Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Manual - part 66

7-10

Power supply to the fuel
injection system is not nor-
mal.

• Malfunction in the charging system. (Refer to “CHARGING SYS-

TEM” in CHAPTER 8.)

—

Faulty ECU memory. (When
this malfunction is detected in
the ECU, the fault code num-
ber might not appear on the
meter.)

• Malfunction in ECU. (The program and data are not properly

written on or read from the internal memory.)

—

Knock sensor: open or short
circuit detected.

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

—

Grip warmer: open or short
circuit detected.

• Open or short circuit in wire harness.
• Defective grip warmer.
• Malfunction in ECU.

Thumb warmer: short circuit
detected.

• Short circuit in wire harness.
• Defective thumb warmer.
• Malfunction in ECU.

Conditions requiring T.O.R.S.
operation are detected.

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

01
07
24

Oil pressure switch: open cir-
cuit detected.

• Open circuit in wire harness.
• Defective oil pressure switch.
• Malfunction in ECU.

—

Drive position switch: short
circuit detected.

• Short circuit in gear motor sub-wire harness.
• Short circuit in wire harness.
• Defective drive position switch.
• Malfunction in ECU.
• Improperly installed drive position switch.

—

Reverse position switch:
short circuit detected.

• Short circuit in gear motor sub-wire harness.
• Short circuit in wire harness.
• Defective reverse position switch.
• Malfunction in ECU.
• Improperly installed reverse position switch.

Er-1

No signals are received from
the ECU.

• Open or short circuit in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.
• Defective wire connection of the ECU coupler.

—

Er-2

No signals are received from
the ECU within the specified
duration.

• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.

—

Er-3

Data from the ECU cannot be
received correctly.

• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.

—

Er-4

Non-registered data has been
received from the meter.

• Improper connection in wire harness.
• Malfunction in speedometer unit.
• Malfunction in ECU.

—

Fault

code No.

Symptom

Probable cause of malfunction

Diagnostic code No.

7-11

FUEL INJECTION SYSTEM

Diagnostic mode table
Switch the meter display from the regular mode to the diagnostic mode. To switch the display, refer to “DIAG-
NOSTIC MODE”.

NOTE:

• Check the intake air temperature and coolant temperature as close as possible to the intake air temperature

sensor and the coolant temperature sensor respectively.

• If it is not possible to check the intake air temperature, use the ambient temperature as reference.

Diagnostic

code No.

Item

Description of action

Data displayed on meter

(reference value)

Throttle angle

Displays the throttle angle.
• Check with throttle fully closed.
• Check with throttle fully open.

0 ~ 125 degrees
• Fully closed position (15 ~ 18)
• Fully open position (95 ~ 100)

Pressure difference
(atmospheric pressure and
cylinder-#1 intake air pres-
sure)

Displays the pressure difference (atmospheric pressure
and cylinder-#1 intake air pressure).
• Generate the pressure difference by cranking the

engine with the starter, without actually starting the
engine.

• Not cranking: atmospheric

pressure

• Cranking: intake air pressure

decreases to less than the
atmospheric pressure.

Pressure difference
(atmospheric pressure and
cylinder-#2 intake air pres-
sure)

Displays the pressure difference (atmospheric pressure
and cylinder-#2 intake air pressure).
• Generate the pressure difference by cranking the

engine with the starter, without actually starting the
engine.

• Not cranking: atmospheric

pressure

• Cranking: intake air pressure

decreases to less than the
atmospheric pressure.

Intake air temperature

Displays the intake air temperature.
• Check the temperature in the air filter case.

Compare it to the value dis-
played on the meter. (Minimum
displayed value: –30 [°C])

Coolant temperature

Displays the coolant temperature.
• Check the temperature of the coolant.

Compare it to the value dis-
played on the meter. (Minimum
displayed value: –30 [°C])

Vehicle speed pulse

Displays the cumulative number of vehicle pulses that
are generated when the tire is spun.

(0 ~ 999; resets to 0 after 999)
OK if the numbers appear on
the meter.

Fuel system voltage (bat-
tery voltage)

Displays the fuel system voltage (battery voltage).

0 ~ 18.7 V
Normally, approximately 12.0 V

Throttle switch

Displays that the switch is on or off.

