Component Inspection

Component Inspection

1. Check the resistance of CAN BUS inside of module
(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 or ESP 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 2.5V or HIGH and LOW signal are fixed at 3.5V and 1.5V, respectively, it is due to communication error between modules.




(5) Does correct waveform generate from each module ?
YES
1) Go to "Verification of Vehicle Repair".
NO
1) Replace the module which generates poor communication waveform, and go to "Verification of Vehicle Repair".