Mazda CX-5 Service & Repair Manual: ABS Control
Outline
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ABS control occurs when wheel slip is determined by the DSC CM (based on the four ABS wheel-speed sensors). Then, the DSC HU inlet and outlet solenoid valves are operated and brake fluid pressure is controlled accordingly to prevent wheel lock-up.
Feature
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Use of ABS control during emergency braking or on slippery road surfaces allows directional stability to be maintained, steerability ensured, and stopping distance to be reduced.
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The ABS control system has independent front wheel control and unified control (select low) for the rear wheels.
NOTE:
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Select low control: A control system in which the left and right vehicle wheel speeds are compared and brake fluid pressure is controlled according to the wheel most likely to lock-up.
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Construction
Block Diagram
Operation
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When the DSC CM determines wheel slip conditions based on the signals from the ABS wheel-speed sensors during braking, the DSC CM operates the DSC HU inlet and outlet solenoid valves, reducing and maintaining brake fluid pressure in accordance with the wheel slip factors. Then, when the wheel slip condition has passed, brake fluid pressure is increased and maintained, ensuring braking with a constantly stable brake force.
Control condition transition diagram
ABS
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ABS Wheel Speed Sensor And ABS Sensor Rotor
Purpose/Function
The ABS wheel-speed sensor and ABS sensor rotor detect the rotation condition
of each wheel and transmit this information to the DSC HU/CM.
The signal from the ABS w ...
Other materials:
Initial Learning [Fw6 A EL, Fw6 Ax EL]
Introduction
If the control valve body and oil pressure switch are replaced, always perform
the initial learning. If the initial learning is not completed, engine rev-up
may occur or shift shock may increase. DTC P06B8:00 is displayed while the initial
learning has not been implement ...
Low Clutch [Fw6 A EL, Fw6 Ax EL]
Purpose/Function
The low clutch operates in 1GR, 2GR, 3GR and 4GR and intermittently operates
the sun gear by drive force from the turbine shaft.
For the low clutch, a centrifugal balance clutch has been adopted to prevent
clutch drag and to assure stabilized piston thrust in al ...
Front Body Control Module (Fbcm)
Outline
Located at the front of the vehicle, the front body control module (FBCM)
performs numerous system controls for functions at the front of the vehicle.
Function
The front body control module (FBCM) controls the system based on the input/output
signals.
The fu ...
