My car cranks , but does not turn over or start, I was told that CPS is faulty,

This might sound a little funny; however, I've had this problem in the past with my e 320 1994.Go to your car, and lock the trunk, which should lock all doors. Still while trunk is locked, unlock the door, then lock, and unlock once more, then try. One time I did all this, but while after locking doors and trunk, I then took off my battery leads and put them back on, maybe this reset somethin to it's default seeting, I don't know. Good luck.