Wrangler 4WD L4-150 2.5L VIN P MFI (1998)
Brake Fluid Pump Relay: Description and Operation
DESCRIPTION
The ABS system has two relays, which are the main and pump motor relays. The main relay is used for the solenoid valves and Controller
Antilock Brake (CAB). The main relay is connected to the CAB at the power control relay terminal. The pump motor relay is used for the pump
motor only. The pump motor relay starts/stops the pump motor when signaled by the CAB.
CIRCUIT OPERATION
The ABS pump motor relay in the power distribution center (PDC) supplies voltage to the ABS pump motor. When the ABS main relay energizes,
circuit B47 supplies battery voltage to the coil side of the ABS pump motor relay The Controller, Anti-Lock Brakes (CAB) provides ground for
the pump motor relay coil on circuit B116.
When the ABS pump motor energizes, it connects circuit A10 from PDC fuse 14 to circuit B120. Circuit B120 supplies battery voltage to the
pump motor and also connects to the CAB. Circuit Z1 provides ground for the pump motor.
