Case Type: Technical Diagnostic Case Analysis
Application: DPF-Equipped Diesel Engine
Diagnostic Focus: Active Regeneration / Injection Strategy
An increase in fuel consumption or exhaust temperature can create concern about injector over-fueling.
If the condition occurs during active DPF regeneration, the ECU operating strategy must be considered first.
Useful information includes:
The key distinction is:
fueling changes only during commanded regeneration
versus
abnormal fueling remains during normal operation.
If the ECU is intentionally changing injection strategy, replacing injectors does not remove the commanded behavior.
For the broader explanation, see Technical Guide: How DPF Regeneration Strategy Can Affect Diesel Fuel-Injection Diagnosis.
Injector diagnosis should account for active aftertreatment operating modes before normal control behavior is classified as a fault.
