2-32
BF135A•BF150A
g. ALERT SYSTEM
• OIL ALERT SYSTEM
When the oil pressure switch (low pressure side) detects low oil pressure, the ECM receives the signal from the oil pres-
sure switch and decreases the engine speed gradually to 1,800 min
-1
(rpm). The warning buzzer sounds and the oil indi-
cator light goes OFF this time. When the problem is removed, the engine speed increases gradually and the engine is
restored to the normal running.
• OVERHEAT ALERT SYSTEM
When the ECM detects overheat by receiving the signal from the thermo sensor, it decreases the engine speed gradu-
ally to 1,800 min
-1
(rpm). The warning buzzer sounds and the overheat indicator light comes ON. When the problem is
not removed within 20 seconds, the ECM decreases the engine speed further until it stops. When the problem is removed
during this control, the ECM increases the engine speed gradually until the engine is restored to the normal running.
• ALTERNATOR WARNING SYSTEM
The IC regulator is equipped in the alternator to detect the disconnected sensor terminal, disconnected output terminal,
overcharge and undercharge when generation stops. When a problem is detected, the IC regulator turns the alternator
indicator lightON and the ECM sounds the warning buzzer (intermittent prolonged sound) by receiving the signal from
the IC regulator.
• FULL WATER (IN WATER SEPARATOR) WARNING SYSTEM
When the water level in the water separator is above the specified level, the water level sensor detects the condition and
transmits the signal to the ECM to sound the warning buzzer.
• MIL WARNING SYSTEM
The MIL indicator light comes ON and the buzzer sounds (intermittent prolonged sound) when the ECM detects a prob-
lem by its diagnostic function.
• WARNING SYSTEM
Condition
Indicator light
Warning indicator light
Warning buzzer
Oil indicator
Overheat
ACG
MIL
light (Green)
indicator
indicator
(Red)
light (Red)
light (Red)
Ignition switch ON (Initial check)
ON for 2 sec.
ON for 2 sec.
ON
ON for 2 sec.
Sounds twice
2 sec. after turning ignition switch ON
OFF
OFF
ON
OFF
Stop
Normal operation
ON
OFF
OFF
OFF
Stop
Engine oil pressure dropped
OFF
OFF
OFF
OFF
Continuous sound
Overheat
ON
ON
OFF
OFF
Continuous sound
MIL faulty
ON*1
OFF*2
OFF
ON
Intermittent
prolonged sound
Alternator faulty
ON
OFF
ON
OFF
Intermittent
prolonged sound
Water separator full
ON
OFF
OFF
OFF
Intermittent short
sound
When two or more problems occur simultaneously, warning for each problem is indicated simultaneously.
When a problem occurred simultaneously with the malfunction of the MIL:
*1: The oil indicator light blinks when a problem with the high pressure oil pressure switch is detected.
*2: The overheat indicator light blinks when a problem with the overheat sensor is detected.
The warning buzzer of the prolonged sound takes precedence over the short sound.
Example: When the problems with the alternator and full water separator are detected simultaneously, the warning
buzzer is the intermittent prolonged sound.
Example: When the overheat and a problem with the alternator are detected simultaneously, the warning buzzer is the
continuous sound.
