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Old 03-01-2012, 02:01 PM   #1 (permalink)
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Manual Smart EHC memory/software check

I recently experienced a "power" shutdown as described by many on this forum yesterday. I have a 2008 18 LED EHC. Anyway, it was on the way to work so I coasted to a stop on the shoulder, removed the seat and noted every LED was lit except the PC Linked (far right forward LED). Of course, taking the key switch to off and back on restored everything to normal and off I went.

So, as I read my 2008 service manual page 13-39, I notice there is a manual memory/software check to help diagnose possible EHC related problems. I am not sure how many people know this. But, to start a memory check on the EHC, hold the left turn signal button in while you switch the key to the On position. The power-up circuit will not activate until the check is complete. All but the PC Link diagnostic LED will illuminate until the check is complete which is almost 3 seconds. If there is no fault, the power-up circuit turns on. I tried this and it work just fine and as described for no fault.

What I find interesting is that this is the same indications I saw when I lost power when riding to work yesterday except all the LEDs stayed lit until I took the key switch to OFF.

Does anyone know why this might happen?
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Old 03-01-2012, 02:02 PM   #2 (permalink)
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Because it's an EHC of course. There is no rhyme or reason to anything it does!
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Old 03-01-2012, 02:10 PM   #3 (permalink)
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I understand what you are saying Moe. I am going to try and figure this out. I ordered a new Braille just in case I have an intermittent cell problem that isn't showing itself on a load test when disconnected from the bike. I noted a starting issue which was like voltage had dropped too low but it could have been the compression releases. I have been pressing them prior to starting in case they were hanging up. I have also had one battery over 10 years ago give me a failing cell issue which was intermittent on my Triumph.

I also ordered the Big Dog Diagnostic software last night. I have check and cleaned every battery connection and the ground.

I am crossing my fingers that I can figure this out before it forcing me to install my WP on the shelf.

Huw
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Old 03-01-2012, 03:24 PM   #4 (permalink)
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Is your bike EFI or carb? The EFI version has a bank angle sensor (tip sensor) in it that will cause a shutdown like this and light all of the leds on the EHC.
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Old 03-01-2012, 11:23 PM   #5 (permalink)
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I have a carb,

The cause will either be an intermittent ground affecting all circuits or intermittent loss of voltage. Both of these are very short duration on the order of milliseconds. I am replacing the battery under warranty, plan on evaluating each connection to the battery terminals and looking at the ignition switch. The EHC is good based on its history and performance.

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Old 03-02-2012, 12:01 AM   #6 (permalink)
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Get rid of that POS ecu module, im doing mine right now, and when it comes off the dog, i will promply place it in the yard and pump 7 rounds of 357 into that POS....
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Old 03-02-2012, 01:25 AM   #7 (permalink)
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Quote:
Originally Posted by Nukeranger View Post
I have a carb,

The cause will either be an intermittent ground affecting all circuits or intermittent loss of voltage. Both of these are very short duration on the order of milliseconds. I am replacing the battery under warranty, plan on evaluating each connection to the battery terminals and looking at the ignition switch. The EHC is good based on its history and performance.

Huw
Your on the right track "Nuke" proceed with your diagnostics...it's the route I would take....I'm not convinced it's your EHC
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Old 03-02-2012, 01:38 AM   #8 (permalink)
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Your on the right track "Nuke" proceed with your diagnostics...it's the route I would take....I'm not convinced it's your EHC


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Old 03-02-2012, 02:52 AM   #9 (permalink)
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Get rid of that POS ecu module, im doing mine right now, and when it comes off the dog, i will promply place it in the yard and pump 7 rounds of 357 into that POS....
Mark, send me you EHC. I'll figure out if it is bad. I don't like the idea of destroying an EHC when it might be a good one!
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Old 03-02-2012, 02:55 AM   #10 (permalink)
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Yep,

I am pretty sure that the EHC is good. I would never give up on a Dog part!

Huw
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Old 03-02-2012, 01:47 PM   #11 (permalink)
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Pay close attention to the switch like you said Nuke. When it died I'm guessing it was like you turned the key off right? How would you test the switch? Wiggle test?
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Old 03-02-2012, 04:12 PM   #12 (permalink)
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Pay close attention to the switch like you said Nuke. When it died I'm guessing it was like you turned the key off right? How would you test the switch? Wiggle test?
The ignition switch may be hard to test and I might have to remove it. The wiggle test didn't do anything.
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Old 03-02-2012, 08:38 PM   #13 (permalink)
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The ignition switch may be hard to test and I might have to remove it. The wiggle test didn't do anything.
Maybe a little heat?

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Old 03-06-2012, 01:48 AM   #14 (permalink)
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If you have any friends with dogs in your area maybe you can swap with them just to test the theory? Anything I have in the way of switches isnt going to function properly on you newer bike. I may be able to dig one up. Keep us informed.
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Old 03-06-2012, 03:04 AM   #15 (permalink)
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Oh, I plan to. Yesterday, after riding over 50 miles, I came to a stop light and the bike turned off. But, for the first time it came back on electronically, then went off, then came back on. I hit the run button and start and off I went.
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