Component Inspection

Engine Control
U0001 CAN Communication BUS Off - Inspection/Repair:_:Component Inspection

Component Inspection

1. Check CAN communication waveform generation
(1) Ignition "OFF"
(2) Connect 2 channel scope to DLC terminal 3(CAN HIGH) and 11(CAN LOW).
(3) Ignition "ON" after connecting only PCM to CAN BUS.
(4) Ignition "ON" after connecting only ABS/ ESC module to CAN BUS.
A. Specification :
At Ignition "ON", the waveform same as "Signal Waveform & Data" of above signal waveform.
** 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) Does correct waveform generate from each module?
YES
> Go to "Verification of Vehicle Repair".
NO
> Replace the module which generates poor communication waveform, and go to "Verification of Vehicle Repair".