TOHATSU BFT 250A, Service Manual

Page: 115 / 639

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TROUBLESHOOTING
THE OVERHEAT INDICATOR LIGHT GOES OFF AND OIL INDICATOR LIGHT GOES OFF OR BLINKS
1. MIL inspection
Check to see if the MIL stays on.
Does the MIL stay ON?
YES – Perform PGM-FI troubleshooting (page 5-6)
NO – GO TO STEP 2.
2. Oil level inspection
Stop the engine and check the oil level.
Is the oil level at the proper level?
YES – GO TO STEP 3.
NO – Adjust the oil level.
3. Oil indicator light inspection 1
Let the engine idle.
Check the oil indicator light and buzzer.
Does the oil indicator light come ON and warning buzzer stop sounding?
YES – GO TO STEP 4.
NO – GO TO STEP 5.
4. Oil indicator light inspection 2
Snap the engine (4,000 min -1 (rpm) or above under load) and check the oil indicator light and buzzer.
Does the oil indicator light come ON and warning buzzer stop sounding?
YES – Temporary failure (disappears)
NO – GO TO STEP 5.
5. Oil indicator light inspection 3
Disconnect the switch wire 6P connector .
Turn the combination switch ON and check the oil indicator light and buzzer.
Does the oil indicator light come ON and warning buzzer stop sounding?
YES – GO TO STEP 6.
NO – Short circuit in EOP switch (LOW) and ECM.
6. Oil Pressure inspection
Turn the combination switch OFF and connect the switch wire 6P connector .
Reset the ECM following:
– Using the HDS (page 5-6)
– Without using the HDS (page 5-6)
Check the oil pressure (page 12-12).
Is the oil pressure within specification?
YES – GO TO STEP 7.
NO – • Oil filter cartridge is clogged
• Oil strainer is clogged
• Faulty oil pump
• Oil passage is clogged
7. EOP (LOW) switch inspection
Replace the EOP (Low) switch.
Check the oil indicator light and buzzer.
Does the oil indicator light come ON and the buzzer stop sounding?
YES – Faulty original EOP (Low) switch.
NO – Replace the ECM with a new one and recheck.