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Discussion Starter #1
To start, i have read the sticky posts about the hondamatic.
Some background, I do small engine repairs, a few years ago i put a short block on a zero turn for a landscaper and he burned me. So I went to his house and his garage was open, so i took a generator and a beat up 05 honda rancher 400 at and loaded it on to my trailer thinking he would pay me to get it back.. he didnt.

so over the past few years i threw some money at the rancher. rebuild suspension, steering etc. Head bolts were stripped out so i heli coiled it and installed new piston/rings and timing chain.

I finally get it all put back together and the engine runs fantastic. however, when i put it in revers it sputters and wants to kill the engine. First thing i did was remove the plug from the reverse switch, started it and reverse works great, i plug it back in and same thing happens..

I have swapped the switches with neutral, same thing, so its not the switch, i check continuity between the plug and ecu, its good.

Has anyone ever had or heard of someone who had this problem?
 

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Welcome aboard. Is the display showing R properly when you shift it into Reverse?
 

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Discussion Starter #3
Welcome aboard. Is the display showing R properly when you shift it into Reverse?
It lights up the red R light, sometimes i can get it to show the N R D on the display but not before it throws code 5 which i am trying to diagnose right now with service manual. it relates to the angle sensor which i dont think is causing my reverse problem because N and D work
 

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Discussion Starter #4
Also the angle sensor is getting 2.0 ohms. shouldnt it get 0 when its not turned at all?
 

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I'd post this over at hondaforeman.com, harag is the hondamatic wizard on that site, I'm sure he could help you.
 

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Have you changed the angle sensor to confirm its not the issue? You could try swapping the ECU also.
(Be sure to use known good brand, OEM or used OEM only, avoid China, eBay &Amazon parts like the plague!)

Have you cleaned all electronic connections (plugs)? Very often you'll find mud amd/or corrosion on the pins.
 

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Discussion Starter #7
I don't throw parts at things. The sensor is like 90 dollars and the ECU is almost 200. I have cleaned all the connections which were caked with mud. Also I haven't found an aftermarket ECU for the rancher 400 fa. Do you know of one?
 

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I don't throw parts at things. The sensor is like 90 dollars and the ECU is almost 200. I have cleaned all the connections which were caked with mud. Also I haven't found an aftermarket ECU for the rancher 400 fa. Do you know of one?
Where are you located? I have an old but good working ECU I've loaned out for diagnostic purposes before.

But first, what does the service manual say about ohm's and the angle sensor? I see you took measurements, but what is the acceptable range?
 
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