TP-6391 9/08 53Section 5 Component Testing and Adjustment
Overcrank Shutdown
Disconnect the starter motor lead at the starter solenoid.
Move the controller master switch to the RUN position.
Observe that the generator set simulates cranking for
7 seconds and then rests for 15 seconds. Check that the
generator set shuts down after the third crank/rest cycle.
High Engine Temperature Shutdown
Remove the connector from the coolant temperature
sensor (CTS). Attempt to start the generator set by
moving the master switch to the RUN position. The unit
should not start and the ADC control should display fault
code EC58. Move the master switch to the OFF position.
Connect a jumper wire across terminals A and B of the
connector, shorting the wires. Attempt to start the
generator set by moving the master switch to the RUN
position. The unit should s tart and run but the ADC
control should display warning code EC59. Move the
master switch to the OFF position.
If available, insert a resistor (100--120 Ohm) into the
CTS connector. Attempt to start the generator set by
moving the master switch to the RUN position. Shortly
after ignition, the unit should shut down and the ADC
control should display fault code HE. Move the master
switch to the OFF position.
Replace the CTS connector onto the coolant
temperature sensor.
5.10.2 Fault Shutdown Switches
Check the low oil pressure and high engine temperature
shutdown s witches on the engine by performing the
following tests. If the sensor does not function as
described, replace it.
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
Servicing the generator set when it is operating. Exposed
moving parts can 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 can 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 5-11 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 5-10. If
the resistance is very low (indicating a short circuit) or
very high (indicating an open circuit) replace the CTS.
Temperature, _C
(_F)
Sensor Resistance,
Ohms
Signal
Voltage
100 (212) 177 0.75
90 (194) 241 0.97
80 (176) 332 1.25
70 (158) 467 1.59
60 (140) 667 2.00
50 (122) 973 2.47
40 (104) 1459 2.97
30 (86) 2238 3.46
20 (68) 3520 3.89
10 (50) 5670 4.25
--40 (--40) 100700 4.95
Figure 5-10 Coolant Temperature Sensor Resistance
Readings
1
GM39685D-J
1. Coolant temperature sensor (CTS)
Figure 5-11 Coolant Temperature Sensor (CTS)
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