Line pressure solenoid STH control
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Line pressure solenoid STH controls the reference pressure for the transmission. The reference pressure in turn controls the system pressure in the transmission so that the system pressure in gear D varies between 0.28 - 1.2 MPa (R position: 0.5 - 1.8 MPa). Solenoid control is directly dependent on the signal from the throttle position (TP) sensor. The higher the signal from the throttle position (TP) sensor the greater the reference pressure and therefore line pressure.
Measurement range: 0 - 100 %
0 % control, minimal reference pressure, gives lowest line pressure.
100 % control, maximum reference pressure, gives highest line pressure.