PACCAR MX (2004 Emissions) Fault Code: P0069 Inlet Air Pressure in Inlet Manifold – Data erratic, Intermittent or Incorrect, at Ignition On

PACCAR MX (2004 Emissions) Fault Code: P0069 Inlet Air Pressure in Inlet Manifold – Data erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the measured boost pressure differs more than 0.17 bar [2.5 PSI] from the average of other engine pressure sensor readings for more than five seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the ignition is keyed on (NO engine start) and
2. Ambient temperature is more than -20°C [-4°F]

CORRESPONDING OBD READINESS MONITOR:
None

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

REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
3. Did the DTC come back? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
Boost pressure sensor deviation

ADDITIONAL INFORMATION:
For this diagnostic, the boost pressure sensor (F802) reading is compared with an average of other engine pressure sensor readings.