Yamaha MX775 - DIAG CODE LIST

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ELECTRICAL
FUEL INJECTION SYSTEM
DIAG CODE LIST
DIAG Tool
Mode
Diag
Code
Item
What to dis-
play
Unit How to diagnosis
DIAG
MAP
Manifold
Absolute
Pressure sen-
sor
Manifold
Absolute
Pressure
psi
• Compare the sensor output value with
atmospheric absolute pressure (Exam-
ple: 14.7 psi) with engine stopped.
• Confirm the sensor output value on dis-
play changes while engine cranking.
(Manifold Absolute pressure changes
during cranking.)
IAT
Intake Air
Temperature
Sensor
Intake Air
Temperature
F
• Compare the sensor output value with
ambient air temperature. (with engine
cold)
• Confirm the sensor output value on dis-
play changes with heating or cooling sen-
sor alone.
ET
Engine Tem-
perature Sen-
sor
Engine Tem-
perature
F
• Compare the sensor output value with
ambient air temperature. (with engine
cold)
• Confirm the sensor output value on dis-
play changes with heating or cooling sen-
sor alone.
• Sensor resistance: 9.0–11.0 k (25 C)
TPS
Throttle Posi-
tion Sensor
Throttle Valve
position
%
• Confirm throttle position on FI diagnositc
tool display when throttle valve is fully
opened.
MX825V: 95–100 %
MX800V: 67–77 %
MX775V: 54–64 %
• Confirm throttle position on FI diagnositc
tool display when throttle valve is fully
closed.
MX825/800/775V: 0–5 %
• Confirm throttle position on display
changes smoothly with throttle valve
open and close.
O
2
O
2
sensor
Oxygen den-
sity
V—
RPM Engine rpm Engine rpm rpm —
HOUR
Engine run
hour
Engine run
hour
hr —