Yamaha F400A 2022 - Page 184

4-11
Outboard motor troubleshooting
57
Starter magnet
power supply
(Irregular sig-
nal)
“Check Engine” is displayed.
Engine does not crank.
Starter motor cannot be
turned on or off.
Check the fuse. 5-10
Check for wiring open or short
between the engine start
switch and the engine ECM.
A-16
Check for wiring continuity
between the engine start
switch and the electrical man-
agement box.
A-16
Check for wiring open or short
between the electrical man-
agement box and the ground.
A-16
Check for wiring open or short
between the electrical man-
agement box and the engine
ECM.
A-16
Replace the electrical man-
agement box.
7-22
60
Generator sys-
tem (rectifier/
regulator)
“Check Engine” is displayed.
Degraded charging perfor-
mance.
Measure the crankshaft posi-
tion sensor input voltage.
5-35
Check for wiring continuity
between the rectifier/regulator
and the ECM.
A-16
71
Cam position
sensor (S bank
IN) (Irregular
signal)
“Check Engine” is displayed.
High engine idle speed.
Degraded acceleration perfor-
mance.
Declining maximum engine
speed.
<Engine speeds do not syn-
chronize>
Measure the cam position
sensor input voltage.
5-23
Measure the cam position
sensor output voltage.
5-23
Check for wiring continuity
between the cam position
sensor and the engine ECM.
A-10
Check the brim of the cam-
shaft.
7-50
72
Cam position
sensor (P bank
IN) (Irregular
signal)
“Check Engine” is displayed.
High engine idle speed.
Degraded acceleration perfor-
mance.
Declining maximum engine
speed.
<Engine speeds do not syn-
chronize>
Measure the cam position
sensor input voltage.
5-23
Measure the cam position
sensor output voltage.
5-23
Check for wiring continuity
between the cam position
sensor and the engine ECM.
A-10
Check the brim of the cam-
shaft.
7-50
Trou-
ble
code
Item (Condi-
tion)
Sy
mptom Checking steps
See
page