Yamaha F225F, Service Manual

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