The ABS ECU supplies battery power to the electric motor by way of a motor relay which is controlled by the Electronic Control Unit(ECU). The electric motor pump supplies hydraulic pressure to all wheel brake calipers by operating the piston inside the pump.
The ABS ECU monitors the pump motor relay or fuse open, open or short in motor or motor lock and then sets this code if a malfunction is detected. Warning lamp is turned OFF unless fault is detected any more when the IG KEY is turned ON again, and wheel speed is more than 12 Km/h.
Item | Detecting Condition | Possible cause | |
Case1 | DTC Strategy | ● Run monitoring | ● Open or short of power supply circuit ● Faulty HECU |
Monitoring Period | ● Valve and pump motor test ● Inside the ABS control cycle | ||
Enable Conditions | ● The pump motor voltage must be present within a time of 100ms after actuation of the motor relay. | ||
Fail Safe | ● Pressure decrease (outlet valve) is no longer possible (wheels block). ABS is switched off immediately. ● The ABS warning lamp is activated and the EBD warning lamp is not activated. | ||
Case2 | DTC Strategy | ● Stop monitoring | |
Monitoring Period | ● Continuous if no ABS control. | ||
Enable Conditions | ● A high level of pump motor voltage with no actuation of the motor relay for more than 1.0sec. | ||
Fail Safe | ● The return pump runs continuously. ABS is switched off immediately. ● The ABS warning lamp is activated and the EBD warning lamp is not activated. |
