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SPN 101 - FMI 15 (Fault Code 1974)

SPN101 FMI15
Crankcase Pressure - Data Valid but Above Normal Operational Range - Least Severe Level

ISB, ISC, and ISL with CM2150 - Crankcase Pressure Sensor

CODES:
Fault Code: 1974
PID(P), SID(S): P101
SPN: 101
FMI: 0/15
Lamp: Maintenance

REASON: Crankcase Pressure - Data Valid but Above Normal Operational Range - Least Severe Level. The crankcase breather filter requires maintenance.

EFFECT: None on performance.

Circuit Description:
The crankcase pressure sensor is used to monitor the pressure inside the crankcase. The electronic control module (ECM) supplies the crankcase pressure sensor a 5 volt reference voltage. When the crankcase pressure is low, the sensor signal voltage is low. When the crankcase pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The ECM monitors the crankcase pressure signal circuit voltage to calculate the pressure of the air within the crankcase.

Component Location:
The crankcase pressure sensor is located in the crankcase filter assembly. The crankcase filter is located on the left side of the engine.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine speed is greater than 500 rpm.

Conditions for Setting the Fault Codes:
The ECM detects that the crankcase pressure is greater than a calibratible limit.

Action Taken When the Fault Code is Active:
• The ECM flashes the amber CHECK ENGINE light for 30 seconds at initial key-on when the crankcase pressure has been detected to be above 20 cm H2O [8 in H2O].

Conditions for Clearing the Fault Code:
The ECM will turn off the flashing amber CHECK ENGINE light as soon as the crankcase pressure drops below 20 cm H2O [8 in H2O].

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.

Possible causes of this fault code include:
• Crankcase breather filter needs to be replaced.


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