Section 5 – SR-2 Diagnostics
19 LOW ENGINE OIL PRESSURE
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Alarm Type
Shutdown Alarm in Diesel Mode
Log Alarm in Electric Mode
Associated Alarm
Codes
Alarm Code 31 Check Oil Pressure Switch
Component Description and Location
The oil pressure switch is located at the side of the oil filter housing.
Circuit Description
The low oil pressure switch circuit is a single wire circuit. The 20B wire connects the interface board 36 pin
connector J7 pin 28 to one side of the low oil pressure switch. The switch is not polarity sensitive and closes on
low oil pressure. The switch wires are routed in the Main Harness. The switch screw terminal is connected to the
sensor harness.
Component Description and Location
See Alarm Code 31 Check Oil Pressure Switch
Circuit Description
See Alarm Code 31 Check Oil Pressure Switch
How Alarm is Set
When running in diesel mode, Alarm Code 19 Low Engine Oil Pressure is set as a shutdown alarm if the oil
pressure is low for 30 seconds.
How Alarm is Cleared
This alarm is cleared manually.
Considerations
This alarm becomes a log alarm if the unit is switched to electric mode.
5-28
02 February 2005
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