Troubleshooting The Power Unit (Trouble Code Not Detected) - Yamaha F150A Service Manual

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 2
Starter motor does not
operate
Starter motor operates,
but the engine does not
crank
Symptom 1: Engine will not start (engine cranks).
Symptom 2
Engine ECM does not
operate
Spark plug does not pro-
duce a spark
(all cylinders)
Cause
Gear shift not in the N position Set the gear shift to the N position.
Blown fuse
Starter relay malfunction
Engine start switch malfunction Check the engine start switch.
Neutral switch malfunction
Short, open, or loose connec-
tion in starter motor circuit
Starter motor malfunction
Stuck piston or crankshaft
Stuck drive shaft
Cause
Blown fuse
Main relay malfunction
Short, open, or loose connec-
tion in the engine ECM circuit
Pulser coil malfunction
Short, open, or loose connec-
tion in the pulser coil circuit
Y-COP is locked.
Outboard motor troubleshooting
Checking steps
Check the fuse.
Check the starter relay.
Check the neutral switch.
Measure the starter relay input voltage.
Check the wiring harness for continuity.
Disassemble and check the starter
motor.
Disassemble and check the power unit.
Check the drive shaft bushing.
Disassemble and check the lower unit.
Checking steps
Check the fuse.
Check the main relay.
Check for wiring harness continuity
between the main relay and the engine
ECM.
Check for continuity between the engine
ECM and ground.
Measure the pulser coil output peak volt-
age.
Measure the pulser coil resistance.
Check for wiring harness continuity
between the pulser coil and the engine
ECM.
Unlock Y-COP.
4-11
0
1
See
page
10-7
2
5-3
5-27
5-28
—
3
5-27
A-6
A-8
4
5-35
7-61
9-18
5
8-19
8-60
6
See
page
5-3
5-13
7
A-2
A-2
8
5-22
5-22
9
A-4
3-20
10
A