Yamaha YZ250F Owner's Service Manual page 312

Fault code
Symptom
Fail-safe system
Diagnostic code No.
Diagnostic tool display
Procedure
Or- Probable cause of malfunc-
der tion and check
1 Identification of malfunction-
ing point.
2 "01" is indicated in Diagnostic
mode (Code No. 60). EEP-
ROM data error for adjust-
ment of CO concentration.
3 "07" is indicated in Diagnostic
mode (Code No. 60). EE-
PROM data error for setting
tool adjustment values for
fuel injection amount or igni-
tion timing.
4 Faulty ECU
44
EEPROM fault code No.: an error is detected while reading or
writing on EEPROM.
Able/Unable to start engine
Able/Unable to drive vehicle
60
Displays the location of the abnormal portion of the EEPROM data.
• 00: No fault
• 01: CO adjustment valve
• 07: Power Tuner injection correction setting 0–8, or Power Tuner
ignition timing correction setting 0–8
—
Maintenance job
Execute the diagnostic mode.
(Code No. 60)
00: Perform a checkup in or-
der 4.
01: Perform a checkup in or-
der 2.
07: Perform a checkup in or-
der 3.
Change the CO concentra-
tion, and rewrite in EEPROM.
After this adjustment, turn
OFF the switch on the FI di-
agnostic tool sub-lead, and
turn it ON again.
Memory not recovered  Re-
place the ECU.
Erase the setting map in the
diagnostic mode.
(Code No. 65)
Replace the ECU.
8-26
FUEL INJECTION SYSTEM
Reinstatement method
Turn "ON" the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played  Repair is finished.
Fault code number is dis-
played  Repeat the proce-
dure in order 1. If the same
number is indicated, perform
the procedure in order 3.
Turn "ON" the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played  Repair is finished.
Fault code number is dis-
played  Repeat the proce-
dure in order 1. If the same
number is indicated, perform
the procedure in order 4.