Section 2 – SR-2 Hardware Description
ENGINE CONTROL
COMPONENTS
These components are used by the microprocessor
to sense conditions and control operation of the
diesel engine (or electric motor, if present).
Coolant Temperature Sensor
This sensor monitors the temperature of the coolant
in the diesel engine. It is located on the diesel
engine thermostat housing and is connected to the
microprocessor via the J3 connector WTP and WTN
wires.
Coolant Level Sensor (CLS)
This sensor monitors the engine coolant level. It is
located on the radiator expansion tank. Two
different switches were used. All initial production
used an optical switch. SB units switched to a new
expansion tank and a magnetic reed switch during
the second quarter 2004. SL units use the optical
switch.
Optical Switch
The optical switch screws into the radiator
expansion tank. If the coolant level falls below the
sensor for a specified period of time a low coolant
condition is assumed to exist. The switch is
connected to the microprocessor connector J7 via
the CLS wire. 5 VDC power is supplied to the switch
from the microprocessor connector J7 via the CLP
and CLN wires. The switch is closed when the
sensor is immersed in coolant and open when
coolant level is below the sensor.
Magnetic Reed Switch
The magnetic reed switch consists of a press-in
miniature reed switch and a captive magnetic float
inside the radiator expansion tank. If the coolant
level is low for a specified period of time a low
coolant condition is assumed to exist. The switch is
connected to the microprocessor connector J7 via
the CLS and CLP wire. The switch is closed with
adequate coolant level and open with low coolant
level.
Oil Pressure Switch (LOPS)
The normally closed low oil pressure switch
monitors the oil pressure of the diesel engine. It is
located on the engine side of the unit frame. It is
connected to the microprocessor via J3 connector
20B and CH wires. The switch is open when the oil
pressure is adequate.
Oil Level Switch (OLS)
The normally open oil level switch monitors the oil
level in the diesel engine. It is located above the oil
pan on the door side of the engine. It supplies
information on the oil level to the microprocessor via
the J3 connector OLS wire. The switch is closed
when the oil level is low.
Flywheel Sensor (FW)
This sensor monitors the RPM of the diesel engine.
The flywheel sensor is located on the door side of
the engine just under the starter. It supplies engine
speed information to the microprocessor connector
J3 via the FS1 and FS2 wires.
2-26
31 January 2005
Summary of Contents for SR-2 SmartReefer2
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Page 7: ...Tab goes here and the next page should be GREEN Section 1 Safety...
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