Yamaha F150A Service Manual

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4-6Outboard motor troubleshootingOutboard motor troubleshootingTroubleshooting procedure1. Before troubleshooting the outboard motor, check that fresh fuel of the specified type has beenused.2. Check that all electrical connections are secure and free from corrosion, and that the battery isfully 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 data graph aswell.5. If a trouble code is not detected, check the power unit according to “Troubleshooting the powerunit (trouble code not detected)” (4-11).6. Before using the YDIS to check the power unit, check the engine ECM circuit. See “Checkingthe engine ECM circuit” (5-14).TIP:• When deleting the diagnosis record on the YDIS, make sure to check the time that the troublecodes were detected.• When checking the input voltage of a part, the coupler or connector must be disconnected. As aresult, 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 isturned to OFF, the power of the engine ECM cannot be turned off. Therefore, if the engine startswitch is turned to ON within 10 seconds after it was turned to OFF, the trouble codes cannot bedeleted.Troubleshooting the power unit using the YDIS1. Use the trouble codes displayed by the YDIS to check each part according to the “Trouble codeand checking step” table.2. Delete the trouble codes after checking, repairing, or replacing a part and check that the troublecodes are not detected again. If the same trouble codes are detected, the engine ECM may befaulty.3. Check the items listed in the table. If all of the items are in good condition, delete the troublecodes, and then check the trouble codes again. If the same trouble codes are detected again,the engine ECM is faulty.