Well, one day I went to a immigration barrister in Toronto and explained the situation that I have PR Card.
I pay income tax and deposit enough amount to joint account for my wife usage. But my wife threat me for divorce and removal from country.
So your wife sponsored you, but now she
wants to get divorced?
Many times when the marriage breaks down, the sponsor will threaten to report the newly arrived spouse for marriage fraud. But since it is your wife who wants to break up, it does not really sound like marriage fraud. Now if you arrived, got your PR card, then immediately left your wife and demanded a divorce, then yes, it would look like marriage fraud.
Immigration barrister said if she give you divorce then " you will be investigated but if they(Canadian immigration) believe you, then you will not be deported."
Many people do report their spouse for marriage fraud, but in almost all cases the Canadian government does nothing, or investigates a bit but then says it is impossible to prove. Marriage fraud is difficult to prove. Even in cases where it seems obvious to others that marriage fraud took place, the gov't still does nothing. So most likely nothing will happen to you, you will not lose your PR, and you can eventually sponsor someone else and become a citizen if you like. This is as long as you did not lie on the application - if you did lie, and it was something serious, then if your wife knows about the lie and reports it, you could lose your PR. This would be for something like having a child back home that you did not declare, or having a criminal background you did not declare.
My question is that why I will be investigated ?
Your wife is probably claiming your marriage was fake. However, it is difficult to prove. If she has no evidence, CIC will do nothing. Even with evidence, CIC usually does nothing.
When I will be investigated?
Will I be investigated on application for separation/ application for divorce / application for citizenship?
If they did an investigation, it would be soon, or as soon as the backlog of cases allowed.
Unless you lied on the application for the PR visa, I doubt you have anything to worry about.