PACCAR MX (2004 Emissions) Fault Code: P1722 BPV Control – Data Erratic, Intermittent, or Incorrect

PACCAR MX (2004 Emissions) Fault Code: P1722 BPV Control – Data Erratic, Intermittent, or Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the actual BPV valve position measured by the BPV valve actuator differs too much from the commanded position (by the PCI ECU) for more than 40 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is running.

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:
Sticking or blocked BPV valve or mechanism

ADDITIONAL INFORMATION:
The BPV valve is supposed to create back pressure in the engine exhaust system and control exhaust gas mass flow. During normal engine control, the BPV valve position is commanded by the PCI ECU. The actual control of the valve is carried out by the actuator on the BPV valve (L096), a smart actuator that communicates with the PCI ECU via ECAN. The actuator provides feedback to the PCI ECU about the valve position.