CL TYPE S V6-3.2L SOHC (2001)
Electronic Brake Control Module: Description and Operation
ABS Control Unit
Main Control
The ABS control unit detects the wheel speed based on the wheel sensor signal it received, then it calculates the vehicle speed based on the detected
wheel speed. The control unit detects the vehicle speed during deceleration based on the rate of deceleration.
The ABS control unit calculates the slip rate of each wheel, and it transmits the control signal to the modulator unit solenoid valve when the slip rate is
high.
The pressure reduction control has 3-modes: pressure reduction, pressure retaining, and pressure intensifying.
Self-diagnosis
1. The ABS control unit is equipped with a main CPU and a sub CPU. Each CPU checks the other for problems.
2. The CPUs check the circuit of the system.
3. Self-diagnosis can be class field into 2 categories:
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Initial diagnosis: Performed right after the engine starts and until the ABS indicator goes off.
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Regular diagnosis: Performed right after the initial diagnosis until the ignition switch is turned OFF.
4. When a problem is detected by self-diagnosis, the system:
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Turns the fail-safe relay OFF
^
Turns the solenoid valve OFF
^
Turn the pump motor OFF
^
Turns the ABS indicator ON
Self-diagnosis Table
