Which regeneration procedure is not allowed when the DPF lamp is not illuminated?

Which regeneration procedure is not allowed when the DPF lamp is not illuminated?

• A. Active Regeneration
• B. Passive Regeneration
• C. Parked Regeneration
• D. Forced Regeneration

Answer: (C)

When the DPF lamp is not illuminated, the system is not signaling a soot-load issue that needs regeneration. Parked regeneration is a manual, stationary process that operators use to burn off soot when the vehicle is told regeneration is needed (usually indicated by the lamp). If the lamp isn’t on, initiating a parked regeneration isn’t permitted because the system hasn’t entered a regeneration-needed state, and forcing a parked cycle could lead to unsafe or unnecessary heat buildup. Active regeneration, driven by the engine management while you’re driving, increases exhaust temperature to burn off soot and can occur even when the lamp isn’t lit if driving conditions meet the requirements. Passive regeneration happens automatically during normal driving when exhaust temperatures are high enough, without any operator action. Forced regeneration is a technician-initiated service action to drive the cycle through a diagnostic tool, typically used when automatic regenerations aren’t completing.

When the DPF lamp is not illuminated, the system is not signaling a soot-load issue that needs regeneration. Parked regeneration is a manual, stationary process that operators use to burn off soot when the vehicle is told regeneration is needed (usually indicated by the lamp). If the lamp isn’t on, initiating a parked regeneration isn’t permitted because the system hasn’t entered a regeneration-needed state, and forcing a parked cycle could lead to unsafe or unnecessary heat buildup.

Active regeneration, driven by the engine management while you’re driving, increases exhaust temperature to burn off soot and can occur even when the lamp isn’t lit if driving conditions meet the requirements. Passive regeneration happens automatically during normal driving when exhaust temperatures are high enough, without any operator action. Forced regeneration is a technician-initiated service action to drive the cycle through a diagnostic tool, typically used when automatic regenerations aren’t completing.