Yamaha WR250F Owner's Service Manual

Also see for wr250f: Owner's service manual Owner's service manual Owner's service manual Owner's service manual Owner's service manual

Contents

FUEL INJECTION SYSTEM9-463 Connection of sub wire har-ness coupler.Check the lock-ing condition of thecoupler.Disconnect the cou-pler and check the pins (bentor broken terminals and lock-ing condition of the pins).Improperly connected Connect the coupler secure-lyor repair/replace the subwire harness.Start the engine and let it idlefor approximately 5 seconds.Fault code number is not dis-played  Service is finished.Fault code number is dis-played  Go to item 4.4 Wire harness continuity. Open or short circuit  Re-place the wire harness.Between ignition coil couplerand ECU coupler.orange–orangeStart the engine and let it idlefor approximately 5 seconds.Fault code number is not dis-played  Service is finished.Fault code number is dis-played  Go to item 5.5 Installed condition of ignitioncoil.Check for looseness orpinching.Improperly installed sensor Reinstall or replace thesensor.Start the engine and let it idlefor approximately 5 seconds.Fault code number is not dis-played  Service is finished.Fault code number is dis-played  Go to item 6.6 Defective ignition coil. (testthe primary coils for continu-ity)Check the ignition coil.Replace if defective.Refer to “CHECKING THEIGNITION COIL” on page 9-74.Start the engine and let it idlefor approximately 5 seconds.Fault code number is not dis-played  Service is finished.Fault code number is dis-played  Go to item 7.7 Malfunction in ECU. Execute the diagnostic mode(diagnostic code No. 30).No spark  Replace theECU.Fault code No. 33Item Ignition coil: open or short circuit detected in the primary leadof the ignition coil.