Yamaha Wr250r 2008 Manual
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FUEL INJECTION SYSTEM 8-50 Fault code No. 42 SymptomA. No normal signals are received from the speed sensor. B. Open or short circuit is detected in the neutral switch. Diagnostic monitoring code No.A 07 Speed sensor B 21 Neutral switch OrderItem/components and probable cause Check or maintenance jobReinstatement method B-1 Installed condition of neutral switch Check the installed area for loose- ness or pinching.Turn the main switch to “ON”. B-2 Connected state of connector. Neutral switch coupler Wire harness ECU coupler Check the coupler for any pins that may have pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect it securely. B-3 Open or short circuit in speed sensor lead. Repair or replace if there is an open or short circuit. Between relay unit coupler and ECU coupler (Black/Yellow – Black/Yellow) Between neutral switch and relay unit coupler (Sky blue – Sky blue) B-4 Defective neutral switch Execute the diagnostic monitoring mode. (Code No.21) Replace if defective. Refer to “CHECKING THE SWITCHES” on page 8-63. B-5 Defective shift drum (neutral detection location) Replace if defective. Refer to “TRANSMISSION” on page 5-64.
FUEL INJECTION SYSTEM 8-51 Fault code No. 43 Symptom Supply power to the fuel injector and fuel pump is not normal. Diagnostic monitoring code No.09 Fuel system voltage OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Connected state of connector Relay unit coupler Fuel pump coupler Fuel injector coupler ECU coupler Check the coupler for any pins that may have pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect it securely.Starting the engine and oper- ating it at idle. 2 Open or short circuit in the wire harness. Repair or replace if there is an open or short circuit. Between relay unit and ECU cou- pler (Red/Blue – Red/Blue) Between relay unit and fuse (EFI) (Brown/Yellow – Brown/Yellow) Between fuse (EFI) and battery (Brown/Yellow – Brown/Yellow) 3 Faulty battery voltage Execute the diagnostic monitoring mode. (Code No. 09) Charge or replace if defective. Fault code No. 44 SymptomError is detected while reading or writing on EEPROM (CO adjustment valve). Diagnostic monitoring code No.60 EEPROM improper cylinder indication OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Malfunction in ECU 1. Execute the diagnostic monitoring mode. (Code No. 60) 2. Adjust the CO exhaust gas level, and set the abnormal exhaust gas level. Set until “0” is shown on the display. When defect cannot be repaired, replace the ECU.Turn the main switch to “ON”. (When displayed again, readjust the exhaust gas.)
FUEL INJECTION SYSTEM 8-52 Fault code No. 46 Symptom Power supply to the FI system relay is not normal. Diagnostic monitoring code No.—— OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Connected state of connector Wire harness ECU coupler Check the coupler for any pins that may have pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect it securely.Starting the engine and oper- ating it at idle. 2 Faulty battery. Replace or charge the battery. Refer to “CHECKING AND CHARGING THE BATTERY” on page 8-68. 3 Malfunction of the rectifier/regulator Replace if defective. Refer to “CHARGING SYSTEM” on page 8-11 . 4 Open or short circuit in the wire harness. Repair or replace if there is an open or short circuit. Between battery and main switch. (Red – Red) Between main switch and fuse (ignition) (Brown – Brown) Between fuse (ignition) and ECU (Red/White – Red/White) Fault code No. 50 SymptomFaulty ECU memory. (When this malfunction is detected in the ECU, the fault code number might not appear on the meter.) Diagnostic monitoring code No.—— OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Malfunction in ECU Replace the ECU. Turning the main switch ON
FUEL INJECTION SYSTEM 8-53 Fault code No. Er-1 Symptom No signals are received from the ECU. Diagnostic monitoring code No.—— OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Connected state of connector Main wire harness ECU coupler Check the coupler for any pins that may have pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect it securely.Reinstated if nor- mal signal is received from the ECU when the main switch is turn to ON. 2 Open or short circuit in wire harness lead Repair or replace if there is an open or short circuit. Between meter coupler and ECU coupler (Yellow/Blue – Yellow/Blue) 3 Malfunction in meter unit Replace the meter unit. 4 Malfunction in ECU Replace the ECU. Fault code No. Er-2 SymptomNo signals are received from the ECU within the specified duration. Diagnostic monitoring code No.—— OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Connected state of connector Main wire harness ECU coupler Check the coupler for any pins that may have pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect it securely.Reinstated if nor- mal signal is received from the ECU when the main switch is turn to ON. 2 Open or short circuit in wire harness Repair or replace if there is an open or short circuit. Between meter coupler and ECU coupler (Yellow/Blue – Yellow/Blue) 3 Malfunction in meter unit Replace the meter unit. 4 Malfunction in ECU Replace the ECU.
