Stratus Sedan V6-2.7L (2001)
Electronic Brake Control Module: Description and Operation
Fig.1 Integrated Control Unit (Typical)
CONTROLLER ANTILOCK BRAKE
The Controller Antilock Brake (CAB) is a microprocessor-based device which monitors the Antilock Brake System (ABS) during normal braking
and controls it when the vehicle is in an ABS stop. The CAB is mounted to the HCU as part of the Integrated Control Unit (ICU). The CAB uses a
24-way electrical connector on the vehicle wiring harness. The power source for the CAB is through the ignition switch in the RUN or ON
position. The CAB is on the PCI bus.
The primary functions of the controller antilock brake (CAB) are to:
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Monitor the antilock brake system for proper operation.
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Detect wheel locking or wheel slipping tendencies by monitoring the speed of all four wheels of the vehicle.
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Control fluid modulation to the wheel brakes while the system is in an ABS mode.
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Store diagnostic information.
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Provide communication to the DRB III scan tool while in diagnostic mode.
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Illuminate the amber ABS warning indicator lamp.
The CAB constantly monitors the antilock brake system for proper operation. If the CAB detects a fault, it will turn ON the amber ABS warning
indicator lamp and disable the antilock braking system. The normal base braking system will remain operational.
The CAB continuously monitors the speed of each wheel through the signals generated by the wheel speed sensors to determine if any wheel is
beginning to lock. When a wheel locking tendency is detected, the CAB commands the CAB command coils to actuate. The coils then open and
close the valves in the HCU that modulate brake fluid pressure in some or all of the hydraulic circuits. The CAB continues to control pressure in
individual hydraulic circuits until a locking tendency is no longer present.
The CAB contains a self-diagnostic program that monitors the antilock brake system for system faults. when a fault is detected, the amber ABS
warning indicator lamp is turned ON and the fault Diagnostic Trouble Code (DTC) is then stored in a diagnostic program memory. These DTC's
will remain in the CAB memory even after the ignition has been turned OFF. The DTC's can be read and cleared from the CAB memory by a
technician using the DRB III scan tool. If not cleared with a DRB III scan tool, the fault occurrence and DTC will be automatically cleared from
the CAB memory after the identical fault has not been seen during the next 3,500 miles.
Cab Inputs
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Wheel speed sensors (four)
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Brake lamp switch
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Ignition switch
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System and pump voltage
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Ground
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Diagnostic communication (PCI)
Cab Outputs
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Amber ABS warning indicator lamp actuation (via BUS)
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Instrument cluster (MIC) communication (PCI)
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Diagnostic communication (PCI, via BUS)
