Long term fuel trim, part load
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Measurement range -50-+50%
The value indicates how much the injection period at part load has been adjusted compared to a reference value.
The value is first updated after the engine has been revved