Electronic control system
2-8
Engine protection control
When engine overheating or low oil pressure is detected, the engine ECM controls fuel injection to pro-
tect the engine.
7. Engine
ECM
1. Pulser coil
3. Oil pressure switch
4. Engine start switch
5. Engine shut-off switch
6. Battery
2. Thermo sensor
11. Overheat alert indicator
12. Low oil pressure alert indicator
10. Alert buzzer
9. Fuel injector #2, #3
8. Fuel injector #1, #4
1. Pulser coil
2. Thermo sensor
3. Oil pressure switch
4. Engine start switch
5. Engine shut-off switch
6. Battery
7. Engine ECM
8. Fuel injector #1, #4
9. Fuel injector #2, #3
10. Alert buzzer
11. Overheat alert indicator
12. Low oil pressure alert indicator
Control name Condition Controls performed by ECM
Overheat con-
trol
Cooling water temperature is 80 C
(176 F) or
more after approximately 1
minute have elapsed since the engine
was started or after engine speed is
2000 r/min or more for more than
approximately 20 seconds.
Fuel injection will be controlled to limit
en
gine speed to approximately 2000
r/min.
The overheat alert indicator comes on,
an
d the alert buzzer sounds.
Control stops when the cooling water
te
mperature is less than 70 C (158
F).
Low oil pres-
sure control
The oil pressure switch is ON for a
specif
ied time after 5 seconds have
elapsed since the engine was started
with the engine speed more than 1000
r/min (the time required for judgement
varies depending on the cooling water
temperature, engine speed, and so
on).
Fuel injection will be controlled to limit
en
gine speed to approximately 2000
r/min.
The low oil pressure alert indicator
come
s on, and the alert buzzer
sounds.
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