PACCAR MX (2004 Emissions) Fault Code: P1403 Crankcase Air Pressure – Data Erratic, Intermittent or Incorrect, at Ignition On

PACCAR MX (2004 Emissions) Fault Code: P1403 Crankcase Air Pressure – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the measured crankcase pressure differs by greater than 5 mbar [0.07 PSI] from the expected pressure.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on (engine not running).

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.

POSSIBLE CAUSES:
1. Engine stalled twice consecutively
2. Crankcase pressure sensor deviation

ADDITIONAL INFORMATION:
The crankcase pressure is monitored with the crankcase pressure sensor (F806) against ambient pressure.