Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Instruction - part 65

 

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Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Instruction - part 65

 

 

7-6

FI

FUEL INJECTION SYSTEM

TROUBLESHOOTING CHART

Engine operation is not normal or the warning light 

and self-diagnosis warning indicator flash

.

* Warning light 

and self-diagnosis warning indicator may

 not flash even if the engine operation is not normal.

The warning light 

and self-diagnosis warning indi-

cator 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. 
(Refer to “Self-Diagnos-
tic-Function table”.)

Perform the ECU reinstatement action. (Refer to 
“Reinstatement method” in “TROUBLESHOOTING 
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-diagnosis 

warning indica-

tor do not come on.

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

07: Vehicle speed pulse
09: Fuel system voltage 

(battery voltage)

30: Cylinder-#1 ignition 

coil

31: Cylinder-#2 ignition 

coil

36: Injector #1
37: Injector #2

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

OK

NG

NG

OK

OK

OK

7-7

FI

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 displays.

• “dIAG” appears on the odometer/tripmeter 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

FI

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 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

FI

FUEL INJECTION SYSTEM

Fault code table

Fault 

code No.

Symptom

Probable cause of malfunction

Diagnostic code No.

11

No normal signals are 
received from the cylinder 
identification sensor.

• Open or short circuit in wire harness.
• Defective cylinder identification sensor.
• Malfunction in ECU.
• Improperly installed cylinder identification sensor.

12

No normal signals are 
received from the crankshaft 
position sensor.

• Open or short circuit in wire harness.
• Defective crankshaft position sensor.
• Malfunction in A.C. magneto rotor.
• Malfunction in ECU.
• Improperly installed crankshaft position sensor.

13

Cylinder-#1 intake air pres-
sure sensor: open or short 
circuit detected.

• Open or short circuit in wire harness.
• Defective cylinder-#1 intake air pressure sensor.
• Malfunction in ECU.

03

14

Cylinder-#1 intake air pres-
sure sensor: hose system 
malfunction (clogged or 
detached hose).

• Cylinder-#1 intake air pressure sensor hose is detached, 

clogged, kinked, or pinched.

• Malfunction in ECU.

03

15

Throttle position sensor: open 
or short circuit detected.

• Open or short circuit in wire harness.
• Defective throttle position sensor.
• Malfunction in ECU.
• Improperly installed throttle position sensor.

01

16

Stuck throttle position sensor 
detected.

• Stuck throttle position sensor.
• Malfunction in ECU.

01

21

Coolant temperature sensor: 
open or short circuit detected.

• Open or short circuit in sub-wire harness 2.
• Open or short circuit in wire harness.
• Defective coolant temperature sensor.
• Malfunction in ECU.

06

22

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

• Open or short circuit in wire harness.
• Defective intake air temperature sensor.
• Malfunction in ECU.

05

25

Cylinder-#2 intake air pres-
sure sensor: open or short 
circuit detected.

• Open or short circuit in wire harness.
• Defective cylinder-#2 intake air pressure sensor.
• Malfunction in ECU.

04

26

Cylinder-#2 intake air pres-
sure sensor: hose system 
malfunction (clogged or 
detached hose).

• Cylinder-#2 intake air pressure sensor hose is detached, 

clogged, kinked, or pinched.

• Malfunction in ECU.

04

30

Engine stops when an oil 
pressure drop is detected.

• Oil pressure dropped.

33

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

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

30

34

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

• Open or short circuit in sub-wire harness 1.
• Open or short circuit in wire harness.
• Malfunction in cylinder-#2 ignition coil.
• Malfunction in ECU.
• Malfunction in a component of ignition cut-off circuit system.

31

42

No normal signals are 
received from the speed sen-
sor.

• Open or short circuit in wire harness.
• Defective speed sensor.
• Malfunction in ECU.

07

43

ECU is unable to monitor the 
battery voltage (an open or 
short circuit in the line to the 
ECU).

• Open or short circuit in wire harness.
• Malfunction in ECU.

09

44

Error is detected while read-
ing or writing on EEPROM 
(CO adjustment value).

• Malfunction in ECU. (The CO adjustment value is not properly 

written on or read from the internal memory.)

60

 

 

 

 

 

 

 

Content   ..  63  64  65  66   ..