SPN 98 - FMI 1 (Faut Code 253)

SPN 98 - FMI 1 (Faut Code 253)

ISB, ISC and ISL with CM2150 - Engine Oil Level Sensor Circuit

Fault Code: 253
PID(P), SID(S): P98
SPN: 98
FMI: 1
Lamp: RED

REASON: Engine Oil Level - Data Valid But Below Normal Operational Range - Most Severe Level. Very low oil level has been detected by the oil level sensor.

EFFECT: The engine may derate. Possible low oil pressure, possible severe engine damage.

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:
The ECM will turn off the red STOP ENGINE lamp and the fault code state will become inactive immediately after the diagnostic runs and passes. The fault code can also be cleared using INSITE™ electronic service tool.

Shop Talk:

  • Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
  • If inactive counts of Fault 253 are logged in the ECM, it could 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 may include:
• The engine may 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).

Read More:
SPN 98 - FMI 2 (Fault Code 252)
SPN 171 - FMI 4 (Fault Code 256)


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