That install, is purely controlled by the car itself. The EVO enables the factory remote start in your bcm. It's the car that decides if it will start of not. So unless the EVO is not receiving the "hey tell the car to start" from the CS unit, not sure what to tell you. RED LED on the evo should be turning on, this will confirm it received the "tell the car to start itself" from the CS unit.
what is the 12 digit service number of the module?
Are you in datalink with the CS1900? if yes, what datalink protocol is the CS1900?
Does tthe red led turn on when the car does not start?
Does the car give 1 horn honk when it fails to start?