Yamaha Fz1n Service Manual
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COOLING SYSTEM 8-27 EAS27300 COOLING SYSTEM EAS27310 CIRCUIT DIAGRAM
COOLING SYSTEM 8-28 1. Main switch 6. Fuse (main) 7. Battery 23.ECU 38.Coolant temperature sensor 78.Fuse (ignition) 82.Radiator fan motor relay 83.Fuse (radiator fan motor left) 84.Fuse (radiator fan motor right) 85.Radiator fan motor (left) 86.Radiator fan motor (right)
COOLING SYSTEM 8-29 EAS27320 TROUBLESHOOTING NOTE: Before troubleshooting, remove the following part(s): 1 Rider and passenger seat 2 Fuel tank 3 Air filter caseNG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ 1 Check the fuses. (Main, ignition and radiator fan motor) Refer to CHECKING THE FUSES on page 8-97. Replace the fuse(s). 2 Check the battery. Refer to CHECKING AND CHARGING THE BATTERY on page 8-97. Clean the battery terminals. Recharge or replace the battery. 3 Check the main switch. Refer to CHECKING THE SWITCHES on page 8-93. Replace the immobilizer kit. 4 Check the radiator fan motor (left and right). Refer to CHECKING THE RADIA- TOR FAN MOTOR on page 8-108. The radiator fan motor is faulty and must be replaced. 5 Check the radiator fan motor relay. Refer to CHECKING THE RELAYS on page 8-100. Replace the radiator fan motor relay. 6 Check the coolant temperature. Refer to CHECKING THE COOL- ANT TEMPERATURE SENSOR on page 8-108. Replace the coolant temperature sen- sor. 7 Check the entire cooling system’s wiring. Refer to CIRCUIT DIAGRAM on page 8-27. Properly connect or repair the cooling system’s wiring. This circuit is OK.
FUEL INJECTION SYSTEM 8-31 EAS27330 FUEL INJECTION SYSTEM EAS27340 CIRCUIT DIAGRAM
FUEL INJECTION SYSTEM 8-32 1. Main switch 4. Fuse (backup) 6. Fuse (main) 7. Battery 8. Fuse (fuel injection) 11.Relay unit 12.Starting circuit cut-off relay 13.Fuel pump relay 14.Neutral switch 15.Sidestand switch 16.Fuel pump 17.Crankshaft position sensor 18.Cylinder identification sensor 19.Speed sensor 20.Atmospheric pressure sensor 21.Lean angle sensor 22.O 2 sensor 23.ECU 24.Ignition coil #1 25.Ignition coil #2 26.Ignition coil #3 27.Ignition coil #4 28.Spark plug 29.Injector #1 30.Injector #2 31.Injector #3 32.Injector #4 34.Sub-throttle position sensor 35.EXUP servo motor 36.Intake air pressure sensor 37.Throttle position sensor 38.Coolant temperature sensor 39.Air temperature sensor 46.Multi function meter 56.Engine stop switch 78.Fuse (ignition)
FUEL INJECTION SYSTEM 8-33 EAS27370 TROUBLESHOOTING The ignition system fails to operate (no spark or intermittent spark). NOTE: Before troubleshooting, remove the following part(s): 1 Rider and passenger seat 2 Fuel tank 3 Air filter caseNG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ 1 Check the fuses. (Main, backup, fuel injection and ignition) Refer to CHECKING THE FUSES on page 8-97. Replace the fuse(s). 2 Check the battery. Refer to CHECKING AND CHARGING THE BATTERY on page 8-97. Clean the battery terminals. Recharge or replace the battery. 3 Check the spark plugs. Refer to CHECKING THE SPARK PLUGS on page 3-10. Re-gap or replace the spark plugs. 4 Check the ignition coils. Refer to CHECKING THE IGNI- TION COILS on page 8-103. Replace the ignition coils. 5 Check the crankshaft position sen- sor. Refer to CHECKING THE CRANKSHAFT POSITION SEN- SOR on page 8-104. Replace the crankshaft position sen- sor. 6 Check the relay unit (fuel pump relay). Refer to CHECKING THE RELAYS on page 8-100. Replace the relay unit. 7 Check the fuel pump. Refer to CHECKING THE SWITCHES on page 8-93. Replace the fuel pump.
FUEL INJECTION SYSTEM 8-34 NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ 8 Check the main switch. Refer to CHECKING THE SWITCHES on page 8-93. Replace the immobilizer kit. 9 Check the engine stop switch. Refer to CHECKING THE SWITCHES on page 8-93. Replace the right handlebar switch. 10 Check the neutral switch. Refer to CHECKING THE SWITCHES on page 8-93. Replace the neutral switch. 11 Check the sidestand switch. Refer to CHECKING THE SWITCHES on page 8-93. Replace the sidestand switch. 12 Check the clutch switch. Refer to CHECKING THE SWITCHES on page 8-93. Replace the clutch switch. 13 Check the relay unit (starting circuit cut-off relay). Refer to CHECKING THE RELAYS on page 8-100. Replace the relay unit. 14 Check the lean angle sensor. Refer to CHECKING THE LEAN ANGLE SENSOR on page 8-105. Replace the lean angle sensor. 15 Check the cylinder identificatin sen- sor. Refer to CHECKING THE CYLIN- DER IDENTIFICATION SENSOR on page 8-111. Reeplace the cylinder identification sensor. 16 Check the speed sensor. Refer to CHECKING THE SPEED SENSOR on page 8-107. Replace the spped sensor.
FUEL INJECTION SYSTEM 8-35 NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ NG→ OK ↓ 17 Checking the aomospheric pres- sure sensor. Refer to CHECKING THE ATMO- SPHERIC PRESSURE SENSOR on page 8-111. Replace the atomospheric pressure sensor. 18 Check the injector. Refer to CHECKING THE INJEC- TORS on page 7-8. Replace the injector. 19 Check the throttle position sensor. Refer to CHECKING THE THROT- TLE POSITION SENSOR on page 8-109. Replace the throttle position sensor. 20 Check the sub-throttle position sen- sor. Refer to CHECKING THE SUB- THROTTLE POSITION SENSOR on page 8-110. Replace the sub-throttle position sen- sor. 21 Check the intake air pressure sen- sor. Refer to CHECKING THE INTAKE AIR PRESSURE SENSOR on page 8-112. Replace the intake air pressure sensor 22 Check the coolant temperature sensor. Refer to CHECKING THE COOL- ANT TEMPERATURE SENSOR on page 8-108. Replace the coolant temperature sen- sor. 23 Check the inatke air temperature sensor. Refer to CHECKING THE INTAKE AIR TEMPERATURE SENSOR on page 8-112. Replace the intake air temperature sensor.
FUEL INJECTION SYSTEM 8-36 NG→ OK ↓ 24 Check the entire ignition system’s wiring. Refer to CIRCUIT DIAGRAM on page 8-1. Properly connect or repair the ignition system’s wiring Replace the ECU.