Electronic Brake Control Module: Description and Operation

ABS Function





The control unit computes the wheel rotating speed by the signa current sent from the sensor. Then it supplies a DC current to the actuator solenoid valve. It also controls ON-OFF operation of the valve relay and motor relay. If any electrical malfunction should be detected in the system, the warning lamp is turned on. In this condition, the ABS will be deactivated, and the vehicle's brake system reverts to normal operation.

TCS Function





Drive wheel slippage is detected by the 4-wheel rotating speed signal. When the wheel slip becomes excessive, the Traction Control System (TCS) operates, causing the SLIP indicator lamp to flash. And, at the same time, a fuel-cut signal to be sent to the ECM and a signal requiring a change in the shift schedule is sent to the TCM. When the TCS OFF switch is used to cancel TCS function, the TCS OFF indicator lamp will light. (TCS does not activate.) In case of a malfunction in the TCS, both the SLIP indicator lamp and the TCS OFF indicator lamp will light, while shutting down the TCS system operation. The vehicle will operate in the same way as a vehicle not equipped with the TCS.





P1211 [1][2]ABS/TCS Control Unit
The malfunction information related to ABS/TCS control unit is transferred through the line (LAN) from ABS/TCS control unit to ECM.
Be sure to erase the malfunction information such as DTC not only for [1][2]ABS/TCS control unit but also for ECM after the ABS/TCS related repair.

P1212 ABS/TCS Communication Line
This circuit line is used to control the smooth engine operation of ABS/TCS during the TCS operation. Pulse signals are exchanged between ECM and [1][2]ABS/TCS control unit.
Be sure to erase the malfunction information such as DTC not only in [1][2]ABS/TCS control unit but also ECM after the ABS/TCS related repair.