
Marea-Marea Weekend®>*»
99 range
Engine
Index
page
BOSCH ME 3.1.4 MOTRONIC
M.P.I. INTEGRATED INJEC-
TION/IGNITION SYSTEM
1
Introduction 1
General description of the injection
system 1
General description of the ignition
system 1
Injection/ignition system functional
diagram 2
System functions 3
SYSTEM MANAGEMENT STRATE-
GIES
4
Adjustment of the injection times 4
Ignition advance adjustments 4
Controlling the cold starting 4
Controlling the enrichment of the
mixture during acceleration 4
Fuel cut-off during overrun 4
Engine idle speed control 5
Restricting the maximum number of
revs (protection outside of revs) 5
Controlling combustion via the
Lambda sensor 5
Fuel vapour recovery 6
Detonation control 6
- Phase transformer control 6
Inlet manifold control 6
System self-adjustment 7
- Autodiagnosis 7
Management
of
the radiator fan 8
Management
of
the radiator fan 8
AIR INTAKE CIRCUIT
8
DIAGRAM SHOWING INFORMA-
TION ENTERING/LEAVING THE
CONTROL UNIT AND SEN-
SORS/ACTUATORS
9
FUEL SUPPLY CIRCUIT DIAGRAM
10
FUEL ANTI-EVAPORATION CIR-
CUIT DIAGRAM
11
RECIRCULATION SYSTEM FOR
GASES COMING FROM THE
CYLINDER BLOCK/CRANKCASE
(BLOW-BY)
12
ENGINE EXHAUST ASSEMBLY Dl-
AGARM
13
INJECTION/IGNITION SYSTEM
WIRING DIAGRAM
14
Control unit/ignition coils and in-
jectors connection 15
LOCATION OF INJECTION / IGNI-
TION SYSTEM COM PON ENTS
16
10.
page
FUSES AND RELAYS
17
DIAGNOSTIC SOCKET
18
INJECTION/IGNITION SYSTEM
COMPONENTS
18
Injection/ignition system wiring 18
Injection/ignition electronic control
unit 18
Ignition coils 21
Timing sensor 22
Engine rpm and TDC sensor 23
Detonation sensors 24
Electric fuel pump 25
Fuel supply manifold 25
Injectors 26
- Accelerator pedal potentiometer 27
Brake pedal switch 27
- Clutch pedal switch 27
- Air flow meter 28
Butterfly casing actuator 29
Lambda sensor 30
Speedometer sensor 31
Phase transformer 32
Engine coolant temperature sensor 34
Inertia switch 35
ANTI-EVAPORATION SYSTEM
COMPONENTS
36
Fuel vapour cut out solenoid and
charcoal filter 36
CHECKS, ADJUSTMENTS AND RE-
PAIR OPERATIONS FOR THE
BOSCH ME
3.1
MOTRONIC INJEC-
TION/IGNITION SYSTEM IN ADDI-
TION TO THE FAULT DIAGNOSIS
37
Engine idle speed check 38
Checking concentration of pollutant
emissions 38
DIAGNOSTICS
40
Detecting faults 40
Memorizing the error and structure
of the errors memory 40
Classification of the defect 40
Frequency counter 40
Failure signalling 40
Error cancelling 41
Connectin with diagnostic equip-
ment 41
List of errors 41
Parameters displayed 42
- Active diagnosis 42
Recovery 42
Permanent memory 42
Copyright by Fiat Auto
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