Yamaha YXR70FX Service Manual page 280

Fault
Symptom
code No.
Faulty ECU memory. (When this mal-
function is detected in the ECU, the
50
fault code number might not appear
on the LCD of the meter.)
Sensor operation table
Diagnos-
tic code Item
No.
Throttle angle
d01 • Fully closed position
• Fully opened position
Pressure difference
d03 (atmospheric pressure
and intake air pressure)
Intake air temperature
d05
Coolant temperature
d06
Vehicle speed pulse
d07
Lean angle sensor
d08 • Upright
• Overturned
Fuel system voltage
d09 (battery voltage)
Gear position switch
d21 • Neutral
• In gear
EEPROM fault code dis-
play
d60
• No history
• History exists
Malfunction history code
display
• No history
• History exists
d61
Malfunction history code
erasure
• No history
d62
• History exists
d70 Control number
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Malfunction in ECU. (The program and data are not
properly written on or read from the internal memory.)
Meter display
15 ~ 20
95 ~ 100
Displays the intake air pressure.
Displays the intake air temperature.
Displays the coolant temperature.
0 ~ 999
3.7 ~ 4.4
0.4 ~ 1.4
Approximately 12.0
ON
OFF
00
01
00
Fault codes 12-50
• (If more than one code number is detected, the
display alternates every two seconds to show all
the detected code numbers. When all code num-
bers are shown, the display repeats the same pro-
cess.)
0
Up to 16 fault codes
00 ~ 255
6 - 10
FI
Diagnostic code No.
—
Checking method
Check with throttle fully closed.
Check with throttle fully open.
Operate the throttle while pushing the
start switch. (If the display value
changes, the performance is OK.)
Compare the actually measured
intake air temperature with the meter.
Compare the actually measured cool-
ant temperature with the meter.
Check that the number increases
when the rear wheel is rotated. The
number is cumulative and does not
reset each time the wheel is stopped.
Remove the lean angle sensor and
incline it more than 65 degrees.
Compare with the actually measured
battery voltage. (If the battery voltage
is lower, perform recharging.)
Shift the transmission.
—
—
—
To erase the history, set the differen-
tial gear lock switch to "4WD" and
then to "LOCK".
—