TOHATSU BFT250A Service Manual page 110

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TROUBLESHOOTING
4. Main relay inspection
Inspect the main relay (page 10-11).
Is the main relay normal?
YES
NO
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
NO
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
Combination switch ON
(MIL initial check)
2 sec. after turning the
combination switch ON
Normal operation
Low oil pressure
(page 4-23)
Overheat (page 4-22)
MIL faulty (page 4-24)
Abnormal charging
(page 4-24)
Water contamination
(page 4-24)
: 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 (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.
4-18
– GO TO STEP 5.
– Replace the main relay with a new one and
recheck.
– Repair the open circuit in the main wire
harness.
– Replace the fuse/relay junction box and
recheck.
Oil
indicator
light
(Green)
(for 2 sec.)
*1
: OFF
Indicator light
Overheat
MIL
indicator
(Red)
light (Red)
(for 2 sec.) (for 2 sec.)
*2
Warning
Alternator
indicator buzzer
light (Red)
Sounds twice
Stop
Stop
Continuous
sound
Continuous
sound
Intermittent
sound
(Long beep)
Intermittent
sound
(Long beep)
Intermittent
sound
(Short beep)