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No Spark on 09 Rancher 420

74K views 56 replies 17 participants last post by  907josh  
#1 ·
Okay guys, before I push this quad out in the yard and burn it to the ground, I would like some advice. I picked up this 09 Rancher 420 AT IRS for my wife.. long story short, I tore the complete bike down and rebuilt it.. Before i did that it ran find, smoked a little, needed some bearings and etc... Now, I got it all back together and no spark! The ignition coil has power to both wires with the switch on.. but the brand new spark plug isnt sparking! Any idea's? Thanks guys.
 

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#30 ·
You could have a bad coil -- only way to tell is to use a peak voltage adapter with the meter or a meter that will read peak volts. -- the G/Y wire of the coil to ground should have over a 100 Volts on it, when using a meter that will read peak volts to test it. The coil has 12 VDC on it all the time with the key on -- the PCM pulses the G/Y wire (pulls the coil to ground to fire the plug)
 
#33 ·
Before you burn it down take the time to go back through and check all of the simple things like battery voltage, loose connections, wires plugged in wrong etc. Did you take off the handle bars? Maybe some how the kill switch is malfunctioning? I am wondering about the ecm or whatever functions as the computer for the efi. Did you have a honda dealer plug it into a laptop? I am not sure if that is how honda checks the computer on their machines but Canam does. If you change out a fuse and take your canam to a dealer and they plug it up to their BUDS system it will tell them which fuse you changed. If honda has that system they should be able to tell you what the issue is. I think you mentioned that your honda dealer was not great. I would search online for a better dealer in your area. How far are you from Charlotte, NC? Worst case scenerio I would buy it as a parts quad.
 
#34 ·
When I wasn't getting spark on my FM 420 it was the fuel injection relay. It was clicking, but wasn't making a good enough connection to fire/run.

Melatv suggested I run a jumper wire from + on battery to red/black wire on coil and see if it fired. It did, so from there it was just tracing back till I ended up at the FI relay.

At least all you bought was a new coil. I bought a new PGM-FI module and it didn't change anything
 
#35 · (Edited)
So with a bad fuel injection relay would the Bike still turn over? My bike turns over fine, just no spark. Yh I knew the Black/red wire goes from Fuel injection relay relay to coil and also from coil to ECM. Still lost on this thing, really dont wanna take it to a dealer when I can do the work myself.

Also, I tried the jumper wire from the + side of battery to the blk/red wire on the coil. The bike is doing the same thing, just turning over and not getting any spark.

Any help here guys? Thanks again.
 
#40 · (Edited)
You really need a Peak Voltage adapter to test the CKP sensor & the Ign. coil -- I built my own. You can use a toggle switch if you can't find a push button switch, the push button is used to discharged the cap. so you can't get a shock when disconnecting the meter.
 

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#41 ·
Update....

Ok guys, Im completely lost! Ive replaced the coil, rectifier, ECM and starter rely, and spark plug... Ive ripped open the wire harness and ran every wire and check them.. I still have NO dang SPARK! Any ideas? Im getting ready to ripped the whole bike apart and start selling it piece by piece on EBAY!
 
#42 ·
There are 2 relays, an engine stop relay and the fuel pump relay, which one did you replace? They are both the same anyway, try swapping them temporarily to see if you get spark. If no then look at the bank angle sensor again. After all the stuff you changed there are no other components to fail besides the stator inside the engine.
 
#44 ·
Ive replaced the i wanna say the fuel pump rely, that is bk with the computer. Where is the starter rely? Ive played withe the kill switch, its in the middle position and the bike turns over fine, just no spark. If I push it to the left or the right the bike wont do anything. Now the Bank angle sensor... I have three wires coming from it.. A green wire (Ground) a red/white wire (?) and a black/red wire (hot wire).. My question, is the red and white supposed to be hot? Thanks guys.
 
#46 ·
Like I have said before the only way to check the system you need a Peak voltage adapter. If the CKP sensor is not seeing the speed of the crank the bike will get no spark, which you need a Peak voltage adapter to test it. You have said you have voltage on the Ign. coil that proves that the fuses are good -- bank angle sensor is good -- engine stop relay is good. You will see voltage both sides of the Ign. coil with a little less on the G/Y side compared to the Bl/R side. The PCM places 200 volts on the G/Y side of the coil which can only be read with a Peak voltage adapter.
 
#48 ·
Is there a way to do a TPS relearn?