Yamaha MBK XMAX 2014, Service Manual

Page: 374 / 482

FUEL INJECTION SYSTEM
8-61
• If fault code numbers “37” and “46” are both indicated, take the actions specified for fault code number
“46” first.
• If fault code numbers “37” and “42” are both indicated, take the actions specified for fault code number
“42” first.
Fault code No. 39
Item Injector: open or short circuit detected.
Fail-safe system
Unable to start engine
Unable to drive vehicle)
Diagnostic code No. D36
Actuation
Actuates injector five times at one-second intervals.
Illuminates the engine trouble warning light.
Procedure
Check that injector is actuated five times by listening for the oper-
ating sound.
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Connection of injector cou-
pler.
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.
Execute the diagnostic
mode. (Code No. D36)
No operating sound
→
Go to
item 2.
Operating sound
→
Go to
item 6.
2 Defective injector. Measure the injector resis-
tance.
Replace if out of specifica-
tion.
Refer to “CHECKING THE
FUEL INJECTOR” on page
8-149. Execute the diagnostic
mode. (Code No. D36)
No operating sound
→
Go to
item 3.
Operating sound
→
Go to
item 6.
3 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.
Execute the diagnostic
mode. (Code No. D36)
No operating sound
→
Go to
item 4.
Operating sound
→
Go to
item 6.
4 Wire harness continuity. Open or short circuit
→
Re-
place the wire harness.
Between injector coupler and
ECU coupler.
red/black–red/black
orange/black–orange/black
Execute the diagnostic
mode. (Code No. D36)
No operating sound
→
Go to
item 5.
Operating sound
→
Go to
item 6.
5 Malfunction in ECU. Replace the ECU.
6 Delete the fault code. Start the engine and let it idle
for approximately 5 seconds.
Check that the fault code
number is not displayed.