Yamaha F225F Service Manual page 155

Symptom 1: Engine will not start (engine cranks).
Symptom 2
Engine ECM does not
operate
Spark plug does not
spark (all cylinders)
Cause
Main relay malfunction
Blown fuse
Short, open, or loose connec-
tion in engine ECM circuit
Engine ECM ID and Digital
Electronic Control ECM ID do
not match.
Engine ECM malfunction
Extension wiring harness mal-
function
—
Spark plug malfunction
Short, open, or loose connec-
tion in ignition coil circuit
Troubleshooting the power unit
Checking step
Check the main relay.
Check the fuse.
Check for wiring continuity between the
main relay and engine ECM.
Check for wiring continuity between the
engine ECM and ground.
Digital Electronic Control system reset
using the YDIS.
Replace the engine ECM.
Check the extension wiring harness con-
tinuity.
Check the ignition spark.
Check the spark plug.
Check the ignition coil input voltage.
Check for wiring continuity between the
ignition coil and engine ECM.
Check for wiring continuity between the
ignition coil and main relay.
Check for wiring continuity between the
ignition coil and ground.
See
page
0
5-22
A-3
5-3
A-3
1
5-23
A-3
5-23
A-3
2
3-29
7-32
3
5-65
5-45
7-48
4
5-46
5-46
A-7
5-46
5
A-7
5-46
A-7
6
7
8
9
10
A
4-30