Yamaha F400A 2022 - Checking the Oil Pressure Sensor; Checking the Water Pressure Sensor

Engine control unit and component
5-26
h. Disconnect the battery leads.
i. Install new gaskets and OCVs, and
then connect the OCV couplers.
Checking the oil pressure sensor
1. Check:
• Oil pressure sensor
a. Disconnect the oil pressure sensor
coupler “a”.
b. Turn the main switch or power switch
to ON, and then measure the input volt-
age at the oil pressure sensor coupler.
c. Remove the oil pressure sensor, and
then connect a pressure pump “1” and
the special service tool “2”.
d. Apply positive pressure to the oil pres-
sure sensor slowly, and then measure
the output voltage at the specified
pressures.
e. Turn the main switch or power switch
to OFF, and then disconnect the spe-
cial service tool and pressure pump.
Checking the water pressure sensor
1. Check:
• Water pressure sensor
a. Disconnect the water pressure sensor
coupler “a”.
b. Turn the main switch or power switch
to ON, and then measure the input volt-
age at the water pressure sensor cou-
pler.
Input voltage
5 V
Orange (Or)–Black (B)
BOr
a
Pressure pump “1”
(commercially available)
Test harness EJ–ll–3 “2”
90890-06913
Output voltage at 392 kPa (3.92
kgf/cm², 56.8 psi)
2.5 V
Output voltage at 784 kPa (7.84
kgf/cm², 113.7 psi)
4.5 V
Pink/Blue (P/L)–Black (B)
P/L
Or
B
BG/W G
2
2
1
BOr
a