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14. DOWNTOWN 125 i FUEL SYSTEM (Auto Control Fuel Injection System)
SERVICE INFORMATION
GENERAL INSTRUCTIONS
Gasoline is very dangerous. When working with gasoline, keep sparks and flames away
from the working area.
Gasoline is extremely flammable and is explosive under certain conditions. Be sure to
work in a well-ventilated area.
· Disconnect the cables of the battery when the engine is running, which could lead to ECU
damage.
· Connect the harness positive (+) cable to the battery negative (-) terminal or connect the harness
negative (-) to the battery positive (+) terminal, which could lead to ECU damage.
· Always keep fuel over 750 cc in fuel tank.
SPECIFICATIONS
Item Standard
Charging voltage of battery 13.5~14.5V
Voltage from the ECU to sensor 50.1V
Fuel injector resistance (20°C/68°F) 10.6~15.9
Water temperature sensor resistance 2.07510 K (20~30°C)
Throttle position sensor voltage Idle (0°)=0.230.05V
Throttle fully (90° /3.27V over)
Fuel pump resistance (20°C/68°F) F: about 1100 E: about 100
O2 sensor heater resistance 6.7~9.5
O2 sensor Air/Fuel<14.7 (Rich) >0.7V
Voltage
Air/Fuel>14.7 (Lean) <0.18V
Item Standard
Crank position sensor (Pulser) resistance 95~144
(20°C/68°F)
Inductive ignition coil resistance (20°C/68°F) 0.55~0.75
Roll sensor voltage (diagnostics) Normal: 0.3~1.4V
Over 65° fall down: 3.5~4.7V
Idle speed 1850100 rpm
14-3