IG KEY "OFF", ENGINE "OFF"
Disconnect ECM, and ABS(ESP) connector
Connect 2 channel scope to DLC terminal 3(CAN HIGH) and 11(CAN LOW).
IG KEY "ON" after connecting only "the Control Module(s) to be checked" to CAN BUS.
Specification : At IG KEY "ON".
※ 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.
Is there a module which outputs normal waveform after disconnecting module connectors or which outputs abnormal waveform after connecting module connectors?
YES
Replace the module which generates poor communication waveform, and go to "Verification of Vehicle Repair".
NO
Go to "Verification of Vehicle Repair".
