Page 305 of 362

FUEL INJECTION SYSTEM
8-13
CONNECTING THE YAMAHA DIAGNOSTIC TOOL
1. Remove the coupler for connecting setting tool.
2. Connect the FI diagnostic tool sub-lead.
3. Connect the FI diagnostic tool sub-lead to the battery.
TIP
• Prepare the fully charged 12 V battery for yourself.
• For information on how to connect and use the Yamaha diagnostic tool, refer to “YAMAHA DIGNO-
STIC TOOL OPERATION MANUAL”.
EASB111327TROUBLESHOOTING DETAILS
This section describes the measures per fault code No. displayed on the Yamaha diagnostic tool.
Check and service the items or components that are the probable cause of the malfunction following
the order given in the troubleshooting chart.
After the check and service of the malfunctioning part have been completed, reset the Yamaha diag-
nostic tool display according to the “Reinstatement method”.
Fault code No.: To be displayed on the Yamaha diagnostic tool when the engine fails to work nor-
mally
Diagnostic code No.: To be used when the diagnostic mode is active FI diagnostic tool sub-lead
90890-03212
YU-03212
1. Vehicle
2. Coupler for connecting optional part
3. FI diagnostic tool sub-lead
4. Sub-harness (included with the Yamaha di-
agnostic tool)
5. Vehicle communication cable (included with
the Yamaha diagnostic tool)
6. Yamaha diagnostic tool
7. Battery (12 V)
1
3 2
2456
7
Page 306 of 362

FUEL INJECTION SYSTEM
8-14
Fault code 12
SymptomCrankshaft position sensor: no normal signals are received
from the crankshaft position sensor.
Fail-safe systemUnable to start engine
Unable to drive vehicle
Diagnostic code No.—
Diagnostic tool display—
Procedure—
Or-
derProbable cause of malfunc-
tion and checkMaintenance job Reinstatement method
1 Connection of crankshaft po-
sition sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
3 Wire harness continuity. Open or short circuit Re-
place the wire harness.
Between the crankshaft posi-
tion sensor coupler and ECU
coupler.
gray–gray
black/blue–black/blueCrank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
4 Mounted condition of crank-
shaft position sensor.
Check for looseness or
pinching.
Check the gap between the
crankshaft position sensor
and the pickup rotor.Improperly mounted sensor
Remount or replace the
sensor. “AC MAGNETO” on
page 5-61.Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
5 Defective crankshaft position
sensor.Check the crankshaft position
sensor.
“CHECKING THE CRANK-
SHAFT POSITION SEN-
SOR” on page 8-42.Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
6 Faulty ECU Replace the ECU.
Page 307 of 362

FUEL INJECTION SYSTEM
8-15
TIP
If fault code Nos. 13 and 14 are both displayed, perform checkup and repair jobs for fault code No.
13 first.
Fault code 13
Symptom Intake air pressure sensor: open or short circuit detected.
Fail-safe systemAble to start engine
Able to drive vehicle
Diagnostic code No.03
Diagnostic tool displayDisplays the intake air pressure.
ProcedureThe atmospheric pressure is displayed on the Yamaha diagnostic
tool.
Or-
derProbable cause of malfunc-
tion and checkMaintenance job Reinstatement method
1 Connection of intake air pres-
sure sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
3 Connection of sub wire har-
ness coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the sub-
wire harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
4 Wire harness continuity. Open or short circuit Re-
place the wire harness.
Between intake air pressure
sensor coupler and ECU cou-
pler.
pink/black–pink/black
blue–blue
black/blue–black/blueTurn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
5 Mounted condition of intake
air pressure sensor.
Check for looseness or
pinching.
Check the mounted position
for correctness.Improperly mounted sensor
Remount or replace the
sensor.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
Page 308 of 362

FUEL INJECTION SYSTEM
8-16
TIP
If fault code Nos. 13 and 14 are both displayed, perform checkup and repair jobs for fault code No.
13 first.6 Defective intake air pressure
sensor.Execute the diagnostic mode.
(Code No.03)
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: About
101 kPa
1000 m above sea level:
About 90 kPa
2000 m above sea level:
About 80 kPa
3000 m above sea level:
About 70 kPaTurn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
7 Faulty ECU Replace the ECU.
Fault code 14
SymptomIntake air pressure sensor: hose system malfunction (clogged
or detached hose)
Fail-safe systemAble to start engine
Able to drive vehicle
Diagnostic code No.03
Diagnostic tool displayDisplays the intake air pressure.
ProcedureThe atmospheric pressure is displayed on the Yamaha diagnostic
tool.
Or-
derProbable cause of malfunc-
tion and checkMaintenance job Reinstatement method
1 The intake air pressure sen-
sor hose is damaged, discon-
nected, clogged, twisted or
bent.Repair or replace the sensor
hose.After starting the engine, idle
this and wait about 5 sec-
onds.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order. Fault code 13
Symptom Intake air pressure sensor: open or short circuit detected.
Page 309 of 362

