OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Engine Temperature Sensor/Warning
C-79 C-79
9803/9880-3
Engine Temperature Sensor/Warning
Operation
C028490GB-2
Fig 74.
The engine is fitted with a thermistor sensor and thermal
switch to measure the water temperature. The engine
temperature (in ºC) is sent from the ECM to the ECU1 via
the CAN bus. The temperature is displayed to the operator
by means of a bar graph gauge. The actual values can be
displayed via the EMS's SET+MODE menu.
– When the temperature rises to 101 ºC the water temp
LED is illuminated on the EMS.
– At above 130 ºC the operating mode changes to "E"
if in "A".
– At above 105 ºC the bar graph will flash on-off, the
audible alarm will sound, and the "WATER TEMP" will
be displayed on the EMS. The audible warning can be
cancelled by pressing ACK button on the EMS.
– At above 108 C the caution LED will illuminate and
"LOW POWER" will be displayed on the EMS. This
indicates that the ECM has limited engine output to
50% of maximum.
The over heat switch is included as a safety measure in
case of the thermistor failure. If this input is grounded then
the EMS will illuminate the water temp LED, the bar graph
will flash on-off, the audible alarm will sound, "WATER
TEMP" will be displayed on the EMS and the mode
changes to "E" if in "A". The audible warning can be
cancelled by pressing the "ACK" button on the EMS.
The engine water temperature bar graph gauge operates
as follows,
K
Table 3. ( T C-80).