Element 4WD L4-2.4L (2004)
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 transmits the control signal to the modulator unit solenoid valve when the slip rate is
high.
The hydraulic control has three modes: pressure reducing, pressure retaining, and pressure intensifying.
Electronic Brake Distribution (EBD) Control
The Electronic Brake Distribution (EBD) function helps control vehicle braking by adjusting the rear brake force before the ABS operates. Based on
wheel sensor signals, the ABS control unit uses the modulator to control the rear brakes individually. When the rear wheel speed is less than the front
wheel speed, the ABS control unit retains the current rear brake fluid pressure by closing the inlet valve in the modulator. As the rear wheel speed
increases and approaches the front wheel speed, the control unit increases the rear brake fluid pressure by momentarily opening the inlet valve. This
whole process is repeated very rapidly. While this is happening, there may be kickback at the brake pedal.
During self-diagnosis, if the ABS control unit detects a problem that affects the EBD, it turns on the brake system indicator and the ABS indicator.
Self-diagnosis Function
1. The ABS control unit is equipped with a CPU and a monitor IC. They check each other for problems.
2. The CPU checks the system circuits.
3. The ABS control unit turns on the ABS and possibly the brake system indicator when the unit detects a problem, and the unit stops ABS operation.
4. The self-diagnosis can be classified into these two categories:
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Initial diagnosis
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Regular diagnosis
On-board Diagnosis Function
The ABS can be diagnosed with the Honda PGM Tester or HDS.
The ALB Checker cannot be used with this system. For air bleeding, and checking wheel sensor signals, use the Honda PGM Tester or HDS. See the
Honda PGM Tester user's manual or HDS help menu for specific operating instructions.
