Cherokee 2WD L4-150 2.5L VIN H TBI (1988)
Brake Fluid Pressure Sensor/Switch: Description and Operation
Boost Pressure Differential Switch
Fig. 11 Boost Pressure Differential Switch/Fluid Level Switch
Fig. 12 Boost Pressure Differential Switch Circuitry
BOOST PRESSURE DIFFERENTIAL SWITCH
Boost pressure differential switch detects a pressure differential between the modulated boost pressure and master cylinder primary system
pressure and is mounted in the pressure modulator (fig. 11). This switch is a single pole, single throw switch which is normally open when the
pressure differential is normal and is grounded through the vehicle body if a pressure differential problem is detected. Once grounded, the
Electronic Control Unit (ECU) will cause both indicator lights to illuminate on the instrument panel (fig. 12).
