This code popped out after replacing waterpump on 2000accord2.3vtec I dont know if I damaged the wires or sensors when removing the timing belts

 

Are you sure about the code # (P1631)? I checked the Honda Shop Manual and no code 1631 is listed, so no guidance is available.

Suggest performing a Reset w/ OBD2 scanner and see if same or another code returns.

good luck

PS I moved your post to correct forum.

 

Probably P1361 - TDC 1 sensor intermittent interruption. Check harness connector and wiring first.