Yamaha WR250F Owner's Service Manual page 384

TIP
Before troubleshooting, disconnect the starter motor lead from the starter relay.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Diagnostic tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Locate the malfunction
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) EEP-
ROM data error for setting
tool adjustment values for
fuel injection amount or igni-
tion timing.
4 Malfunction in ECU.
44
EEPROM fault code number: an error is detected while read-
ing or writing on EEPROM.
Able/Unable to start engine
Able/Unable to drive vehicle
60
EEPROM fault code display
• 00: No fault
• 01: CO adjustment value
• 07: Setting tool adjustment values 0–8 for fuel injection amount or
ignition timing
—
Maintenance job
Execute the diagnostic mode
(Code No. 60).
00: Go to item 4.
01: Go to item 2.
07: Go to item 3.
Change the CO concentra-
tion, and rewrite in EEPROM.
After this adjustment, push
the engine stop switch, then
push the start switch.
Memory not recovered  Re-
place the ECU.
Erase the setting map in the
diagnostic mode (diagnostic
code No. 65).
Replace the ECU.
9-50
FUEL INJECTION SYSTEM
Confirmation of service
completion
—
Push the start switch.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Repeat the proce-
dure in item 1. If the same
number is indicated, perform
the procedure in item 4.
Push the start switch.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Repeat the proce-
dure in item 1. If the same
number is indicated, perform
the procedure in item 4.