TOHATSU BFT 250A, Service Manual

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4-18
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TROUBLESHOOTING
4. Main relay inspection
Inspect the main relay (page 10-11).
Is the main relay normal?
YES – GO TO STEP 5.
NO – Replace the main relay with a new one and
recheck.
5. Fuse/relay junction box inspection
Inspect the main relay circuit into the fuse/relay
junction box (page 10-13).
Is the fuse/relay junction box normal?
YES – Repair the open circuit in the main wire
harness.
NO – Replace the fuse/relay junction box and
recheck.
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 HDS (page 4-19)
– FUNCTION TEST WITHOUT USING THE HDS (page 4-20)
SYMPTOM CHART
Condition Indicator light
Warning
buzzer
Oil
indicator
light
(Green)
Overheat
indicator
light (Red)
MIL
(Red)
Alternator
indicator
light (Red)
Combination switch ON
(MIL initial check) (for 2 sec.) (for 2 sec.) (for 2 sec.)
Sounds twice
2 sec. after turning the
combination switch ON
Stop
Normal operation Stop
Low oil pressure
(page 4-23)
Continuous
sound
Overheat (page 4-22) Continuous
sound
MIL faulty (page 4-24)
*1 *2
Intermittent
sound
(Long beep)
Abnormal charging
(page 4-24)
Intermittent
sound
(Long beep)
Water contamination
(page 4-24)
Intermittent
sound
(Short beep)
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 (High) switch occurs at the same time as a
MIL malfunction.
*2: The overheat indicator light blinks when a problem with the EMT sensor occurs at the same time as a
MIL malfunction.
: OFF : ON