Melatv

Hi -- The green/yellow should read infinity -- that wire is pulled to ground by the PCM -- unplug the Gray 33P connector from the PCM -- unplug the Green/yellow wire on the coil and check that wire for continuity of that wire to ground -- it should read infinity -- if it does the PCM is at fault.

HI @Green Bay Mike -- are touching the gas lever when starting -- if so don't

What is cause of the gouges on the fly wheel ? must be loose metal some where

HI @retro & @jeepwm69 I would un tape everything around that solder connector -- make everything right and try it. If still a problem then ECM or other things are the problem. The harness is a good deal if the person is willing to buy it first without cost to you.

Hi -- the wires with just the insulation covering just chew off -- use Permatex Liquid Electrical Tape -- I don't like using those heat shrink tubes with solder in them -- because the wires have to be perfectly clean -- solder the connections tape them good -or use crimped connectors and liquid tape the ends.

I see chewed wires there and other things that would cause the problem -- @retro good to find time to help out.

Yes

Do this again and let me know

Okay

Unplug the green connector (14pin) going to the display meter --see if voltage goes up

With black meter lead on neg of battery -- check the voltage on each little gray dot on top of ign. fuse

Can stick a pin or something sharp into the Bl/R wire at the fuse block to take a reading

Okay will look for another spot

Could you check the voltage on the BL/R wire on the fuel injector

Okay you are dropping the voltage someplace else -- I will check some other points for you

Check this -- unplug the ign. switch -- you said there were 2 red wires -- do this use the black wire on the harness side of the ign. switch and jumper it to one of the red wires on harness -- then check for 12 volts on the ign. coil -- if no 12 volts jumper the black to other red and check coil again.

Yes

@jeepwm69 remove the jumper and measure the voltage on the ign. coil -- if it's low you may have a problem with the ign. fuse holder

Take a wire and place it in along side the Bl/R of the ign coil to the positive of battery -- check for 12 volts on the unplugged gray connector Bl/R wire

Check the Ign fuse

Hi @jeepwm69 unplug the ign. switch and put a jumper between the Red & Black wire on the harness side -- check voltage on ign. coil.

Hi Patrik: Good to see you fixed the problem -- here is something you may already know about the Pull start Pull start TRX420 The pull start on my TRX 420 auto/es - EFI-- Has a pull start kit that came with a new harness, condenser, rectifier (diode) and relay. It will not start on a dead battery or battery disconnected. It also states with the instructions that the pull start is only to be used to start the engine when the battery is low. So in my case the pull start is no good to me if the battery is dead and they can fail when needed. So I carry a booster pack I did some testing on my TRX 420 before – This is what I have found as soon as the key is turn on the console lamps discharged the condenser right away, before I could pull the pull start. Also check the system out and found that the condenser has to power the following. Engine stop relay Fuel pump relay to start fuel pump Fuel injector Ignition coil Light up console lamps

Hi: Check this -- go to my post 6.57 PM look at the 2nd picture bottom right hand unplug the 2 small connectors Diode & Condenser check voltage on both red wires --what did you find?

Do this unplug the Key Switch -- on the connector side jumper the Red & Black wires together -- check the voltage on the ign. fuse

Hi: Like I said above disconnect the KEY Switch and measure the resistance across the red & Black wires -- should read zero -- I have replaced a few key switches on the 420 Hondas