Tie rod? If you mean for the door lock problem, you'll have to look into it first. It could be a broken rod or a broken clip or the bell crank slipped out of it's axle... any number of things requiring somne parts or no parts to fix.
The check strap provides the detents for the door so it doesn't swing all the way open then come back and cut off your leg. There's a picture in FastLane though most of what you'll see is hidden in the door.