ENGINE CONTROL SYSTEM 3-25
OVERHEAT CAUTION SYSTEM
CONDITION 1 (Maximum temperature)
Immediate activation of the system when:
• Cylinder temperature reaches 111°C.
• Exhaust manifold temperature reaches 101°C.
CONDITION 2 (Temperature rise vs Time)
Immediate activation of the system when:
• The average temperature difference during three consecutive 10 seconds measurement periods of the
cylinder temperature sensor at engine speeds of 500 r/min or higher exceeds the limits as shown below.
• The average temperature difference during three consecutive 10 seconds measurement periods of the
exhaust manifold temperature sensor at engine speeds of 500 r/min or higher exceeds the limits as shown
below.
Temperature range Temperature difference
86 °C – 99 °C
Approx. 2.2 °C
99 °C –
Approx. 0.6 °C
Temperature range Temperature difference
80 °C – 95 °C
Approx. 9.6 °C
95 °C –
Approx. 1.4 °C
RESET:
Close the throttle to reduce the engine speed below approx. 3000 r/min.
When the 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. 73 °C
Approx. 65 °C
Condition 2
(Temperature rise vs Time)
Engine speed
Caution lamp
Caution buzzer
Automatically reduced to approx. 3000 r/min by intermittent fuel injection and ignition
signals if the system is activated at 3000 r/min or higher.
“TEMP” lamp lights continuously.
“REV- LIMIT” lamp lights continuously during engine speed rev-limiter activation.
Sounds in a series of long (1.5 sec) beeps.
ACTION:
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