5-12
BF135A•BF150A
• QUICK REFERENCE CHART OF TROUBLESHOOTING BY SYSTEM
When the MIL does not come ON but the engine becomes faulty, refer to the following troubleshooting chart and check
the parts in the numbered order shown on the chart.
Idle Control System
Low Pressure Fuel Supply System
High Pressure Fuel Supply System
Check point
Low
Water
Low
Low
Vapor
pressure
pressure
pressure
fuel line
separator
fuel strainer
fuel pump
separator
Symptom
Ref. page
Engine does not start
3
1
2
4
Engine starts but stalls soon
3
1
2
4
Engine speed is not stable during idling and trolling,
1
2
or engine stalls.
Engine sometimes misfires or stalls soon
3
1
2
4
Engine stalls soon at hot restart of the engine.
1
Check point
Idle
IAC
Neutral
Vacuum
adjusting
screw
valve
switch
pipe
Symptom
Ref. page
Engine does not start
2
1
Engine starts but stalls soon
1
2
3
Engine speed is higher than the specified idle speed
3
2
1
after warm up.
Engine speed is higher than the specified trolling speed
3
4
1
2
after warm up.
Engine speed is lower than the specified idle speed
2
1
3
after warm up.
Engine speed is lower than the specified trolling speed
2
1
3
after warm up.
Engine speed is not stable during idling and trolling.
2
1
4
3
Check point
High
High
High
Fuel
Pressure
pressure
pressure
pressure
fuel line
fuel pump fuel strainer
injector
regulator
Symptom
Ref. page
Engine does not start
1
2
3
Engine starts but stalls soon
1
2
3
Engine speed is not stable during idling and trolling,
1
2
3
or engine stalls.
Engine speed does not rise
1
3
3
3
2
Engine sometimes misfires or stalls soon
1
3
2
3