Throttle open: on
Throttle closed: off

Grip warmer operation

Operates the grip warmer and displays the self-diagno-
sis warning indicator 1 second after the grip warmer side
of the grip/thumb warmer adjustment switch is pushed.
The grip warmer operates and the self-diagnosis warn-
ing indicator remains on for 120 seconds.
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

—

Thumb warmer operation

Operates the thumb warmer and displays the self-diag-
nosis warning indicator 1 second after the grip warmer
side of the grip/thumb warmer adjustment switch is
pushed.
The thumb warmer operates and the self-diagnosis
warning indicator remains on for 120 seconds.
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

—

7-12

FUEL INJECTION SYSTEM

Cylinder-#1 ignition coil

Actuates the cylinder-#1 ignition coil five times at 1-sec-
ond intervals and displays the self-diagnosis warning
indicator 1 second after the grip warmer side of the grip/
thumb warmer adjustment switch is pushed.
Connect an ignition checker.
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the spark five times.

Cylinder-#2 ignition coil

Actuates the cylinder-#2 ignition coil five times at 1-sec-
ond intervals and displays the self-diagnosis warning
indicator 1 second after the grip warmer side of the grip/
thumb warmer adjustment switch is pushed.
Connect an ignition checker.
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the spark five times.

Injector #1

Actuates injector #1 five times at 1-second intervals and
displays the self-diagnosis warning indicator 1 second
after the grip warmer side of the grip/thumb warmer
adjustment switch is pushed.
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the operating sound of the
injector five times.

Injector #2

Actuates injector #2 five times at 1-second intervals and
displays the self-diagnosis warning indicator 1 second
after the grip warmer side of the grip/thumb warmer
adjustment switch is pushed.
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the operating sound of the
injector five times.

Fuel injection system relay

Actuates the fuel injection system relay five times at 1-
second intervals and displays the self-diagnosis warning
indicator 1 second after the grip warmer side of the grip/
thumb warmer adjustment switch is pushed. (The indica-
tor is off when the relay is on and it is on when the relay
is off.)
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the operating sound of the fuel
injection system relay five
times.

Radiator fan motor relay

Actuates the radiator fan motor relay for five cycles of 5
seconds and displays the self-diagnosis warning indica-
tor 1 second after the grip warmer side of the grip/thumb
warmer adjustment switch is pushed. (The relay is on for
2 seconds and off for 3 seconds.)
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the operating sound of the radi-
ator fan motor relay five times.
(At that time, the fan motor
rotates.

Diagnostic

code No.

Item

Description of action

Data displayed on meter

(reference value)

7-13

FUEL INJECTION SYSTEM

Headlight relay

Actuates the headlight relay for five cycles of 5 seconds
and displays the self-diagnosis warning indicator 1 sec-
ond after the grip warmer side of the grip/thumb warmer
adjustment switch is pushed. (The relay is on for 2 sec-
onds and off for 3 seconds.)
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the operating sound of the
headlight relay five times.
(At that time, the headlight and
taillight come on.)

Passenger grip warmer
relay

Actuates the passenger grip warmer relay for five cycles
of 5 seconds and displays the self-diagnosis warning
indicator 1 second after the grip warmer side of the grip/
thumb warmer adjustment switch is pushed. (The relay
is on for 2 seconds and off for 3 seconds.)
This operation is performed each time the grip warmer
side of the switch is pushed. However, if the grip warmer
side of the switch is pushed again while the operation is
being performed, the operation will stop immediately and
restart from the beginning.

After pushing the switch, check
the operating sound of the pas-
senger grip warmer relay five
times.

EEPROM fault code dis-
play

• Displays the cylinder number if an error is detected in

the EEPROM CO adjustment value for the cylinder as
fault code No. 44.

• If both cylinders are defective, the display alternates

every 2 seconds.

(01 ~ 02) Displays the cylinder
number.
(00) Displays when there is no
malfunction.

Malfunction history code
display

• Displays the code numbers of past malfunctions (i.e., a

code number of a malfunction that occurred once and
which has been corrected).

• If more than one code number is detected, the display

alternates every 2 seconds to show all the detected
code numbers. When all code numbers are shown, the
display repeats the same process.

11 ~ 85
(00) Displays when there is no
malfunction.

Malfunction history code
erasure

• Displays the total number of codes that are being

detected through self diagnosis and the fault codes in
the past history.

• Erases only the history codes when the grip warmer

side of the grip/thumb warmer adjustment switch is
pushed.

00 ~ 24
(00) Displays when there is no
malfunction.

Control number

• Displays the program control number.

00 ~ 255

Diagnostic

code No.

Item

Description of action

Data displayed on meter

(reference value)

Content .. 64 65 66 67 ..