Position Feedback Switches (PFS)

Fig. 5 PFS System Voltages:

Fig. 6 Control Module Connector Identification:

There are eight position feedback switches, two located in each shock and strut. One PFS is designated Soft and one Firm. The switches monitor the orifices in the shocks and struts and tell the VDCM which damping position the shocks and struts are presently in.

PFS INPUT CHANGES

There are four possible positions that the PFS could be in. Soft, Norm and Firm are positions that can be selected. The PFS will be in the Illegal position if there is a system malfunction. If the motors in the shocks/struts drift, causing the PFS input to change and there has been no over current fault (short to ground or internal motor short) since the last Reset, the module will drive the motor(s) in question until the PFS input is correct. The PFS input is correct when the PFS tell the module that the shocks and struts are in the selected damping position. If two seconds pass and PFS input is still incorrect, the module will enter the Fault mode.
Refer to voltages of the PFS circuits when the shocks/struts are in the various positions. The pin numbers refer to the pins at the VDCM 25-Way connector.