Yamaha Fz1n Service Manual
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FUEL INJECTION SYSTEM 8-47 09Fuel system voltage (battery voltage) Approximately 12.0 Set the engine stop switch to “ ” and then compare with the actually measured battery voltage. (If the bat- tery voltage is lower, recharge the battery.) 20 Sidestand switch Set ON/OFF the sidestand switch (with the transmis- sion in gear). Stand retracted ON Stand extended OFF 21 Neutral switch Set ON/OFF the neutral switch (shift the transmis- sion). Neutral ON In gear OFF 60 EEPROM fault cylinder No No fault Fault detected 00 01–04 (fault cylinder No.) (If more than one cylinder is defective, the display changes every two seconds to show all the detected cyl- inder numbers. When all cylinder numbers are shown, the display repeats.) — 61 Malfunction history code — No history 00 History exists Fault codes 11–50 (If more than one code number is detected, the dis- play changes every two seconds to show all the detected code numbers. When all code numbers are shown, the display repeats.) 62 Malfunction history code erasure No history 00 — History exists Fault codes 01-28 (If more than one code number is detected, the dis- play alternates every two seconds to show all the detected code numbers. When all code numbers are shown, the display repeats the same process.) To erase the history, set the engine stop switch to “ “ . Diag- nostic code No. Item Meter display Checking method
FUEL INJECTION SYSTEM 8-48 Actuator operation table63 Malfunction code reinstate No mulfunction code 00 — Malfunction code exists Fault code 24 (If more than one code number is detected, the dis- play changes every two seconds to show all the detected code numbers. When all code numbers are shown, the display repeats.) To reinstate, set the engine stop switch to “ “ . 70 Control number 0–255 — Diag- nostic code No. Item Actuation Checking method 30 Cylinder-#1 ignition coil Actuates the cylinder-#1 igni- tion coil five times at one sec- ond intervals. Illuminates the engine trou- ble warning light. Check the spark five times. Connect an ignition checker. 31 Cylinder-#2 ignition coil Actuates the cylinder-#2 igni- tion coil five times at one-sec- ond intervals. Illuminates the engine trou- ble warning light. Check the spark five times. Connect an ignition checker. 32 Cylinder-#3 ignition coil Actuates the cylinder-#3 igni- tion coil five times at one-sec- ond intervals. Illuminates the engine trou- ble warning light. Check the spark five times. Connect an ignition checker. 33 Cylinder-#4 ignition coil Actuates the cylinder-#4 igni- tion coil five times at one-sec- ond intervals. Illuminates the engine trou- ble warning light. Check the spark five times. Connect an ignition checker. 36 Injector #1 Actuates the injector #1 five times at one-second inter- vals. Illuminates the engine trou- ble warning light. Check the operating sound of the injector #1 five times. 37 Injector #2 Actuates the injector #2 five times at one-second inter- vals. Illuminates the engine trou- ble warning light. Check the operating sound of the injector #2 five times. Diag- nostic code No. Item Meter display Checking method
FUEL INJECTION SYSTEM 8-49 38Injector #3 Actuates the injector #3 five times at one-second inter- vals. Illuminates the engine trou- ble warning light. Check the operating sound of the injector #3 five times. 39 Injector #4 Actuates the injector #4 five times at one-second inter- vals. Illuminates the engine trou- ble warning light. Check the operating sound of the injector #4 five times. 48 Air induction system sole- noid Actuates the Air induction system solenoid five times at one-second intervals. Illuminates the engine trou- ble warning light. Check the operating sound of the Air induction system solenoid five times. 50 Fuel injection system relay Actuates the fuel injection system relay five times at one-second intervals. Illuminates the engine trou- ble warning light. (The engine trouble warning light is OFF when the relay is ON, and the engine trouble warning light is ON when the relay is OFF). Check the operating sound of the fuel injection system relay five times. 51 Radiator fan motor relay Actuates the radiator fan motor relay five times at one- second intervals. (ON 2 sec- onds, OFF 3 seconds) Illuminates the engine trou- ble warning light. Check the operating sound of the Radiator fan motor relay five times. 52 Headlight relay Actuates the headlight relay for five times every five-sec- ond. (ON 2 seconds, OFF 3 seconds) Illuminates the engine trou- ble warning light. Check the operating sound of the headlight relay five times. 53 Exup servo motor Actuate the servo motor turns to close side and to open side. Illuminates the engine trou- ble warning light only while the motor is runnning. Check the operating sound of the EXUP servo motor. Diag- nostic code No. Item Actuation Checking method
