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Yamaha F400A 2022 - Page 199

Yamaha F400A 2022
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Outboard motor troubleshooting
4-26
Symptom 1: Engine will not start (engine cranks).
Symptom 2 Cause Checking steps
See
page
Engine ECM does
not operate
Blown fuse Check the fuse. 5-10
Main relay malfunction
Check the electrical management
box.
5-19
Short, open, or loose con-
nection in the engine ECM
circuit
Check for wire harness continuity
between the electrical manage-
ment box and the engine ECM.
A-10
Check for continuity between the
engine ECM and ground.
5-19
Engine ECM ID and Digital
Electronic Control ECM ID
do not match.
Reset the Digital Electronic Control
system using the YDIS.
Engine ECM malfunction Replace the engine ECM. 7-37
Extension wire harness
malfunction
Check the extension wire harness
for continuity.
5-50
Spark plug does not
produce a spark (all
cylinders)
Crankshaft position sen-
sor malfunction
Measure the crankshaft position
sensor input voltage.
5-35
Short, open, or loose con-
nection in the pulser coil
circuit
Check the wire harness continuity
between the crankshaft position
sensor and the engine ECM.
A-12
Y-COP is locked Unlock Y-COP.

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