DTC B2801-00: MM CAN Signal Line Error (M-CAN Single Line Error): General Description

The Controller Area Network (CAN) bus is used where data needs to be exchanged between modules. The CAN bus is used to minimize the delay between the occurrence of a change in a sensor value, and the reception of this information by the control device using the information to adjust the vehicle system performance. The CAN network consists of two twisted wires; one signal circuit is identified as CAN high and the other signal circuit is identified as CAN low. At each end of the data bus there is a 120Ω termination resistor between the CAN high and CAN low circuits. When the CAN high signal circuit is driven higher, to about 3.5V, and the CAN low circuit is driven lower, to about 1.5V, the differential voltage becomes approximately 2.0V (+/- 0.5).