FUEL-TRIM OBSERVATION WORKSHEET
Original STEP worksheet. Example values in the article are fictional, not specifications.
Case / vehicle / engine / fuel type:
Current service information / revision / applicable limits:
Tool / software / scan mode / exact PID labels and units:
Prior repair / code clear / adaptation reset / unknown history:
Capture reference / timestamp / symptom present or absent:
Operating condition / RPM / load / temperature / fuel-system status:
Bank / STFT observed range / LTFT observed value:
Other bank under the same conditions, if supported:
Known transient or change during capture:
Observed fact:
Hypothesis, kept separate from fact:
Next vehicle-specific test / why / required conditions:
Result / evidence reference / remaining uncertainty:
Repeat comparable capture after work; follow applicable adaptation instructions.