Yamaha MBK XMAX 2014, Service Manual

Page: 381 / 482

FUEL INJECTION SYSTEM
8-68
Fault code No. 50
Item
Faulty ECU memory. (When this malfunction is detected in the
ECU, the fault code number might not appear on the multi-
function meter.)
Fail-safe system
Unable to start engine
Unable to drive vehicle
Diagnostic code No. —
FI diagnostic tool display —
Procedure —
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Malfunction in ECU. Replace the ECU. Turn the main switch to “ON”.
Check that the fault code
number is not displayed.
Fault code No. 61
Item ISC (idle speed control) unit: open or short circuit detected.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. —
FI diagnostic tool display —
Procedure —
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Connection of ISC (idle
speed control) unit coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins). Improperly connected
→
Connect the coupler secure-
ly or replace the wire har-
ness.
Turn the main switch to “ON”.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 2.
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins). Improperly connected
→
Connect the coupler secure-
ly or replace the wire har-
ness.
Turn the main switch to “ON”.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 3.