Yamaha 2014 MT-07 Service Manual page 461

Fault code No.
Item
B-7 Malfunction in ECU.
B-8 Delete the fault code.
Fault code No. 39
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuation
36
Procedure
Actuation
37
Procedure
Probable cause of malfunc-
Item
tion and check
1 Identify the malfunctioning fuel
injector
2 Connection of fuel injector #1
and/or fuel injector #2 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).
37
Component other than ISC (idle speed control) unit is defec-
A
tive (ISC operating sound is heard).
Defective ISC (idle speed control) unit (ISC operating sound is
B
not heard).
Replace the ECU.
Refer to "REPLACING THE
ECU (engine control unit)" on
page 8-128.
39
Fuel injector: open or short circuit detected.
Able to start engine (depending on the number of faulty cylinders)
Able to drive vehicle (depending on the number of faulty cylinders)
36, 37
Actuates fuel injector #1 five times at one-second intervals.
The "CHECK" indicator and "
comes on each time the fuel injector is actuated.
Check that fuel injector #1 is actuated five times by listening for the oper-
ating sound.
Actuates fuel injector #2 five times at one-second intervals.
The "CHECK" indicator and "
comes on each time the fuel injector is actuated.
Check that fuel injector #2 is actuated five times by listening for the oper-
ating sound.
Maintenance job
Execute the diagnostic mode.
(Code Nos. 36, 37)
Identify the fuel injector that
does not produce an operating
sound.
Perform the following proce-
dures for the defective fuel injec-
tor.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
8-56
FUEL INJECTION SYSTEM
Start the engine and let it idle for
approximately 10 seconds.
Check that the fault code num-
ber is not displayed.
" on the Yamaha diagnostic tool screen
" on the Yamaha diagnostic tool screen
Confirmation of service com-
Execute the diagnostic mode.
(Code Nos. 36, 37)
No operating sound → Go to
item 3.
Operating sound → Go to item
7.
pletion