FUEL INJECTION SYSTEM 8-54 Fault code No. Er-3 Symptom Data from the ECU cannot be received correctly. Diagnostic monitoring code No.—— OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Connected state of connector Main wire harness ECU coupler Check the coupler for any pins that may have pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect it securely.Reinstated if nor- mal signal is received from the ECU when the main switch is turn to ON. 2 Open or short circuit in wire harness lead. Repair or replace if there is an open or short circuit. Between meter coupler and ECU coupler (Yellow/Blue – Yellow/Blue) 3 Malfunction in meter unit Replace the meter unit. 4 Malfunction in ECU Replace the ECU. Fault code No. Er-4 Symptom Non-registered data has been received from the meter. Diagnostic monitoring code No.—— OrderItem/components and probable cause Check or maintenance jobReinstatement method 1 Connected state of connector Main wire harness ECU coupler Check the coupler for any pins that may have pulled out. Check the locking condition of the coupler. If there is a malfunction, repair it and connect it securely.Reinstated if nor- mal signal is received from the ECU when the main switch is turn to ON. 2 Open or short circuit in wire harness lead. Repair or replace if there is an open or short circuit. Between sensor coupler and ECU coupler (Yellow/Blue – Yellow/Blue) 3 Malfunction in meter unit Replace the meter unit. 4 Malfunction in ECU Replace the ECU.
FUEL PUMP SYSTEM 8-55 EAS27580 FUEL PUMP SYSTEM EAS27590 CIRCUIT DIAGRAM
FUEL PUMP SYSTEM 8-56 3. Main switch 4. Battery 5. Main fuse 8. Right handlebar switch 9. Engine stop switch 11. Relay unit 15. Fuel pump 16. ECU 56. Ignition fuse 58. EFI fuse
FUEL PUMP SYSTEM 8-57 EAS27600 TROUBLE SHOOTING The fuel pump fails to operate. NOTE: Before troubleshooting, remove the following part(s): 1. Seat 2. Side cover (left/right) 3. Fuel tank 1. Check the fuse (Main fuse, ignition fuse, EFI fuse) Refer to “CHECKING THE FUSES” on page 8-67 .NG → Replace the fuse(s). OK ↓ 2. Check the battery. Refer to “CHECKING AND CHARG- ING THE BATTERY” on page 8-68 .NG → Clean the battery terminals. Recharge or replace the battery. OK ↓ 3. Check the main switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the main switch. OK ↓ 4. Check the engine stop switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the right handlebar switch. OK ↓ 5. Check the relay unit (fuel pump relay). Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace relay unit (fuel pump relay) OK ↓ 6. Check fuel pressure Refer to “CHECKING THE PRES- SURE REGULATOR” on page 7-6 .NG → Replace the fuel pump. OK ↓ 7. Check the fuel pump system wire harness connections. Refer to “CIRCUIT DIAGRAM” on page 8-55 .NG → Properly connect or repair the fuel pump system ’ s wiring. OK ↓ Replace the ECU.
ELECTRICAL COMPONENTS 8-59 EAS27971 ELECTRICAL COMPONENTS EAS32D1011 2 3 4 7 5 8 10 12 1 11 6 9 13