Component Inspection

Engine

Engine Control - U0001 High Speed CAN Communication Bus off Component Inspection

Component Inspection

Check CAN communication waveform generation
1. IG "OFF" and connect each channel scope to CAN-HIGH terminal and CAN-LOW terminal.
2. IG "ON" after disconnecting only ECM to CAN BUS.
3. IG "ON" after disconnecting only ABS/ESC ECU to CAN BUS.
4. IG "ON" after disconnecting only Instrument Cluster to CAN BUS.

Specification : At Ignition "ON", the waveform is same as the one of "Signal Waveform & Data".





** Different from "Signal Waveform & Data", if 1) both CAN HIGH and LOW signal are fixed at 2.5 V or 2) HIGH and LOW signal are fixed at 3.5 V and 1.5 V, respectively, it is due to communication error between modules.




5. Is the measured waveform normal?