GMC Terrain, Equinox, and SRX Forum banner
1 - 1 of 1 Posts

Super Moderator
'16 Equinox LTZ AWD 3.6
1,727 Posts
Biggest issues with complete data is determining the normal operating ranges of that data.
That's where a shop manual comes into play as it will list some normal ranges.
An example is STFT. Normal range is -3 to +3 short term fuel trims. The closest to zero the better when diagnosing front O2 sensor operation and fueling control checked at idle.
  • Like
Reactions: Urbansuburban
1 - 1 of 1 Posts