Section 5 – SR-2 Diagnostics
31 CHECK OIL PRESSURE SWITCH
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Alarm Type
Log or Shutdown Alarm
Associated Alarm
Codes
Alarm Code 19 Low Engine Oil Pressure
Alarm Code 66 Low Engine Oil Level
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.
How Alarm is Set
1. If unit is in diesel mode but not running, the oil level is good, and the oil pressure switch is not indicating
low oil pressure, Alarm Code 31 Check Oil Pressure Switch is set as a Log alarm.
2. If unit is in diesel mode but not running, the oil level is not good, and the oil pressure switch is not indicating
low oil pressure, Alarm Code 31 Check Oil Pressure Switch is set as a Shutdown alarm.
3. If unit is running in electric mode and the oil pressure switch is not indicating low oil pressure, Alarm Code
31 Check Oil Pressure Switch is set as a Log alarm.
How Alarm is Cleared
This alarm is cleared manually.
Considerations
If this alarm is set as a Shutdown alarm in diesel mode operation, it becomes a log alarm if unit is switched to
electric mode operation.
If the alarm exists in electric mode and the unit is switched to diesel, either condition #1 or #2 in the “How Alarm is
Set” section above apply.
Diagnostic Procedure
1. Display the oil pressure when the unit is not running, using the Gauge menu. The oil pressure should show
[LOW]. If not, the switch may be stuck open or the switch circuit may be open.
2. Check the 20B-01 wires in the Interface Harness with an ohmmeter for continuity, per Service Procedure
H04A
5-40
02 February 2005
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