TOHATSU BFT75A Service Manual page 129

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TROUBLESHOOTING
ALERT SYSTEM/WARNING SYSTEM TROUBLESHOOTING
• Perform the MIL initial check before starting the engine.
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.
When the warning buzzer keeps sounding after MIL initial check, refer to the following symptom chart and perform the
necessary troubleshooting.
If the symptom is not shown in the following symptom chart, perform a function test according to the following procedure:
– FUNCTION TEST USING THE Dr.H (page 4-17)
– FUNCTION TEST WITHOUT USING THE Dr.H (page 4-18)
SYMPTOM CHART
Condition
Combination switch ON
(MIL initial check)
2 sec. after turning the combination
switch ON
Normal operation
Low oil pressure
Overheat
MIL faulty
Abnormal charging
Water contamination
: OFF
: ON
When two or more problems occur the same time, the warnings for both problems are indicated together.
The prolonged buzzer sound takes precedence over the short buzzer sound.
Example: When problems occur with overheat and abnormal charging at the same time, the oil indicator light, and the alternator
indicator light all come on and the buzzer sounds continuously.
*1: The oil indicator light blinks when a problem with the EOP sensor occurs at the same time as a MIL malfunction.
*2: The overheat indicator light blinks when a problem with the ECT sensor occurs at the same time as a MIL malfunction.
4-16
Indicator light
Oil Overheat
indicator indicator
light light (Red)
(Green)
(for 2 sec.) (for 2 sec.)
*1 *2
MIL Alternator
(Red) indicator
light (Red)
(for 2 sec.)
Warning
buzzer
Sounds twice
Stop
Stop
Continuous
sound
Continuous
sound
Intermittent
sound
(Long beep)
Intermittent
sound
(Long beep)
Intermittent
sound
(Short beep)