Section 5 – SR-2 Diagnostics
19 LOW ENGINE OIL PRESSURE
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Diagnostic Procedure
1. Check engine oil level.
2. Verify engine oil pressure, using an independent oil pressure gauge connected at the oil pressure switch
block.
3. Check if the oil pressure switch is open with good oil pressure and closed with low oil pressure.
4. Check for Alarm Code 31 as a related alarm.
5. Display the oil pressure when the unit is running, using the Gauge menu. The oil pressure should be [OK].
If not, the switch may be stuck closed or the switch circuit may be shorted.
6. The oil pressure switch should be closed when the engine is not running and open when the engine is
running. Confirm using an ohmmeter.
7. Check the voltage of the 20B-01 wire at the 36 pin interface board connector J7 pin 28. Battery volts
should be present when the engine is running.
8. Connect an oil pressure gauge and confirm that oil pressure is present when the unit is running.
9. Check the 20B-01 wires in the Main Harness with an ohmmeter for shorts per Service Procedure H04A
5-29
02 February 2005
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