TP-6805 8/15112 Section 6 Component Testing and Adjustment
shown in Figure 6-23. If the resistance is very low
(indicating a short circuit) or very high ( indicating an
open circuit), replace the CTS.
Note: Because the temperature sensor can be difficult
to reach, the resistance can be measured across
pins 9 and 10 on connector P1 at the generator
set controller, if desired. Disconnect P1 from the
controller before checking the resistance across
P1-9 and P1-10.
Note: The temperature sensor is located in the engine
oil pan. Drain the engine oil before removing the
switch.
Temperature, _C(_F)
Resistance, Ohms
30 (86) 2100--2400
100 (212) 180--200
Figure 6-23 Temperature Sensor OTS Resistance
Readings
Low Oil Pressure (LOP) Switch
The low oil pressure (LOP) switch is located under the
engine air cleaner. See Figure 6-24. The oil pressure
switch should be grounded when the engine is stopped
(no oil pressure) and open when the engine is running.
1
tp6519
1. Oil pressure switch
Figure 6-24 Oil Pressure Switch Location (under the
air cleaner)
Before testing the LOP switch, check the oil level and
add oil if necessary. Inspect the generator set engine for
evidence of oil leaks.
To test the LOP switch:
1. Press the OFF button to stop the engine.
2. Disconnect lead 13 from the switch.
3. Use an ohmmeter or continuity tester to verify that
the switch is closed (connected to the engine
block).
4. Start the engine and verify that the switch opens
after a few seconds.
If the LOP switch does not operate as described above,
use a gauge to check the oil pressure:
1. Press the OFF button to stop the engine.
2. Remove the LOP switch and install an oil pressure
gauge.
3. Start and run the generator set.
4. Verify that the engine oil p ressure is within the
range specified in Section 1, Specifications, before
replacing the LOP switch.
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