ENGINE/DC CONTROL
PART 4
Section 4.5
Diagnostic Tests
Figure 146.
Figure 147.
Figure 148.
TEST 61 – CHECK OIL PRESSURE SWITCH
AND WIRE 86
Discussion
If the oil pressure switch contacts have failed in their closed
position, the engine will crank and start, however shutdown will
occur within about 5 (five) seconds. If the engine cranks and
starts, then shuts down almost immediately with a Shutdown-
Alarm Low Oil Pressure, the cause may be one or more of the
following:
•Low engine oil level.
•Low oil pressure.
•A defective oil pressure switch.
Procedure
1. Navigate to the Digital inputs display screen.
a. Press “ESC” until the main menu is reached.
b. Press the right arrow key until “Debug” is flashing.
c. Press “Enter”.
d. Press the right arrow key until “Inputs” is flashing.
e. Press “Enter”.
DEBUG
INPUTS
INPUTS 1 - 8:
1 0 1 1 0 0 0 1
Figure 149. The Home Page, Debug and Input Screens
f. Digital Input 2 is Wire 86 from the Low Oil Pressure
switch to the board. Refer to Figure 149.
g. Set the AUTO-OFF-MANUAL switch to the MANUAL
position.
h. Observe Input 2 for a change from “1” to “0”. A change
from “1” to “0” indicates that the control board sensed
the LOP switch change states. If the generator still
shuts down, replace controller.
i. If the input did change states, the oil pressure switch
is good. An intermittent oil pressure problem may still
be present and should be checked with a mechanical
gauge as in Step 4.
2. Check engine crankcase oil level.
a. Check engine oil level.
b. If necessary, add the recommended oil to the dipstick
FULL mark. DO NOT OVERFILL ABOVE THE FULL
MARK.
3. With oil level correct, try starting the engine.
a. If engine still cranks and starts, but then shuts down,
go to Step 4.
b. If engine cranks and runs normally, discontinue tests.
4. Do the following:
a. Disconnect Wire 86 and Wire 0 from the oil pressure
switch terminals. Remove the switch and install an oil
pressure gauge in its place.
Page 133
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