VAG owners can use a device and program called VCDS (formally Vagcom) to see and log the ECU engine data.
If a diesel engine has lambda sensors it is able to make accurate assessments about fuelling.
Bosch Injector PD tdi engines do not have lambda sensors and so are unable to calculate the efficiency of their own fueling. This means that VCDS figures about fuelling are ECU request figures not actual outcome figures.
VCDS 17.8.1 Full+Loader V2/V4 Free Download
So a car with a worn camshaft or worn injectors could have messed up fuelling and the ECU will never know. This is why real chip tuning/remapping should be done on a rolling road with sensors measuring the Air/Fuel ratio.
Map changes without a rolling road and Air/fuel ratio measurements have to assume that the engine is in perfect, unworn condition .
The information below is mostly based on a VW 100 bhp pd tdi engine and EDC15 ecu.
Looking at maps.
The Basics.
For the engine to run it will need a Quantity of fuel (IQ) injected at at
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