Passport EX 2WD V6-3.2L SOHC (6VD1) (1997)
Brake Pressure Differential Switch: Description and Operation
ABS Pressure Switch
Pressure Difference Between Front And Rear Brake Hydraulic Circuits
The brake pressure differential switch senses the pressure difference between the front and rear brake hydraulic circuits. If the pressure difference is
greater than a preset value, the switch closes and provides a ground for the "BRAKE" indicator lamp. The Electronic Brake Control Module (EBCM)
also receives this ground signal; it will disable the rear wheel anti-lock brake system (RWAL) system and light the "Rr ABS" indicator lamp, but no
diagnostic trouble code will be stored.