longTermFuelTrim1

Represents the longer term average of the air/fuel mixture that the vehicle used during engine operation

High-Level Explanation

Similar to shortTermFuelTrim1, but averaged over a longer period of time.

Negative values of this signal represent that the vehicle's computer determined a lean fuel mixture is necessary (i.e. decreasing the amount of fuel in the fuel/air mixture that is used for engine operation)

Positive values of this signal represent that the vehicle's computer determined a rich fuel mixture is necessary (i.e. increase the amount of fuel in the fuel/air mixture that is used for engine operation)

This value should generally be between -10% and +10% for appropriately working engines.

Enables

Enabled By

Known Quirks

Visualizations with Explanations

longTermFuelTrim1 for an example vehicle that tends to have a very lean fuel mixture

longTermFuelTrim1 for an example vehicle that tends to have a somewhat lean fuel mixture, but generally does not exceed -10%