Yamaha Fz6n Manual
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7-28 THROTTLE BODIESFI CAUTION: CAUTION: EAS00911 The throttle bodies should not be disas- sembled. EAS00912 CHECKING THE INJECTORS 1. Check: injectors Damage Replace. EAS00913 CHECKING THE THROTTLE BODIES 1. Check: throttle bodies Cracks / damage Replace the throttle bo- dies as a set. 2. Check: fuel passages Obstructions Clean. a. Wash the throttle bodies in a petroleum- based solvent. Do not use any caustic carburetor cleaning solution. b. Blow out all of the passages with com- pressed air. fuel pulsation damper Do not adjust the fuel pulsation damper.
7-29 THROTTLE BODIESFI CHECKING THE FUEL PUMP AND PRESSURE REGULATOR OPERATION 1. Check: fuel pump operation Refer to “FUEL TANK” in chapter 3. a. Remove the seat fuel tank. Refer to “SEAT AND FUEL TANK” in chapter 3. b. Connect the pressure gauge 1 and adapter 2 onto the fuel injection pipe. Pressure gauge 90890-03153, YU-03153 Adapter 90890-03176, YM-03176 c. Install the fuel tank. Refer to “FUEL TANK” in chapter 3. d. Start the engine. e. Measure the fuel pressure. Fuel pressure 250 kPa (2.5 kg / cm 2, 36.3 psi) Faulty Replace the fuel pump assembly.
7-30 THROTTLE BODIESFI NOTE: EAS00916 CHECKING AND ADJUSTING THE THROTTLE POSITION SENSOR Before adjusting the throttle position sensor, the engine idling speed should be properly ad- justed. 1. Check: throttle position sensor a. Disconnect the throttle position sensor cou- pler. b. Remove the throttle position sensor from the throttle body. c. Connect the pocket tester (Ω 1k) to the throttle position sensor. Positive tester probe blue terminal 1 Negative tester probe black / blue terminal 2 d. Measure the maximum throttle position sen- sor resistance. Out of specification Replace the throttle position sensor. Maximum throttle position sensor resistance 3.5 6.5 kΩ at 20C (68F) (blue - black / blue) e. Connect the pocket tester (Ω 1k) to the throttle position sensor. Positive tester probe yellow terminal 3 Negative tester probe black / blue terminal 2
7-31 THROTTLE BODIESFI NOTE: Tester positive probe yellow terminal Tester negative probe black / blue terminal 1 2 f. While slowly opening the throttle, check that the throttle position sensor resistance is with- in the specified range. The resistance does not change or it changes abruptly Replace the throttle position sensor. The slot is worn or broken Replace the throttle position sensor. Check mainly that the resistance changes grad- ually when turning the throttle, since the read- ings (from closed to wide-open throttle) may dif- fer slightly from those specified. Throttle position sensor resistance 0 5 1.5 kΩ at 20C (68F) (yellow – black / blue) 2. Adjust: throttle position sensor angle a. Connect the throttle position sensor coupler to the wire harness. b. Connect the digital circuit tester to the throttle position sensor. Digital circuit tester 90890-03174 c. Measure the throttle position sensor voltage. d. Adjust the throttle position sensor angle so the measured voltage is within the specified range. Throttle position sensor voltage 0.63 0.73 V (yellow – black / blue) g. After adjusting the throttle position sensor angle, tighten the throttle position sensor screws.
7-32 AIR INDUCTION SYSTEMFI EAS00507 AIR INDUCTION SYSTEM AIR INJECTION The air induction system burns unburned ex- haust gases by injecting fresh air (secondary air) into the exhaust port, reducing the emission of hydrocarbons. When there is negative pressure at the exhaust port, the reed valve opens, allowing secondary air to flow into the exhaust port. The required temperature for burning the unburned exhaust gases is approximately 600 to 700C (1112 to 1292F). EAS0097 AIR CUT-OFF VALVE The air cut-off valve is controlled by the signals from the ECU in accordance with the combus- tion conditions. Ordinarily, the air cut-off valve opens to allow the air to flow during idle and closes to cut-off the flow when the motorcycle is being driven. However, if the coolant tempera- ture is below the specified value, the air cut-off valve remains open and allows the air to flow into the exhaust pipe until the temperature be- comes higher than the specified value. AFrom the air cleaner BTo the cylinder head
7-33 AIR INDUCTION SYSTEMFI A To cylinder #1 and #2 B To cylinder #3 and #41 Air cut-off valve 2 Reed valve 3 To air filter case EAS00509 AIR INDUCTION SYSTEM DIAGRAMS
7-34 AIR INDUCTION SYSTEMFI EAS00510 CHECKING THE AIR INDUCTION SYSTEM 1. Check: hoses Loose connection Connect properly. Cracks / damage Replace. pipes Cracks / damage Replace. 2. Check: reed valve 1 reed valve stopper reed valve seat Cracks / damage Replace the reed valve. 3. Measure: reed valve bending limit a Out of specification Replace the reed valve. Reed valve bending limit 0.4 mm (0.016 in) 1Surface plate 4. Check: air cut-off valve Cracks / damage Replace.
7-35 AIR INDUCTION SYSTEMFI 5. Check AI system solenoid a. Remove the AI system solenoid coupler from the wire harness. b. Connect the pocket tester (Ω 1) to the AI system solenoid terminal as shown. Tester positive probe brown / red 1 Tester negative probe red / white 2 c. Measure the AI system solenoid resistance. AI system solenoid resistance 18 22 Ω at 20C (68F) d. Out of specification Replace.
8-1 8 ELECTRICAL COMPONENTSELEC 9Oil level switch 10Radiator fan motor 11Horn 12Ignition coil 1Main switch 2Front brake light switch 3Starter relay 4Battery 5Fuse box 6Rear brake light switch 7Neutral switch 8Sidestand switch EAS00729 ELECTRICAL SYSTEM ELECTRICAL COMPONENTS
8-2 9Radiator fan motor relay 10Turn signal relay 11Rectifier / regulator 12Throttle position sensor 1Coolant temperature sensor 2Intake air temperature sensor 3Intake air pressure sensor 4Fuel pump 5ECU 6Lean angle cut-off switch 7Starting circuit cut-off relay 8Dimmer relay ELECTRICAL COMPONENTSELEC