Haltech 2500

Hello, good afternoon I am writing to you because I am working on an elite 2500 in a Mitsubishi Lancer Evo IX. And the ecu gives me this code P0643. It is a car with a completely new engine. Could you help me with this error, which draws my attention a lot that even when The laptop is not connected to the ecu and when I open the map it still gives me the warning of this code

I believe this gets thrown if one of the AVI's is shorting to ground as it drops the AVI voltage under 5V.

Its possible you might have a faulty sensor or an issue in wiring.

I've seen this once, when i had pinned one sensor incorrectly. Re-pinned it correctly and issue when away.

Is the wiring new? You should check there isn't a short between the 5V and signal ground, or between the 5V and a 12V power. You might want to use a Voltmeter to measure the 5V at one of the sensors (like TPS). Is there a way to monitor the Reference Voltage (i.e. 5V) directly in the software?

Are you using a fuel pressure sensor with a 3 pin packard style connector?

I ask because intermittent connection issues are common with them.