Electronic Brake Control Module: Description and Operation

ABS Main Control





The ABS/TCS control unit detects the wheel speed based on the wheel sensor signals it receives, then 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/TCS 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 three modes: pressure reducing, pressure retaining, and pressure intensifying.

TCS Main Control





The ABS/TCS control unit controls the TCS based on signal inputs from the accelerator pedal position sensor, engine speed, shifter position, and the wheel sensors. In addition, the ABS/TCS control unit sends an engine retard request signal to the PCM if necessary. The pressure intensifying control has three modes: pressure intensifying, pressure retaining, and pressure reducing.

Self-Diagnosis





^ The ABS/TCS control unit is equipped with a main CPU and a monitor IC. They check each other for problems.
^ The CPUs also check the circuit of the system.
^ When a problem is detected by self-diagnosis. The ABS/TCS control unit turns on the appropriate indicator(s).

On-board Diagnosis Function
The ABS and TCS 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 tester user's manuals for specific operating instructions.