Yamaha F400A 2022 - Checking the Fuel Pressure Sensor

Fuel control unit and component
5-32
e. Turn the main switch or power switch
to OFF.
f. Install the fuse cover.
Checking the fuel pressure sensor
Before checking the fuel pressure sensor,
make sure that there are no other problems in
the fuel system.
1. Check:
• Fuel pressure sensor (high-pressure fuel
pump)
• Fuel pressure sensor (direct injection
pump)
a. Stop the engine, and then disconnect
the fuel pressure sensor couplers “a”.
b. Turn the main switch or power switch
to ON, and then measure the fuel pres-
sure sensor input voltage.
A
B
C
Input voltage
12 V
High-pressure fuel pump fuse
“a”–Ground
A. Fuel pressure sensor (direct injection
pump [STBD])
B. Fuel pressure sensor (direct injection
pump [PORT])
C. Fuel pressure sensor (high-pressure fuel
pump)
Fuel pressure sensor (direct injec-
tion pump)
Input voltage
5 V
Orange (Or)–Black (B)
Fuel pressure sensor (high-pres-
sure fuel pump)
Input voltage
5 V
Orange (Or)–Black (B)
BOr
a
BOr
a
Or B
a