Cummins ISX11.9 CM2250 – Service Manual Lubricating Oil Pressure Low

Electronic fault codes active or high counts of inactive fault codes

Refer to Section TF in the Fault Code Troubleshooting Manual, Bulletin
4022225, for fault code troubleshooting.

Lubricating oil pressure sensor or circuit is malfunctioning (electronic controlled fuel system)

Check the lubricating oil pressure sensor and circuit. Refer to
Procedure 019-066 in Section 19
.

Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 007-013,
Procedure 007-037, and
Procedure 007-083 in Section 7. Refer to Cummins® Engine Oil and Oil Analysis Recommendations, Bulletin 3810340 and Procedure 018-003 in Section V in the Operation and Maintenance Manual, ISX11.9 CM2250, Bulletin 2883444. Use the oil type recommended in Section V of the operation and maintenance manual.

Lubricating oil is contaminated with coolant or fuel

Refer to the Lubricating Oil Contaminated symptom tree.

Lubricating oil level is above or below specification

Check the oil level. Add or drain oil, if necessary. Refer to
Procedure 007-037 in Section 7 .

Engine angularity during operation exceeds specification

Refer to the Engine Specification data sheet.

Lubricating oil filter is plugged

Change the oil and filter. Refer to Procedure 007-013 and
Procedure 007-037 in Section 7. Review the oil change interval. Refer to
Procedure 102-002 in Section 2 in Operation and Maintenance Manual, ISX11.9 CM2250, Bulletin 2883444.

Lubricating oil pump is malfunctioning or the o-rings are damaged

Inspect the lubricating oil pump and o-rings. Refer to
Procedure 007-031 in Section 7
.

Lubricating oil high-pressure relief valve or lubricating oil pump is malfunctioning

Remove and inspect the high-pressure relief valve or lubricating oil pump. Refer to Procedure 007-021 and
Procedure 007-031 in Section 7.

Lubricating oil temperature is above specification

Refer to the Lubricating Oil Temperature Above Specification symptom tree.

Lubricating oil suction or transfer tube is loose or broken, or the gasket or o-rings are leaking

Remove and inspect the oil pan or suction tube. Refer to
Procedure 007-025 in Section 7
.

Piston cooling nozzles are damaged or are not installed correctly

Check the piston cooling nozzles for damage and correct installation. Refer to
Procedure 001-046 in Section 1
.

Accessory oil flow exceeds engine specification

Refer to the Engine Specification data sheet.

Lubricating oil cooler is plugged

Check the oil cooler. Refer to
Procedure 007-003 in Section 7
.

Internal engine damage

Analyze the oil and inspect the filters to locate an area of probable damage. Contact a Cummins® Authorized Repair Location.