Hi Mohammed,
There is no route needed if the IP address is in same subnet of ASA interface. Make sure that the management interface is UP.
Use the link below to understand different scenarios you could use to have management access to IPS. in -x series :
http://www.cisco.com/c/en/us/support/docs/security/ips-sensor-software-version-71/113690-ips-config-mod-00.html
Rate if it helps.
Regards,
Akshay Rastogi