Outboard motor troubleshooting
4-4
Outboard motor troubleshooting
Troubleshooting procedure
1. Before troubleshooting the outboard motor, check that fresh fuel of the specified type has been
used.
2. Check that all electrical connections are secure and free from corrosion, and that the battery is
fully charged.
3. Check the trouble code using the YDIS first, and then check the electronic control system follow-
ing the trouble code chart.
4. When a trouble code is detected, check the data logger of the engine ECM record graph as well.
5. If a trouble code is not detected, check the power unit according to “Troubleshooting the power
unit” (4-25).
6. Before using the YDIS to check the power unit, check the engine ECM circuit. See “Checking the
engine ECM circuit” (5-19).
• When deleting the diagnosis record on the YDIS, make sure to check the time that the trouble codes
were detected.
• When checking the input voltage of a part, the coupler or connector must be disconnected. As a
result, the engine ECM determines that the part is disconnected and a trouble code is detected.
Therefore, make sure to delete the diagnosis record after checking the input voltage.
• Since the main relay comes on for approximately 10 seconds after the engine start switch is turned
to OFF, the power of the engine ECM cannot be turned off. Therefore, if the engine start switch is
turned to ON within 10 seconds after it was turned to OFF, the trouble codes cannot be deleted.
• When the battery is fully charged, the voltage value at low engine speed may fluctuate due to the
influence of voltage control.
Troubleshooting the power unit using the YDIS
1. Use the trouble codes, displayed by the YDIS, to check each part according to the table of “Trou-
ble code and checking step” (4-8).
2. Delete the trouble codes after checking, repairing, or replacing a part and check that the trouble
codes are not detected again. If the same trouble codes are detected, the engine ECM may be
faulty.
3. Check the items listed in the table. If all of the items are in good condition, delete the trouble
codes, and then check the trouble codes again. If the same trouble codes are detected again, the
engine ECM is faulty.
When using a K-Line connection, trouble codes for code number 300 and higher are not displayed.
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