CI Ajax调用问题

I have controller named "test.php". I have also written the ajax calling functions in this page as well. Like for checking data, uploading the image etc. Problem is when ever i call any of the ajax function , and do logout after it (successful or UN-sucessfull result of ajax), And then login again, then it transfer me to same ajax function which i called before logging out, instead of index function. Below are steps that i follow.

1. Call ajax function "test/ajax_1_chk" to check user data.
2. Logout the user.
3. login Again with any user.
4. it will redirect to "test/ajax_1_chk" , but instead ti should go to "test/index". this happens only first time.

I applied path in it. But does not work all the time.

Can any one guide me in this.

Thanks in Advance