Cummins ISB4.5 CM2150 Fault Code: 253 PID: SPN: 98 FMI: 1 Engine Oil Level – Data Valid but Below Normal Operating Range – Most Severe Level.

Circuit Description
An algorithm in the electronic control module (ECM) calibration monitors engine oil level while the ECM is keyed on and no engine speed is detected. If the engine oil level falls below a certain threshold, the ECM will activate Fault Code 253.

Component Location
The engine oil level sensor is located on the engine oil dipstick, on the air intake side of the engine.

Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is in the ON position and the engine speed is 0 rpm.

Conditions for Setting the Fault Codes
The engine oil level is detected to be very low at key-on.

Action Taken When the Fault Code is Active
-The ECM illuminates the red STOP ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the red STOP ENGINE light and the fault code will go inactive immediately after the diagnostic runs and passes.
-This fault code can also be cleared with INSITE™ electronic service tool.

Shop Talk
If inactive counts of Fault Code 253 are logged in the ECM, it can be possible that the engine was running or keyed on while tilted at an angle severe enough to cause this fault to be triggered.

Other causes of Fault Code 253 can include:

-The engine might not have been filled to proper capacity during the most recent oil change
-External engine oil leaks (oil leaking onto the ground)
-Internal engine oil leaks (oil leaking into the fuel system or cooling system)
-High engine oil consumption/power cylinder failure (check for abnormally high blowby when the engine is loaded).