor case
4. Winding
5. Core
6. Phonic wheel
7. Electrical connection
To obtain the correct signal, the specified gap
between phonic wheel and sensor should be
between 0.8 and 1.5 mm
This distance is not adjustable. When the gap
is not as specified, check the condition of the
sensor and phonic wheel.
Winding resistance
860 Ohm ±110% at 20 °C
1. Maximum magnetic flux
2. Minimum magnetic flux
3. Induced alternate voltage
12 Publication no, 506.763/24

Electrical equipment
Component location
Marea-Marea Weekend
2000 range ©
55.
ANTI-LOCKING BRAKING SYSTEM (ABS) AND FAILURE WARNING LIGHT
Component key
3 Power fusebox
4 Junction unit:
6 Instrument panel
8 Left front earth
10 Engine battery earth
11 Battery
12 Ignition switch
40 Brake lights control switch
88 Insufficient brake fluid level sensor
95 Connection between front cables/anti-
lock brakes A.B.S.
96 60A fuse protecting anti-lock brakes (A.B.S.)
174 Power earth for A.B.S.
176 Diagnostic socket for A.B.S.
177 Sensor on left front wheel (A.B.S.)
178 Sensor on left rear wheel (AB.S.)
179 Sensor on right front wheel (AB.S.)
180 Sensor on right rear wheel (AB.S.)
181 Electro-hydraulic control unit
375 Standardized diagnostic socket
3A Power fusebox
*CA95 CB n.d.
R n.d.
M n.d.
X n.d
.VN127
AR n.d.
.C n.d.
C n.d M n.d.
95 Connection between front cables/anti-lock brakes A.B.S. leads
LN 375
BN n.d.
*CA3A
BN 181
*CN 181
1 81 A.B.S. hydraulic control unit
9 M 180* 18 N n.d. *
10 V180* 19 R n.d. *
11 LN 95 20 RV95*
12 M 179* 21 BN 95*
13 B 179* 22 M 178*
14 M 177* 23 G 178*
15 C95* 24 LR 95*
16 N n.d. * 25 R 177*
17 Rn.d.*
4FQ68ML04
The cables involved in the wiring diagram are marked with an asterisk.
68 Print n° 506.763/23

Marea- Marea Weekend
2000 range ©
Electrical equipment
Connector blocks
1 79 Sensor on right front wheel (A.B.S.)
B 181
M 181
1 81 ABS hydraulic control unit
10
11
12
13
14
15
16
17
M 180
V 180
LN 95
M179
B 179
M177
C95
N n.d.
Rn.d.
18
19
20
21
22
23
24
25
N n.d.
Rn.d.
RV95
BN 95
M 178
G 178
LR 95
R177
182A Right brake pad wear sensor cable con­
nection
BR 13
55.
1 80 Sensor on right rear wheel (A.B.S.)
V181
M 181
1 84 Ignition coil (2°)
1998
M 148
183 Ignition coil (1°)
1998
M 148
Gn.d.
G 190B
1 85 Ignition coil (3°)
1998
M 148
Copyright by Fiat Auto 117