Yamaha MBK XMAX 2014, Service Manual

Page: 379 / 482

FUEL INJECTION SYSTEM
8-66
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 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.
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 2.
2 Wire harness continuity. Open or short circuit
→
Re-
place the wire harness.
Between battery terminal
and ECU coupler.
red–red/black
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played
→
Service is finished.
Fault code number is dis-
played
→
Go to item 3.
3 Malfunction in ECU. Replace the ECU.
Fault code No. 44
Item
EEPROM fault code number: an error is detected while reading
or writing on EEPROM.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. D60
FI diagnostic tool display
EEPROM fault code display
• 00 (no history)
• 01: CO adjustment value (history exists)
• 03: Immobilizer code (history exists)
• 04: ISC (idle speed control) unit learning values (history exists)
If there are multiple errors, they are displayed in two seconds in-
tervals.
Procedure —
Item
Probable cause of mal-
function and check
Maintenance job
Confirmation of service
completion
1 Locate the malfunction. Execute the diagnostic
mode. (Code No. D60)
00: Go to item 5.
01: Go to item 2.
03: Go to item 3.
04: Go to item 4. —
Fault code No. 43
Item
Fuel system voltage: incorrect voltage supplied to the fuel in-
jector and fuel pump.