TOHATSU BFT75A Service Manual page 120

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7. Neutral switch inspection
Inspect the neutral switch (page 9-22)
Is the neutral switch normal?
YES
NO
8. Fuel injector inspection
Inspect the fuel injector (page 5-103)
Is the fuel injector normal?
YES
NO
9. Throttle body inspection
Inspect and clean the throttle body (page 5-105).
Is the throttle body normal?
YES
NO
10. Ignition system inspection
Check the ignition system (page 8-3).
Is the ignition system normal?
YES
NO
11. IAC valve inspection
Replace the IAC valve with a new one and start the engine.
Is the idle speed 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 stop?
YES
NO
2. Engine idle speed inspection
Adjust by turning the idle adjusting screw in or out (page 3-20).
Is the idle speed normal?
YES
NO
3. Pressure regulator inspection
Check the fuel pressure and record it (page 5-97)
Disconnect the pressure regulator vacuum tube.
Check the fuel pressure.
Is the fuel pressure higher with the vacuum tube disconnected?
YES
NO
– GO TO STEP 8.
– Faulty original neutral switch.
– GO TO STEP 9.
– • Repair the open or short circuit in the fuel injector wire
• Faulty fuel injector
– GO TO STEP 10.
– Clean or replace the throttle body (page 5-105).
– GO TO STEP 11.
– Faulty ignition system.
– Faulty original IAC valve.
– Replace the ECM with a new one and recheck.
– GO TO STEP 2.
– Perform alert system/warning system troubleshooting (page 4-16).
– Improperly adjusted idle adjusting screw.
– GO TO STEP 3.
– GO TO STEP 4.
– • Clogged pressure regulator vacuum tube
• Faulty pressure regulator
.
TROUBLESHOOTING
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