FUEL INJECTION SYSTEM 8-50 EAS27460 TROUBLESHOOTING DETAILS This section describes the measures per fault code number displayed on the meter. Check and ser- vice the items or components that are the probable cause of the malfunction following the order given. After the check and service of the malfunctioning part has been completed, reset the meter display according to the reinstatement method. Fault code No.: Code number displayed on the meter when the engine failed to work normally. Refer to Self-Diag- nostic Function table. Diagnostic code No.: Diagnostic code number to be used when the diagno stic mode is operated. Refer to DIAGNOSTIC MODE on page 8-42. 56 Sub-throttle servo motor Actuate the servo motor turns to close side and to open side. Illuminates the engine trou- ble warning light only while the motor is runnning. Check the operating sound of the Sub-throttle servo motor. Fault code No. 11 Symptom No normal signals are received from the cylinder identifi- cation sensor when the engine is started or while the vehicle is being driven. Diagnostic code No. — — Orde r Item/components and probable cause Check or maintenance job Reinstatement method 1 Installed condition of cylinder identifi- cation sensor. Check for looseness or pinching. Starting the engine and operate it at idle. 2 Connections Cylinder identification sensor cou- pler Main wire harness ECU coupler Sub-wire harness coupler Check the coupler for any pins that may be pulled out. Check the locking condition of the couplers. If there is a malfunction, repair it and connect the coupler securely. 3 Open or short circuit in wire harness. Repair or replace if there is an open or short circuit. Between the cylinder identifica- tion sensor coupler and ECU coupler (Blue–Blue) (White/Black–White/Black) (Black/Blue–Black/Blue) 4 Defective cylinder identification sen- sor. Replace if defective. Refer to CHECKING THE CYLINDER IDENTIFICATION SENSOR on page 8-111. Diag- nostic code No. Item Actuation Checking method
FUEL INJECTION SYSTEM 8-51 Fault code No. 12 SymptomNo normal signals are received from the crankshaft posi- tion sensor. Diagnostic code No. — — Orde r Item/components and probable cause Check or maintenance job Reinstatement method 1 Installed condition of crankshaft posi- tion sensor Check for looseness or pinching. Cranking the engine. 2 Connections Crankshaft position sensor coupler Main wire harness ECU coupler Check the couplers for any pins that may have pulled out. Check the locking condition of the couplers. If there is a malfunction, repair it and connect the coupler securely. 3 Open or short circuit in wire harness. Repair or replace if there is an open or short circuit. Between the crankshaft position sensor coupler and ECU cou- pler. (Gray–Gray) (Black/Blue–Black/Blue) 4 Defective crankshaft position sensor. Replace if defective. Refer to CHECKING THE CRANKSHAFT POSITION SENSOR on page 8-104.
FUEL INJECTION SYSTEM 8-52 Fault code No. 13 Symptom Intake air pressure sensor:open or short circuit detected. Diagnostic code No. 03 Intake air pressure sensor Orde r Item/components and probable cause Check or maintenance job Reinstatement method 1 Connections Intake air pressure sensor coupler Main wire harness ECU coupler Sub-wire harness coupler Check the couplers for any pins that may have pulled out. Check the locking condition of the couplers. If there is a malfunction, repair it and connect the coupler securely. Turn the main switch to ON. 2 Open or short circuit in wire harness and/or sub wire harness. Repair or replace if there is an open or short circuit. Between intake air pressure sensor coupler and ECU cou- pler (Black/Blue–Black/Blue) (Pink/White–Pink/White) (Blue–Blue) 3 Defective intake air pressure sensor Execute the diagnostic mode. (Code No.03) Replace if defective. Refer to CHECKING THE INTAKE AIR PRESSURE SEN- SOR on page 8-112. Fault code No. 14 Symptom Intake air pressure sensor: faulty intake air pressure sen- sor system. Diagnostic code No. 03 Intake air pressure sensor Orde r Item/components and probable cause Check or maintenance job Reinstatement method 1 Intake air pressure sensor hose Check the intake air pressure sensor hose condition. Repair or replace the sensor hose. Starting the engine and operate it at idle. 2 Connections Intake air pressure sensor coupler Main wire harness ECU coupler Check the couplers for any pins that may be pulled out. Check the locking condition of the couplers. If there is a malfunction, repair it and connect the coupler securely. 3 Defective intake air pressure sensor Execute the diagnostic mode. (Code No.03) Replace if defective. Refer to CHECKING THE INTAKE AIR PRESSURE SEN- SOR on page 8-112.
FUEL INJECTION SYSTEM 8-53 Fault code No. 15 Symptom Throttle position sensor:open or short circuit detected. Diagnostic code No. 01 Throttle position sensor Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Installed condition of throttle position sensor. Check for looseness or pinch- ing. Check that is installed in the specified position. Turning the main switch to “ON”. 2 Connections Throttle position sensor coupler Main wire harness ECU coupler Sub-wire harness coupler Check the couplers for any pins that may be pulled out. Check the locking condition of the couplers. If there is a malfunction, repair it and connect the coupler securely. 3 Open or short circuit in wire harness. Repair or replace if there is an open or short circuit. Between throttle position sensor coupler and ECU coupler (Black/Blue–Black/Blue) (Yellow–Yellow) (Blue–Blue) 4 Throttle position sens or lead wire open circuit output voltage check. Check for open circuit and replace the throttle position sen- sor. (Black/Blue–Yellow) Open circuit item Output voltage Ground wire open circuit 5 V Output wire open circuit 0 V Power supply wire open circuit 0 V 5 Defective throttle position sensor. Execute the diagnostic mode. (Code No.01) Replace if defective. Refer to CHECKING THE THROTTLE POSITION SEN- SOR on page 8-109.
