Yamaha F150A - Troubleshooting the Power Unit (Trouble Code Not Detected)

4-11
Outboard motor troubleshooting
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Troubleshooting the power unit (trouble code not detected)
Troubleshooting consists of the following 3 items:
Symptom 1: Specific trouble conditions
Symptom 2: Trouble conditions of an area or individual part
Cause: Trouble causes of symptom 2
— : Not applicable
Symptom 1: Engine does not crank.
Symptom 1: Engine will not start (engine cranks).
Symptom 2 Cause Checking steps
See
page
Starter motor does not
operate
Gear shift not in the N position Set the gear shift to the N position. 10-7
Blown fuse Check the fuse. 5-3
Starter relay malfunction Check the starter relay. 5-27
Engine start switch malfunction Check the engine start switch. 5-28
Neutral switch malfunction Check the neutral switch. —
Short, open, or loose connec-
tion in starter motor circuit
Measure the starter relay input voltage. 5-27
Check the wiring harness for continuity.
A-6
A-8
Starter motor malfunction
Disassemble and check the starter
motor.
5-35
Starter motor operates,
but the engine does not
crank
Stuck piston or crankshaft Disassemble and check the power unit. 7-61
Stuck drive shaft
Check the drive shaft bushing. 9-18
Disassemble and check the lower unit.
8-19
8-60
Symptom 2 Cause Checking steps
See
page
Engine ECM does not
operate
Blown fuse Check the fuse. 5-3
Main relay malfunction Check the main relay. 5-13
Short, open, or loose connec-
tion in the engine ECM circuit
Check for wiring harness continuity
between the main relay and the engine
ECM.
A-2
Check for continuity between the engine
ECM and ground.
A-2
Spark plug does not pro-
duce a spark
(all cylinders)
Pulser coil malfunction
Measure the pulser coil output peak volt-
age.
5-22
Measure the pulser coil resistance. 5-22
Short, open, or loose connec-
tion in the pulser coil circuit
Check for wiring harness continuity
between the pulser coil and the engine
ECM.
A-4
Y-COP is locked. Unlock Y-COP. 3-20