TP-6519 8/17 67Section 5 Component Testing and Adjustment
5.10.2 Fault Shutdown Switches
Check the low oil pressure and high engine temperature
shutdown switches on the engine by performing the
following tests. If the sensor does not function as
described, replace it.
Hazardous voltage. Moving parts.
Will cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
DANGER
Servicing the generator set when it is operating. Exposed
moving parts will cause severe injury or death. Keep
hands, feet, hair, clothing, and test leads away from the belts
and pulleys when the generator set is running. Replace
guards, screens, and covers before operating the generator
set.
Short circuits. Hazardous voltage/current will cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage. Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
Temperature Sensor (CTS)
The coolant temperature sensor (CTS) is used to
monitor engine temperature for the high engine
temperature fault shutdown (HE). See Figure 5-28 for
the coolant temperature sensor location. Set the
generator set master switch to the OFF position and
allow the generator set to cool. Disconnect the CTS and
use an ohmmeter to measure the resistance across the
sensor. The sensor resistance varies with temperature
and should be within the values shown in Figure 5-29. If
the resistance is very low (indicated a short circuit) or
very high (indicating an open circuit) replace the CTS.
Note: The CTS switch is located in the engine oil pan.
Drain the engine oil before removing the switch.
1
GM51561A
1. CTS location
Figure 5-28 CTS Location
Temperature, _C(_F)
Resistance, Ohms
30 (86) 2100--2400
100 (212) 180--200
Figure 5-29 Coolant Temperature Sensor Resistance
Readings
Low Oil Pressure (LOP) Switch
The low oil pressure (LOP) switch is located under the
engine air cleaner. See Figure 5-30.
1
tp6519
1. Oil pressure switch
Figure 5-30 Oil Pressure Switch Location (under the
air cleaner)
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