ENGINE CONTROL SYSTEM 3-24
OVERHEAT CAUTION
CONDITION 1 (Maximum temperature)
Immediate activation of system when :
(a) Cylinder temperature reaches 121°C
(b) Exhaust manifold temperature reaches 121°C
CONDITION 2 (Temp. rise Vs Time)
Immediate activation of system when :
(a) The average temperature difference during three consecutive 10 second measurement periods of the
cylinder temperature sensor at engine speeds of 500 r/min or higher exceeds the limits as shown below.
(b) The average temperature difference during three consecutive 10 second measurement periods of the
exhaust manifold temperature sensor at engine speeds of 500 r/min or higher exceeds the limits shown
below.
ACTION :
Engine speed Automatically reduced to approx. 3000 r/min by intermittent fuel injection signal if the
system is activated at 3000 r/min or higher.
Caution lamp “TEMP” lamp lights continuously.
“REV- LIMIT” lamp lights continuously during engine speed limiter activation.
Caution buzzer Sounds in a series of long (1.5 sec.) beeps.
Temperature range Temperature difference
60 °C ~ 94 °C 1.6 °C
95 °C ~ 0.9 °C
Temperature range Temperature difference
80 °C ~ 94 °C 14.4 °C
95 °C ~ 1.4 °C
RESET :
Close throttle to reduce engine speed below approx. 3000 r/min.
When cylinder temperature drops below the limits as shown below, the system resets. However, the system
may be activated again unless the cause for overheat (such as insufficient water) is removed.
Caution cause Reset temperature
Condition 1
(Maximum temperature)
Approx. 65 °C
Approx. 70 °C
Condition 2
(Temperature rise Vs Time)
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