Multiplex Communication System - How To Proceed With Troubleshooting

Lexus IS250 IS220d GSE20 ALE20 - MULTIPLEX COMMUNICATION


MULTIPLEX COMMUNICATION SYSTEM - HOW TO PROCEED WITH TROUBLESHOOTING

  • HINT:
Use this procedure to troubleshoot the multiplex communication system.
The intelligent tester should be used in step 2.

1.VEHICLE BROUGHT TO WORKSHOP
NEXT
2.CHECK FOR DTC

Check for DTCs and note any codes that are output.

Delete the DTC.

Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.

  • Result:
  • ResultProceed to
    DTC does not reoccurA
    DTC reoccursB
B.
GO TO DTC CHART
A
3.OVERALL ANALYSIS AND TROUBLESHOOTING

Terminals of ECU .

NEXT
4.ADJUST, REPAIR OR REPLACE
NEXT
5.CONFIRMATION TEST
NEXT
END