Yamaha MBK XMAX 2014, Service Manual

Page: 382 / 482

FUEL INJECTION SYSTEM
8-69
TIP
Do not remove the ISC (idle speed control) valve.
3 Wire harness continuity. Open or short circuit
→
Re-
place the wire harness.
Between ISC (idle speed
control) unit coupler and
ECU coupler.
pink–pink
light green–light green
green–green
sky blue–sky blue
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 4.
4 Defective ISC (idle speed
control) unit. Execute the diagnostic
mode. (Code No. D54).
ISC (idle speed control)
valve operating sound is not
heard.
→
Replace the throt-
tle body assembly.
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 5.
5 Malfunction in ECU. Replace the ECU.
Fault code No. Er-1
Item
ECU (engine control unit) internal malfunction (output signal
error): signals cannot be transmitted between the ECU and the
multi-function meter.
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 meter assem-
bly 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.
Fault code No. 61
Item ISC (idle speed control) unit: open or short circuit detected.