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Figure #31
The “
INITIALIZATION PATTERN
will flash. This is
normal. The continuous two (2) blink flash sequence
should turn off at this point.
Three (3) blinks – Engine Coolant Temperature
Sensor malfunction:
Status lamps will flash three
times continuously on the Clarke instrument panel
and a “Low Engine Coolant Temperature” alarm will
be sent to the fire pump controller via circuit #312.
Cause:
Engine coolant temperature sensor circuit is open or
shorted.
Corrective Actions:
Verify wiring and connector plug at engine coolant
temperature sensor are secure. Sensor is located on
top of engine on DP6H and DQ6H engine models
(Figure #32A)
, at the front of the engine near the
cylinder head on DR8H and DS0H models, and
behind engine heat exchanger as shown on DT2H
engine models (
Figure #32B
).
Figure #32A – DP6H & DQ6H engine models
Figure #32B – DR8H & DS0H models
Figure #32C – DT2H engine models
On the Clarke instrument panel, operate the
“OVERSPEED RESET” switch for four (4) seconds
and release. (Refer to
Figure #31
).
The
“INITIALIZATION PATTERN”
will flash. This
is normal. The continuous three (3) blink flash
sequence should turn off at this point.
If problem still exists, replace engine coolant
temperature thermistor.
Five (5) blinks on instrument panel – Oil pressure
switch or Engine speed sensor (magnetic pick-up)
malfunction:
Status lamps will flash five times
continuously on the Clarke instrument panel and a
“Low Engine Coolant Temperature” alarm will be
sent to the fire pump controller via circuit #312.
Cause:
Oil pressure switch failure or magnetic pick-up
failure.
Corrective Actions:
Oil Pressure switch check
Verify wiring and connector at engine oil pressure
switch are secure. Pressure switch is located on right
side of engine next to the flywheel housing on DP6H
