Case Type: Technical Diagnostic Case Analysis
Application: Electronic Diesel Engine Management
Diagnostic Focus: Cylinder Correction / Contribution Analysis
A cylinder showing a large ECU fuel correction can quickly become the suspected injector.
That is only one possible explanation.
The ECU is compensating for a cylinder contribution difference.
It does not directly identify why the difference exists.
Before condemning the injector, diagnosis may include:
If the cylinder has a mechanical compression problem, replacing the injector will not normalize combustion contribution.
For the broader interpretation method, see Technical Insight: Why Diesel Cylinder Correction Values Should Not Be Used as a Standalone Injector Test.
Cylinder correction should be treated as directional diagnostic data, not as a standalone injector verdict.
