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Hi, this is Barry and I would be happy to help. What model is your 2001 Honda?
Ok. Can you tell me what the outside temperature is where you are and the low side pressure reading with the AC off?
Ok. With the AC turned on there should be ground on the blue wire going to the ac pressure switch. Does it have ground?
Also what is the high side pressure with the ac off?
Ok. That should be about right. The pressure switch supplies a ground signal from the blue wire to the blue/white wire when the pressures are correct. If they are high or low it disconnects the ground signal. So let's check and make sure you have a ground on the blue wire. If so I suspect you have a bad pressure switch.
Ok. That wire goes to the HVAC control module. It is in connector A position 4. I would check the continuity of that wire from the control module to the pressure switch. In the same connector on pin 13 should be a black wire it need to have ground.
Ok. Does it have a ground on the black wire pin #13?
It appears that your problem is in the HVAC control panel. As it is what creates the ground for the pressure switch circuit. With no ground coming from the control the ecm sees it as the same as the the pressure switch cutting off.
Just let me know if you need anything else.