Yamaha MBK MW125 2014 Service Manual page 345

Fault code No. 50
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Malfunction in ECU.
Fault code No. 61
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Action
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of ISC valve cou-
pler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
2 Connection of wire harness
ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
50
Faulty ECU memory. (When this malfunction is detected in the ECU,
the fault code number might not appear on the tool display.)
Unable to start engine
Unable to drive vehicle
—
—
—
Maintenance job
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-59.
61
ISC (idle speed control) unit: open or short circuit detected.
Able to start engine
Able to drive vehicle
54
The ISC (idle speed control) valve fully closes, and then it turn back fully
opens.
This operation takes approximately 3 seconds.
Check that ISC valve is actuated by listening for the operating sound.
Maintenance job
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
8-48
FUEL INJECTION SYSTEM
Confirmation of service com-
Turn the main switch to "ON".
Check that the fault code num-
ber is not displayed.
Confirmation of service com-
Set the main switch to "ON".
Fault code number is not dis-
played → Service is fin-
ished.Fault code number is
displayed → Go to item 2.
Set the main switch to "ON".
Fault code number is not dis-
played → Service is fin-
ished.Fault code number is
displayed → Go to item 3.
pletion
pletion