TOHATSU BFT75A Service Manual page 133

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TROUBLESHOOTING
WARNING BUZZER SOUNDS CONTINUOUSLY
• The warning buzzer can sound when the starter motor speed is extremely low, but the alert system/warning
system is normal if the buzzer stops sounding after starting the engine.
AND THE OVERHEAT INDICATOR LIGHT COMES ON OR BLINKS
1. MIL inspection
Check to see if the MIL stays on.
Does the MIL stay ON?
YES
NO
2. Outboard motor installation inspection
Inspect the outboard motor installation (transom height/tilt angle).
Is the outboard motor installation correct?
YES
NO
3. Water screen inspection
Stop the engine and check the water screen.
Is it blocked with foreign material?
YES
NO
4. Cooling water inspection
Check the cooling water with the engine idling.
Is the water flowing through the check port steadily?
YES
NO
5. Engine cool down procedure
Put the outboard motor into gear for a few minutes and let the engine cool down at idle speed.
Does the overheat indicator light go OFF and the buzzer stop sounding?
YES
NO
6. Thermostat inspection
Check the thermostat (page 11-12).
Is the thermostat normal?
YES
NO
7. Buzzer inspection
Turn the combination switch OFF.
Check for continuity between the ECM connector A
terminal and engine ground.
Is there continuity?
YES
NO
4-20
– Perform PGM-FI troubleshooting (page 5-16)
– GO TO STEP 2.
– GO TO STEP 3.
– Faulty outboard motor installation.
– Remove the foreign material.
– GO TO STEP 4.
– GO TO STEP 5.
– • Faulty water pump
• Blocked or damaged water passage
– Temporary failure (disappears)
– GO TO STEP 6.
– GO TO STEP 7.
– Replace the thermostat with a new one and recheck.
main wire harness side No.19 (Yellow/Green)
– Short in the wire harness between the
ECM and Buzzer.
– Replace the ECM with a new one and
recheck
ECM CONNECTOR A
MAIN WIRE HARNESS SIDE
BUZZ
(Yellow/Green)