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- 120 -

Pin definition ..................................................................................................................................... - 167 -

Position .............................................................................................................................................. - 167 -

Cleaning ............................................................................................................................................. - 167 -

Fault Determination ........................................................................................................................... - 167 -

Oxygen Sensor ........................................................................................................................................... - 168 -

Working Principle of Oxygen Sensor ................................................................................................ - 168 -

Appearance of Oxygen Sensor .......................................................................................................... - 168 -

Technical Parameters ......................................................................................................................... - 168 -

Installation Requirements .................................................................................................................. - 168 -

Oxygen Sensor Pin Definition: .......................................................................................................... - 169 -

Fault Determination ........................................................................................................................... - 169 -

Characteristic curve ........................................................................................................................... - 170 -

Requirements for Fuel Quality .......................................................................................................... - 170 -

Temperature Sensor of Engine Cylinder Head .......................................................................................... - 171 -

Working Principle of Temperature Sensor of Engine Cylinder Head ................................................ - 171 -

Appearance of Temperature Sensor of Engine Cylinder Head .......................................................... - 171 -

Working Environment ........................................................................................................................ - 171 -

Electrical environment ....................................................................................................................... - 171 -

Fault Determination and Characteristic of Output Resistance ........................................................... - 172 -

Canister Solenoid Valve (ECP) .................................................................................................................. - 173 -

Overview of Working Principles........................................................................................................ - 173 -

Appearance ........................................................................................................................................ - 173 -

ECP Pin .............................................................................................................................................. - 173 -

Technical Parameters ......................................................................................................................... - 174 -

Installation Requirements .................................................................................................................. - 174 -

Ignition Coil ............................................................................................................................................... - 175 -

Appearance of Ignition Coil .............................................................................................................. - 175 -

Fault Description: .............................................................................................................................. - 175 -

Fault Maintenance Diagnosis Method of EFI System ............................................................................... - 176 -

Diagnosis Directly Using the Flashing Fault Lamp at Instrument ..................................................... - 176 -

Diagnosing Fault Using Diagnostic Apparatus .................................................................................. - 179 -

Common Troubleshooting Methods of Electronic Fuel Injection System ................................................. - 181 -

Maintenance Tool .............................................................................................................................. - 18

1 -

Engine Working Data Flow Displayed by Diagnostic Apparatus ...................................................... - 18

2 -

Step I .......................................................................................................................................... - 182 -

Step II ......................................................................................................................................... - 182 -

Step III ....................................................................................................................................... - 182 -

Simple Troubleshooting ..................................................................................................................... - 184 -

Daily Use an

d Maintenance ....................................................................................................... - 184 -

Fault phenomenon-Start fault .................................................................................................... - 185 -

Fault phenomenon—Start failure with tempering...................................................................... - 187 -

Fault phenomenon—Instable idle sp

eed .................................................................................... - 187 -

Fault phenomenon—Too high or too low idle speed (idle speed is obviously inconsistent with

target idle sp

eed) ........................................................................................................................ - 188 -

Fault phenomenon—Instable idle speed with deceleration and flameout .................................. - 189 -

Fault phenomenon—Insufficient power of deceleration ............................................................ - 189 -

Displacement	125 cc
Transmission	5-speed
Fuel System	EFI
Fuel Capacity	7.2 liters
Seat Height	780 mm
Dry Weight	116 kg
Bore x Stroke	54 mm x 54.5 mm
Starting System	Electric
Wheelbase	1215 mm
Engine Type	Single cylinder, 4-stroke, air-cooled
Front Suspension	Upside-down fork
Front Brake	Single disc
Rear Brake	Single disc
Front Tire	120/70-12
Rear Tire	130/70-12
Max Power	8.2 kW (11.1 Cv) @ 9500 rpm
Rear Suspension	Swing arm with lateral shock absorber with adjustable spring preload

Benelli TNT125 Service Manual

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Benelli TNT125 Specifications

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