PACCAR PX-8 CM2150 (2007-09) Fault Code: 1942 PID: 101 SPN: 101 FMI: 2 Crankcase Pressure – Data Erratic, Intermittent, or Incorrect. The ECM has detected that the crankcase pressure signal is not changing with engine operating conditions.

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, calibrate the ECM.

This fault code can be caused by a crankcase breather hose disconnected between the engine outlet and the crankcase filter assembly on engines with an externally mounted crankcase filter option.

This check is only performed at keyswitch OFF, during the ECM powerdown. During this diagnostic check, the ECM monitors the value of the crankcase pressure sensor. If this value is outside of a specified range, Fault Code 1942 is set active at the next key ON.

Possible causes:

1)Resistance in the wiring harness
2)A malfunctioning in-range pressure sensor.

This fault code can be triggered if the crankcase pressure sensor is not installed correctly in the housing.

Possible repairs:

1)Install the oil fill cap properly.
2)Clean or replace the crankcase breather outlet hose.
3)Clean or replace and properly connect the crankcase breather hose.
4)Replace the crankcase pressure sensor.
5)Replace the crankcase breather filter element.
6)If necessary, calibrate the ECM.