Yamaha Fz1n Service Manual
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Page 351
COOLING SYSTEM 8-27 EAS27300 COOLING SYSTEM EAS27310 CIRCUIT DIAGRAM
Page 352
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)
Page 353
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...
Page 354
COOLING SYSTEM 8-30
Page 355
FUEL INJECTION SYSTEM 8-31 EAS27330 FUEL INJECTION SYSTEM EAS27340 CIRCUIT DIAGRAM
Page 356
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...
Page 357
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...
Page 358
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....
Page 359
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...
Page 360
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.