RAM 1500 Van V8-5.9L VIN Z LDC (2001)
Controller Antilock Brake: Description and Operation
CONTROLLER ANTILOCK BRAKE
Fig. 8 RWAL Cab
The Controller Antilock Brakes (CAB) is a micro-processor which handles testing, monitoring and controlling the ABS brake system operation.
The CAB functions are:
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Perform self-test diagnostics.
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Monitor the RWAL brake system for proper operation.
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Control the RWAL valve solenoids.
NOTE: If the CAB needs to be replaced, the rear axle type and tire revolutions per mile must be programed into the new CAB.
Fig. 9 CAB/HCU
The CAB is mounted on the top of the hydraulic control unit. The CAB operates the ABS system and is separate from other vehicle electrical
circuits. CAB voltage source is through the ignition switch in the RUN position.
System Self-test
When the ignition switch is turned-ON the microprocessor RAM and ROM are tested. If an error occurs during the test, a DTC will be set into the
RAM memory. However it is possible the DTC will not be stored in memory if the error has occurred in the RAM module were the DTC's are
stored. Also it is possible a DTC may not be stored if the error has occurred in the ROM which signals the RAM to store the DTC.
