Overview

Code

Fault Code: 1974

PID: P101

SPN: 101

FMI: 0/15

LAMP: Maintenance

SRT:     

Reason

The crankcase breather filter requires maintenance.

Effect

None on performance.

Crankcase Pressure Sensor Circuit

Circuit Description

The crankcase pressure sensor is used to monitor the pressure inside the crankcase. The engine 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 near the crankcase ventilation element.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes

The engine control module (ECM) detected the crankcase pressure in the breather tube was greater than a calibrated value.

Action Taken When the Fault Code is Active

• The ECM logs the fault code immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code

• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• Use the recommended Cummins electronic service tool or equivalent “Data Monitor/Logger” feature to monitor Crankcase Pressure with the engine running at idle. If the crankcase pressure reading is below 7.0 in H20, the repair has been validated.
• The “Reset All Faults” command in the recommended Cummins electronic service tool or equivalent can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The fault code status displayed by the recommended Cummins electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.

Shop Talk

If this fault code is active, the crankcase breather system may need to be inspected.

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