Index - PIAGGIO 500 cc Service Manual

Fuel injection
INTRODUCTION ................................................................................................................... 9-3
PRECAUTIONS .................................................................................................................... 9-5
TROUBLESHOOTING. ......................................................................................................... 9-6
COMPONENTS LAYOUT ..................................................................................................... 9-7
LAYOUT OF THE EMS CONTROL UNIT TERMINALS AND IMMOBILIZER ....................... 9-8
EMS SYSTEM DIAGRAM ..................................................................................................... 9-9
FAULT SEARCH PROCEDURES ....................................................................................... 9-10
IMMOBILIZER SYSTEM ..................................................................................................... 9-16
Non programmed system ................................................................................................ 9-17
SYstem programming ..................................................................................................... 9-18
Diagnostic codes............................................................................................................. 9-20
Diagnostics guide of anomalies not revealed through self-diagnostics .......................... 9-23
FEED CIRCUIT OF THE DECODER AND THE FUEL INJECTION CONTROL UNIT ....... 9-27
Constant feed circuit control ........................................................................................... 9-27
Feed circuit control derived from the key switch ............................................................. 9-30
DIAGNOSIS TESTER LINK CIRCUIT ................................................................................ 9-34
FUEL INJECTION INDICATOR CIRCUIT ........................................................................... 9-36
SELF-DIAGNOSIS SYSTEM .............................................................................................. 9-38
FUEL SUPPLY SYSTEM .................................................................................................... 9-39
General details ................................................................................................................ 9-39
Pump feed circuit ............................................................................................................ 9-40
Circuit control .................................................................................................................. 9-41
Hydraulics control and system maintenance .................................................................. 9-46
Pressure regulator control............................................................................................... 9-47
Fuel filter and pump control ............................................................................................ 9-49
Pump electrical controls .................................................................................................. 9-53
Pump support overhaul ................................................................................................... 9-54
Injector circuit control ...................................................................................................... 9-58
Injector hydraulics control ............................................................................................... 9-62
REVOLUTIONS SENSOR .................................................................................................. 9-64
H.V. COIL ............................................................................................................................ 9-68
IGNITION TIMING ............................................................................................................... 9-72
COOLANT TEMPERATURE SENSOR ............................................................................... 9-74
AIR INTAKE TEMPERATURE SENSOR ............................................................................ 9-78
PRESSURE SENSOR ........................................................................................................ 9-82
T.P.S.=THROTTLE POSITION SENSOR ............................................................................ 9-83
T.P.S. RESET ...................................................................................................................... 9-87
STEPPER MOTOR ............................................................................................................. 9-89
IDLING CARBURATION REGULATION ............................................................................ 9-95
CATALYST EFFICIENCY .................................................................................................... 9-98
ELECTRICAL FAN COMMAND CIRCUIT ........................................................................... 9-99
REVOLUTIONS COUNTER COMMAND CIRCUIT .......................................................... 9-104
9 - 2

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