Hey I'm having problems with my 09 trx420fa not moving but it goes into gear could you help any

Hi Gimpster. I have an issue with a 2000 450 Foreman electric shift. I went through the Honda service manual several times. The conclusion was ECM. I couldn't find a machine to test the ECM on so I bought a new ECM. Still no shift. I found another machine and confirmed the ECM function. My dealer couldn't fix it. I've spoken to Honda. Excuses, evasivness, and their solution (translation):Let the dealer continue troubleshooting until he finds the problem or you run out of money.
I'm a 50 year old machinist/mechanic. This is the first machine I haven't been able to figure out.
One issue sticks in my mind. The res/black wire going to the shift switch shows 5V. The other two, blue/white and yellow/white, indicate they're grounded. If I jump the red/black to the blue/white, the yellow/white no longer shows continuity to ground but indicates 2V. If I jump the black/red to the yellow/white, then the blue/white is no longer a ground but it shows 2V.
Can you please help me with this?

Hey Gimpster.....was looking through some old posts about the Honda 420 cold start issue......mine also does this but with a twist....after it sits in the cold for awhile.....the fuel pump or injector( whatever it is) doesn't even make the buzzing noise and the light doesn't come on when i turn the key on? push it in the garage and let it sit for maybe an hour or so and its good to go? dealer tells me there's nothing wrong....how they can say that I have no idea! just wondering if you've come across any info on this issue since 2007

Very much appreciate any help or advice,

Thanks, Kess079