Controller Antilock Brake - Chrysler PT Cruiser Service & Repair Manual

8E - 2 ELECTRONIC CONTROL MODULES
CONTROLLER ANTILOCK BRAKE (Continued)
Fig. 1 Integrated Control Unit (ICU)
1 - PUMP/MOTOR
2 - HCU
3 - PUMP/MOTOR WIRING CONNECTOR
4 - CAB
Fig. 2 CAB Location In Vehicle
1 - TRANSAXLE
2 - HCU
3 - LEFT HALFSHAFT
4 - CAB
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 actu-
ate. The CAB command coils then open and close the
valves in the HCU that modulate brake fluid pres-
sure 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
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 mem-
ory even after the ignition has been turned off. The
DTC's can be read and cleared from the CAB mem-
ory by a technician using the DRB scan tool. If not
cleared with a DRB 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 of vehicle operation.
CONTROLLER ANTILOCK BRAKE INPUTS
• wheel speed sensors (four)
• brake lamp switch
• ignition switch
• system relay voltage
• ground
• traction control lamp actuation (if equipped)
• diagnostic communication (PCI)
CONTROLLER ANTILOCK BRAKE OUTPUTS
• amber ABS warning indicator lamp actuation
(through MIC)
• red BRAKE warning indicator lamp actuation
(through MIC)
• traction control lamp (if equipped)
• diagnostic communication. (PCI)
REMOVAL
(1) Disconnect battery negative cable.
(2) Raise vehicle. (Refer to LUBRICATION &
MAINTENANCE/HOISTING - STANDARD PROCE-
DURE)
(3) Disconnect pump/motor connector from CAB
(Fig. 3).
Fig. 3 CAB Mounting
1 - PUMP/MOTOR CONNECTOR
2 - CAB MOUNTING SCREWS
PT