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Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 69

7-6

FUEL INJECTION SYSTEM

TROUBLESHOOTING CHART

Engine operation is not normal or the warning light and self-diagnostic warning indicator on the LCD flash.

* The warning light and self-diagnostic warning indicator on the LCD may not flash even if the engine operation is

not normal.

The warning light and self-diagnostic warning indica-
tor on the LCD flash.

Check the fault code number displayed on the meter.

Identify the system with the malfunction. (Refer to
“Self-Diagnostic-Function table”.)

Identify the probable cause of the malfunction. (Refer
to “Fault code table”.)

Check and repair the probable cause of the malfunction.

Fault code No.

No fault code No.

Check and repair.
(Refer to “TROUBLE-
SHOOTING
DETAILS”.)
Monitor the operation of
the sensors and actua-
tors in the diagnostic
mode. (Refer to “Diag-
nostic mode table”.)

Check and repair.

Perform the fuel injection system reinstatement
action. (Refer to “Reinstatement method” in “TROU-
BLESHOOTING DETAILS”.)

Turn the main switch off, turn the main switch back
on, and then check if the fault code number is still dis-
played.

Repairs completed

Fault code number not displayed

Erasing the malfunction history:*
The malfunction history is stored even if the main switch is turned off.
The malfunction history must be erased in the diagnostic mode. (Refer to the “Diagnostic mode table (Diagnostic code
No. 62)”.)

* Operated when the warning light

and self-diagnosis warning indicator

flash.

The warning light and self-diagnostic warning indica-
tor on the LCD does not flash.

Check the operation of the following sensors and
actuators in the diagnostic mode. (Refer to “Diagnos-
tic mode table”.)
01: Throttle position sen-

sor (throttle angle)

03, 04:Intake air pres-

sure

05: Intake air tempera-

ture

06: Coolant temperature
07: Snowmobile speed

pulse

09: Fuel system voltage

(battery voltage)

30: Cylinder-#1 ignition

coil

31: Cylinder-#2 ignition

coil

32: Cylinder-#3 ignition

coil

36: Injector #1
37: Injector #2
38: Injector #3

Engine malfunction

Defective sensor or
actuator

Check and repair the
inner parts of the
engine. (Refer to
CHAPTER 5.)

Check and repair the
corresponding sen-
sor or actuator.

Check the engine condition.

Fault code number
displayed

7-7

FUEL INJECTION SYSTEM

DIAGNOSTIC MODE

It is possible to monitor the sensor output data or
check the activation of actuators without connecting
the measurement equipment by simply switching
the meter indication from the normal mode to the
diagnostic monitoring mode.

Setting the diagnostic mode

1. Turn the main switch off and set the engine stop

switch to “RUN”.

2. Disconnect the wire harness coupler from the

fuel pump.

3. Simultaneously press and hold the “SELECT”

and “RESET” buttons, turn the main switch on,
and continue to press the buttons for 8 seconds
or more.

NOTE:

• All displays on the meter disappear except the

odometer/tripmeter/engine speed meter displays.

• “dIAG” appears on the odometer/tripmeter/engine

speed meter LCD.

4. Check that “dIAG” appears, and then simulta-

neously press the “SELECT” and “RESET” but-
tons for 2 seconds or more to activate the
diagnostic mode. The diagnostic code number
“01” appears on the speedometer LCD.

5. Select the diagnostic code number correspond-

ing to the fault code number by pressing the
“SELECT” and “RESET” buttons.

NOTE:

• To decrease the selected diagnostic code num-

ber, press the “RESET” button. Press the
“RESET” button for 1 second or longer to auto-
matically decrease the diagnostic code numbers.

• To increase the selected diagnostic code num-

ber, press the “SELECT” button. Press the
“SELECT” button for 1 second or longer to auto-
matically increase the diagnostic code numbers.

“SELECT”

“RESET”

“01

70”

“70

01”

7-8

FUEL INJECTION SYSTEM

6. Verify the operation of the sensor or actuator.

• Sensor operation

The data representing the operating condi-
tions of the sensor appears on the odometer/
tripmeter/engine speed meter LCD.

• Actuator operation

Push the grip warmer side of the grip/thumb
warmer adjustment switch to operate the
actuator.
If the grip warmer side of the switch is pushed
again while the actuator is operating, the actu-
ator operation will stop and restart from the
beginning.

7. Turn the main switch off to cancel the diagnostic

mode.

NOTE:

To perform a reliable diagnosis, make sure to turn
off the power supply before every check and then
start right from the beginning.

7-9

FUEL INJECTION SYSTEM

Fault code table

Fault

code No.

Symptom

Probable cause of malfunction

Diagnostic code No.

No normal signals are
received from the crankshaft
position sensor.

• Open or short circuit in wire harness.
• Defective crankshaft position sensor.
• Malfunction in pickup rotor (primary sheave drive shaft assem-

bly).

• Malfunction in ECU.
• Improperly installed crankshaft position sensor.

—

Intake air pressure sensor 1
(cylinders #1, #2, and #3):
open or short circuit detected.

• Open or short circuit in wire harness.
• Open or short circuit in fuel injection system sub-wire harness.
• Defective intake air pressure sensor 1.
• Malfunction in ECU.

Intake air pressure sensor 1
(cylinders #1, #2, and #3):
hose system malfunction
(clogged or detached hose).

• Intake air pressure sensor 1 hoses are detached, clogged,

kinked, or pinched.

• Malfunction in ECU.

Throttle position sensor: open
or short circuit detected.

• Open or short circuit in wire harness.
• Open or short circuit in fuel injection system sub-wire harness.
• Defective throttle position sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.

Stuck throttle position sensor
detected.

• Stuck throttle position sensor.
• Malfunction in ECU.

Coolant temperature sensor:
open or short circuit detected.

• Open or short circuit in wire harness.
• Open or short circuit in coolant temperature sensor sub-lead.
• Defective coolant temperature sensor.
• Malfunction in ECU.

Intake air temperature sen-
sor: open or short circuit
detected.

• Open or short circuit in wire harness.
• Open or short circuit in fuel injection system sub-wire harness.
• Defective intake air temperature sensor.
• Malfunction in ECU.

Intake air pressure sensor 2
(cylinder #1): open or short
circuit detected.

• Open or short circuit in wire harness.
• Open or short circuit in fuel injection system sub-wire harness.
• Defective intake air pressure sensor 2.
• Malfunction in ECU.

Intake air pressure sensor 2
(cylinder #1): hose system
malfunction (clogged or
detached hose).

• Intake air pressure sensor 2 hose is detached, clogged, kinked,

or pinched.

• Malfunction in ECU.

Engine stops when an oil
pressure drop is detected.

• Oil pressure dropped.

—

Malfunction detected in the
primary lead of the cylinder-
#1 ignition coil.

• Open or short circuit in wire harness.
• Malfunction in cylinder-#1 ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition system.

Malfunction detected in the
primary lead of the cylinder-
#2 ignition coil.

• Open or short circuit in wire harness.
• Malfunction in cylinder-#2 ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition system.

Malfunction detected in the
primary lead of the cylinder-
#3 ignition coil.

• Open or short circuit in wire harness.
• Malfunction in cylinder-#3 ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition system.

Content .. 67 68 69 70 ..