Outline Of Diagnosis

The electric brake booster control module monitors the output value of the speed sensors. When the vehicle is being driven and a sudden irregular change in acceleration due to iron particles being attached to the speed sensor is detected repeatedly, or periodic sudden changes in acceleration due to iron particles being attached to the speed sensor rotor is detected, the electric brake booster control module judges that speed sensor noise is occurring and illuminates the MIL and stores a DTC. Also, when the vehicle is being driven and the output value of the speed sensor is momentarily interrupted repeatedly, the electric brake booster control module judges that there is a momentary interruption in the speed sensor circuit and illuminates the MIL and stores a DTC.