ENGINE CONTROL SYSTEM 3-37
OVERHEAT CAUTION
CONDITION 1 (Maximum temperature)
Immediate activation of system when:
• Cylinder temperature reaches 120 °C (248 °F)
• Exhaust manifold temperature reaches 114 °C (237.2 °F)
CONDITION 2 (Temp. rise vs Time)
Immediate activation of system when:
• The average temperature difference during three consecutive 10 second measurement periods of the cyl-
inder 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 second measurement periods of the
exhaust manifold temperature sensor at engine speeds of 500 r/min or higher exceeds the limits as
shown below.
ACTION:
RESET:
Close throttle completely and then shift into neutral.
System reset will occur when cylinder temperature drops below the limits shown below. However, the sys-
tem may be activated again unless the cause for overheat (such as insufficient water) is removed.
Temperature range Temperature difference
88 – 99 °C (190 – 210 °F) Approx. 8 °C (46 °F)
99 °C – (210 °F) Approx. 1.5 °C (35 °F)
Temperature range Temperature difference
80 – 95 °C (176 – 203 °F) Approx. 14 °C (57.2 °F)
95 °C – (203 °F) Approx. 1.7 °C (35 °F)
Engine speed Automatically reduced to approx. 3 000 r/min by intermittent fuel injection and ignition
signals if the system is activated at 3 000 r/min or higher.
Caution lamps “TEMP” lamp lights continuously.
“REV-LIMIT” lamp lights continuously during engine speed rev-limiter activation.
Caution buzzer Sounds in a series of long (1.5 sec) beeps.
Caution cause Reset temperature
Condition 1
(Maximum temperature)
Approx. 78 °C (172 °F)
Condition 2
(Temperature rise vs Time)
Approx. 76 °C (169 °F)
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