Yamaha F150B - Page 111

4-6
Troubleshooting the power unit
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Trouble code and checking step Description in < > is relevant to the twin and triple engine installation. —: Not applicable
Trouble
code
Item Condition
Lan gauge
display
Symptom Remarks Checking steps
Refer to
page
13 Pulser coil mal-
function
Irregular signal C/E Higher idle speed
—
1. Measure the pulser coil out-
put peak voltage.
5-30
2. Measure the pulser coil
resistance.
5-30
3. Check for wiring continuity
between the pulser coil and engine ECM.
5-30
A-5
4. Check the projections of the
plate for damage.
7-17
15 Engine temp sen-
sor malfunction
Out of specifica- tion
C/E Higher idle speed
Degraded acceleration performance Declining maximum engine speed
—
1. Measure the engine temper-
ature sensor input voltage.
5-33
A-5
2. Measure the engine temper-
ature sensor resistance.
5-33
3. Check for wiring continuity
between the engine temper- ature sensor and engine ECM.
5-33
A-5
18 Throttle position
sensor malfunc- tion
Out of specifica- tion
C/E Higher idle speed
Degraded acceleration performance Declining maximum engine speed
—
1. Check the TPS using the
YDIS.
5-16
2. Measure the TPS input volt-
age.
5-16
A-5
3. Check for wiring continuity
between the TPS and engine ECM.
5-16
A-5
4. Adjust the TPS. 6-21