FUEL INJECTION SYSTEM
8-17
2 Defective intake air pressure
sensor.Execute the diagnostic mode.
(Code No. 03)
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: About
101 kPa
1000 m above sea level:
About 90 kPa
2000 m above sea level:
About 80 kPa
3000 m above sea level:
About 70 kPa
Fault code 15
Symptom Throttle position sensor: open or short circuit detected.
Fail-safe systemAble to start engine
Able to drive vehicle
Diagnostic code No.01
Diagnostic tool displayDisplays the throttle angle.
• 11–14 (throttle in fully closed position)
• 109–116 (throttle in fully opened position)
ProcedureCheck with throttle valves fully closed.
Check with throttle valves fully opened.
Or-
derProbable cause of malfunc-
tion and checkMaintenance job Reinstatement method
1 Connection of throttle posi-
tion sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order. Fault code 14
SymptomIntake air pressure sensor: hose system malfunction (clogged
or detached hose)
Page 310 of 362

FUEL INJECTION SYSTEM
8-18
3 Connection of sub wire har-
ness coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the sub-
wire harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
4 Wire harness continuity. Open or short circuit Re-
place the wire harness.
Between throttle position
sensor coupler and ECU cou-
pler.
yellow–yellow
blue–blue
black/blue–black/blueTurn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
5 Mounted condition of throttle
position sensor.
Check for looseness or
pinching.
Check the mounted condition
for correctness.Improperly mounted sensor
Remount or replace the
sensor.
Refer to “ADJUSTING THE
THROTTLE POSITION SEN-
SOR” on page 7-9.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
6 Applied voltage of throttle po-
sition sensor lead.Check the applied voltage.
(black/blue–blue)
Refer to “CHECKING THE
THROTTLE POSITION SEN-
SOR” on page 8-44.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
Location of discon-
nected leadOutput
voltage
Disconnected
ground lead5 V
Disconnected out-
put lead0 V
Disconnected
power supply lead0 V
7 Defective throttle position
sensor.Execute the diagnostic mode.
(Code No. 1)
When the throttle is fully
closed, 11–14 displays.
When the throttle is fully
opened, 109–116 displays.
Incorrect display range
Replace the throttle position
sensor.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
8 Faulty ECU Replace the ECU. Fault code 15
Symptom Throttle position sensor: open or short circuit detected.
Page 311 of 362

FUEL INJECTION SYSTEM
8-19
Fault code 16
SymptomThrottle position sensor: stuck throttle position sensor is de-
tected.
Fail-safe systemAble to start engine
Able to drive vehicle
Diagnostic code No.01
Diagnostic tool displayDisplays the throttle angle.
• 11–14 (throttle in fully closed position)
• 109–116 (throttle in fully opened position)
ProcedureCheck with throttle valves fully closed.
Check with throttle valves fully opened.
Or-
derProbable cause of malfunc-
tion and checkMaintenance job Reinstatement method
1 Mounted condition of throttle
position sensor.
Check for looseness or
pinching.
Check the mounted condition
for correctness.Improperly mounted sensor
Remount or replace the
sensor.
Refer to “ADJUSTING THE
THROTTLE POSITION SEN-
SOR” on page 7-9.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
2 Defective throttle position
sensor.Execute the diagnostic mode.
(Code No. d:01)
When the throttle is fully
closed, 11–14 displays.
When the throttle is fully
opened, 109–116 displays.
Incorrect display range
Replace the throttle position
sensor.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
3 Faulty ECU Replace the ECU.
Page 312 of 362

FUEL INJECTION SYSTEM
8-20
TIP
Make sure that the machine is completely cold before checking the coolant temperature sensor.
Fault code 21
Symptom Coolant temperature sensor: open or short circuit detected.
Fail-safe systemAble to start engine
Able to drive vehicle
Diagnostic code No.06
Diagnostic tool displayDisplays the coolant temperature.
ProcedureCompare the actually measured coolant temperature with the
Yamaha diagnostic tool display value.
Or-
derProbable cause of malfunc-
tion and checkMaintenance job Reinstatement method
1 Connection of coolant tem-
perature sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
3 Wire harness continuity. Open or short circuit Re-
place the wire harness.
Between coolant temperature
sensor coupler and ECU cou-
pler.
green/white–green/white
black/blue–black/blueTurn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
4 Mounted condition of coolant
temperature sensor.
Check for looseness or
pinching.
Check the mounted condition
for correctness.Improperly mounted sensor
Remount or replace the
sensor.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
5 Defective coolant tempera-
ture sensor.Execute the diagnostic mode.
(Code No. 06)
When the machine is cold,
displayed temperature is
close to the ambient temper-
ature.
Improper display Replace
the coolant temperature sen-
sor.Turn “ON” the switch on the
FI diagnostic tool sub-lead.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.