Does anybody know what this engine light message means?

 

Definition Evap leak detection pump pressure switch condition Explanation ECM detected the leak detection pump swith did change after solenoid was energized Probable Cause 1.-Leakdetection pump defective 2.-Open or shorted circuit condition 3. Solenoid defective

 

That's an error code from your leak detection pump. They're not serviceable- your only option is to replace it. Before you do though, check the vac lines running from the back of your intake manifold. You probably have a vacuum leak somewhere.