DTC U012A-00: Lost Communication With ICSC Module: General Description

The Controller Area network (CAN) high speed bus is used where data needs to be exchanged between modules at a high rate, to minimize the delay between the occurrence of a change in sensor value and the reception of this information by a control device using the information to adjust 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 2.0 (+/- 0.5) V.