Monitor "Oscilloscope" Measurement Using VMI With GDS.

Channel A: Measure the voltage differential between the CAN High and CAN Low ground leads, a square wave signal with the voltage limits V (min) = approx. 2.5V and V (max) = approx. 3.5V is detected.

Channel B: Measure the voltage differential between the CAN Low and CAN High ground leads, a square wave signal with the voltage limits V (min) = approx. 1.5V and V (max) = approx. 2.5V is detected.

These values are approximates values and can vary by a few hundred mV depending on the bus load.

* Precondition for the measurement: Battery connected and ignition "ON"

Fig 1: Scantool Display - Normal Signal Waveform Of C-CAN High And C-CAN Low

Courtesy of KIA MOTORS AMERICA, INC.