DTC U0100-00: Lost Communication With ECM/PCM 'A': General Description

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The Controller Area Network (CAN) high speed BUS is used where data needs to be exchanged between modules at a high rate. The high rate 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 120 Ω 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).