CAN communication Line Inspection
- Check CAN communication
- Connect all of control module connector.
- IG KEY ON.
- Make CAN communication is wake up status (Ex.. ON/OFF Door SW)
- Measure signal waveform of B-CAN-HIGH terminal of Diagnostic connector and chassis ground.
- Measure signal waveform of B-CAN-LOW terminal of Diagnostic connector and chassis ground.
Specification: Refer to SIGNAL WAVEFORM & DATA
- Is the measured signal waveform normal?
YES
- Check for poor connection between harness connector and Smart Key Module or ECM.
Thoroughly check connector for looseness, poor connection, bending, corrosion, contamination, deformation, or damage. Repair or replace as necessary, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Disconnect SMK ECU, IPM, DDM, FAM, Tilt ECU, PDM, ADM, RAM and IMS one by one, and then check that DTC is erased with scantool.
- Substitute with a known-good module and check for proper operation. If the problem is corrected, replace module, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- If the measured value is battery voltage, check for short to battery in CAN line. Repair or replace as necessary, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure. In case that Communication is in sleep mode, 12V will be measured. Therefore, check that communication is in Wake up status.
- If 0V is detected, check for short to ground, and check for short between CAN high and low or open in CAN high or CAN low harness. Repair or replace as necessary, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Check for poor connection between harness connector and Smart Key Module or ECM.