FUEL INJECTION SYSTEM 8-54 Fault code No. 16 Symptom Stuck throttle position sensor detected. Diagnostic code No. 01 Throttle position sensor Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Installed condition of throttle position sensor. Check the installed area for looseness or pinching. Check that is installed in the specified position. Refer to THROTTLE BODIES on page 7-4 section. Reinstated by starting the engine, operat- ing it at idle, and then racing it. 2 Defective throttle position sensor. Execute the diagnostic mode. (Code No.01) Replace if defective. Refer to THROTTLE BODIES on page 7-4 section. Fault code No. 17 Symptom EXUP servo motor circuit:open or short circuit detected. Diagnostic code No. 53 EXUP servo motor Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Connections EXUP servo motor coupler Main wire harness ECU coupler Check the couplers for any pins that may be pulled out. Check the locking condition of the couplers. If there is a malfunction, repair it and connect the coupler securely. Turning the main switch to “ON”. 2 Open or short circuit in wire harness. Repair or replace if there is an open or short circuit. Between EXUP servo motor coupler and ECU coupler (Blue–Blue) (White/Red–White/Red) (Black/Blue–Black/Blue) 3 Defective EXUP servo motor (poten- tion circuit). Execute the diagnostic mode. (Code No.53) Replace if defective. Refer to CHECKING THE EXUP SERVO MOTOR on page 3-18.
FUEL INJECTION SYSTEM 8-55 Fault code No. 18 Symptom EXUP servo motor is stuck. Diagnostic code No. 53 EXUP servo motor Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Connections EXUP servo motor coupler Main wire harness ECU coupler Check the couplers for any pins that may be pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect the coupler securely. Turning the main switch to “ON”. 2 Open or short circuit in wire harness. Repair or replace if there is an open or short circuit. Between EXUP servo motor coupler and ECU coupler. (Black/Green–Black/Green) (Black/Red–Black/Red) 3 Defective EXUP servo motor Execute the diagnostic mode. (Code No.53) Replace if defective. Refer to CHECKING THE EXUP SERVO MOTOR on page 3-18. 4 Defective EXUP valve, pulley, and cables Replace if defective. Fault code No. 19 Symptom Open circuit is detected in the input line of ECU No.24 ter- minal is difected when the start switch is pressed. Diagnostic code No. 20 Sidestand switch Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Connections Main wire harness ECU coupler Execute the diagnostic mode. (Code No.20) Check the coupler for any pins that may be pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect the coupler securely. If the transmis- sion is in gear, retracting the sidestand. If the transmis- sion is in neu- tral, reconnecting the wiring. 2 Open or short circuit in wire harness or sub lead. Repair or replace if there is an open or short circuit. Between sidestand switch cou- pler and ECU coupler (Black–Black) 3 Defective sidestand switch Replace if defective. Refer to CHECKING THE SWITCHES on page 8-93.
FUEL INJECTION SYSTEM 8-56 Fault code No. 20 SymptomWhen the main switch is turned to “ON”, the atmospheric pressure sensor voltage and intake air pressure sensor voltage differ greatly. Diagnostic code No. 02 03Atmospheric pressure sensor Intake air pressure sensor Orde r Item/components and probable cause Check or maintenance job Reinstatement method 1 Defective intake air pressure sensor or atmospheric pressure sensor. Execute the diagnostic mode. (Code Nos. 02, 03) Replace if defective. Refer to CHECKING THE INTAKE AIR PRESSURE SEN- SOR on page 8-112 or CHECKING THE ATMO- SPHERIC PRESSURE SEN- SOR on page 8-111. Turning the main switch to “ON”. Fault code No. 21 Symptom Coolant temperature sensor:open or short circuit detected. Diagnostic code No. 06 Coolant temperature sensor Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Connections Coolant temperature sensor coupler Main wire harness ECU coupler Sub-wire harness coupler Check the coupler for any pins that may be pulled out. Check the locking condition of the couplers. If there is a malfunction, repair it and connect the coupler securely. Turning the main switch to “ON”. 2 Open or short circuit in wire harness. Repair or replace if there is an open or short circuit. Between coolant temperature sensor coupler and ECU cou- pler. (Green/White–Green/White) (Black/Blue–Black/Blue) 3 Defective coolant temperature sensor. Execute the diagnostic mode. (Code No.06) Replace if defective. Refer to CHECKING THE COOLANT TEMPERATURE SENSOR on page 8-108.