TOHATSU BFT250A Service Manual page 99

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5. Alternator F line inspection
Inspect the alternator F line (page 4-9).
Is the alternator F line normal?
YES
NO
ENGINE SPEED IS HIGHER THAN THE SPECIFIED TROLLING SPEED AFTER WARMING UP
1. Alert system inspection
Turn the combination switch ON.
Check the warning buzzer sound.
Does the warning buzzer sound twice and then keep sounding?
YES
NO
2. Engine idle speed inspection
Check the idle speed (page 3-22).
Is the idle speed normal?
YES
NO
3. Neutral switch inspection
Inspect the neutral switch (page 9-20).
Is the neutral switch normal?
YES
NO
4. Pressure regulator inspection
Inspect the fuel pressure and record it (page 5-111).
Disconnect the pressure regulator vacuum tube.
Inspect the fuel pressure.
Is the fuel pressure higher with the vacuum tube disconnected?
YES
NO
5. IAC valve inspection
Replace the IAC valve with a new one and start the engine.
Is the trolling speed normal?
YES
NO
ENGINE SPEED IS LOWER THAN THE SPECIFIED IDLE SPEED OR TROLLING SPEED AFTER
WARMING UP
1. Alert system inspection
Turn the combination switch ON.
Check the warning buzzer sound.
Does the warning buzzer sound twice and then keep sounding?
YES
NO
– Replace the ECM with a new one and recheck.
– Replace the alternator with a new one and recheck.
– Perform alert/warning system troubleshooting (page 4-18).
– GO TO STEP 2.
– Improperly adjusted idle adjusting screw.
– GO TO STEP 3.
– GO TO STEP 4.
– Replace the neutral switch with a new one and recheck.
– GO TO STEP 5.
– Faulty pressure regulator.
– Faulty original IAC valve.
– Replace the ECM with a new one and recheck.
– Perform alert system/warning system troubleshooting (page 4-18).
– GO TO STEP 2.
TROUBLESHOOTING
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