@mods plz close this thread
PROBLEM SOLVED !
Actually my car is UK import with immobilizer and it was running with JDM 2nzfe non-imobilizer ECU. So after a little alteration with one of the ECU connectors, everything is working like a charm now. I am also posting a pic of altered ECU pinouts for better understanding. It took me almost 4 months to root out the cause, but Alhamdolillah I am done now.Alteration has been done with the highlighted connector.