Yamaha RS90GTZ Service Manual page 342

Diagnostic mode table
Switch the meter display from the regular mode to the diagnostic mode. To switch the display, refer
to "DIAGNOSTIC MODE".
TIP
• 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
Item
code No.
Throttle angle
d:01
Intake air pressure
sensor 1 (atmospheric
d:03 pressure and intake air
pressure)
Intake air pressure
sensor 2 (atmospheric
d:04 pressure and intake air
pressure)
Intake air temperature
d:05
Coolant temperature
d:06
Snowmobile speed
d:07 pulse
Fuel system voltage
d:09
(battery voltage)
Throttle switch
d:24
Thumb warmer opera-
tion
d:27
Cylinder-#1 ignition coil If the grip warmer side of the grip/thumb warmer
d:30
Cylinder-#2 ignition coil If the grip warmer side of the grip/thumb warmer
d:31
FUEL INJECTION SYSTEM
Description of action
Displays the throttle angle.
• Check with throttle fully closed.
• Check with throttle fully open.
Displays the intake air pressure for cylinders #1,
#2, and #3.
• Check the intake manifold pressure.
• Push the starter switch and check the change
in the intake air pressure.
Displays the intake air pressure for cylinder #1.
• Check the intake manifold pressure.
• Push the starter switch and check the change
in the intake air pressure.
Displays the intake air temperature.
• Check the temperature in the intake manifold.
Displays the coolant temperature.
• Check the temperature of the coolant.
Displays the cumulative number of snowmobile
pulses that are generated when the track is
spun.
Displays the fuel system voltage (battery volt-
age).
Displays that the switch is on or off.
• Check the throttle switch.
If the grip warmer side of the grip/thumb warmer
adjustment switch is pushed, actuates the thumb
warmer and displays the self-diagnosis warning
indicator for 120 seconds.
adjustment switch is pushed, actuates the cylin-
der-#1 ignition coil and displays the self-diagno-
sis warning indicator (five times at one-second
intervals).
adjustment switch is pushed, actuates the cylin-
der-#2 ignition coil and displays the self-diagno-
sis warning indicator (five times at one-second
intervals).
7-15
FI
Checking method
or meter display
0 ~ 125 degrees
• Fully closed position (15 ~
18)
• Fully open position (94 ~
100)
• Not cranking: atmospheric
pressure
• Cranking: intake air pres-
sure decreases to less than
the atmospheric pressure.
• Not cranking: atmospheric
pressure
• Cranking: intake air pres-
sure decreases to less than
the atmospheric pressure.
Compare it to the value dis-
played on the meter. (Mini-
mum displayed value: –30
[°C])
Compare it to the value dis-
played on the meter. (Mini-
mum displayed value: –30
[°C])
(0 ~ 999; resets to 0 after 999)
OK if the numbers appear on
the meter.
0 ~ 18.7 V
Normally, approximately 12.0 V
Throttle open: on
Throttle closed: off
After pushing the switch,
check that the warmer
becomes warm.
After pushing the switch,
check that a spark is produced
five times.
After pushing the switch,
check that a spark is produced
five times.