you are correct that the engine is a 203 PS, the Titanium Sport X is actually a trim level rather than referring to the engine, the S -max is available with either the 199, 203 or 240 PS engines although the 199 PS TNWB engine isn't' usually seen in the UK. Below shows confirmation of the engine power output of your car.
With regard to the DRL, there was a change over period where the cars had DRLs but also the standard side lamp in the front fog lamp, these cars didn't allow the DRLs to be illuminated when the lights were on, on a later car without the standard side lamp the DRLs should be on with the headlamp or parking lamps but dimmer than they are when acting as DRLs as they act as position lamps.
From memory if the DRL connector has 3 pins it should be the later system, the earlier 2 pin wiring can be altered but new lamps and a bumper harness is required plus the car configuration needs checking and modifying if necessary.
Given the build date of your car it should be the later system, if this is the case then the DRLs should be on with the lights on, if they aren't then there is a fault.
So in simple terms the DRL operation depends on if the car has standard front position lamps in the front foglamps.
I hope this helps but if I can assist further let me know and I'll reply as soon as I'm able to.