Feedback Score: 0 reviews
Join Date: Jan 2011
Location: Smack in the middle of Illinois
Thanked 293 Times in 288 Posts
Not that I am aware of, but the more technology they incorporate into the design, the more problems that arise and it all points to the ECM, but if the ECM is getting faulty signals due to faulty connections all kinds of weird shit happens. Not every scenario is covered in the service manual. I was working on one (not Honda) that specified a ground connection at a pin on the CDI when the key switch was on but no connection when the switch was off. It had just the opposite - turned out to be a faulty ground on the brake light and coincidentally a broken filament in the taillight bulb shorting the brake light to the taillight inside the bulb - the CDI was looking for an 0 input at the pin when the brake light was on - due to the faulty ground at the brake light, the light would not illuminate and caused a 1 input at the CDI preventing spark. I had a clue the ignition system was working because it generated one spark each time the key was turned on and one spark when turned off. Repaired the ground and installed a new bulb and spark was restored.
You will have to play with it a bit more to try to determine if it's heat related - both engine heat and electrical component heat - turn the key on and wait 10 minutes and check the shifting - if it shifts immediately upon energizing the system, but fails to shift after 10 minutes with the key on but with the engine not running, then the problem is probably a faulty electrical component - if it shifts fine after setting turned on without the engine running, then quits after running the engine, it could still be an electrical issue, but you need to determine how long it has to run and at what speed and at what engine temperature the shifting fails - it might be heat related to the engine.
Good luck and let me know what you determine.