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