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Old 02-04-2014, 12:57 AM   #1
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ECU turning on/off/on/off

Basically it seems like my ECU is turning on and off over and over. It starts just by turning the power on. All lights on the display light up. The Do Not Shift light blinks with it.

I can't get to diagnostic codes because it resets too fast.

Any clues where to start looking?
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Old 02-04-2014, 02:35 AM   #2
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Quote:
Originally Posted by RufussSewell View Post
Basically it seems like my ECU is turning on and off over and over. It starts just by turning the power on. All lights on the display light up. The Do Not Shift light blinks with it.

I can't get to diagnostic codes because it resets too fast.

Any clues where to start looking?
what kinda rv do you have?
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Old 02-04-2014, 04:57 AM   #3
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Based upon your description it sounds as if an automatic resettable 12vdc breaker is either failing or something powered downstream of it is shorting, causing it to trip, reset, trip reset, etc. Perhaps with the help of someone else listening for the telltale click, click click in the electronics bay while you have the key on you may be able to better locate it. Typically the MDxxxx transmissions on the older coaches will have their own separate power supply straight from either the house or chassis batteries - I have found them wired both ways. However, as mentioned in the response above, we've no information on your particular vehicle to try to help any further......
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Old 02-04-2014, 05:57 AM   #4
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Sorry about that. It's a 37' 1997 Beaver Patriot with a Cat 330 Diesel engine. It's an Allison MD3060.
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Old 02-04-2014, 06:15 AM   #5
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Yep, the fuse box for the transmission is clicking loud. I switched out the two 10a fuses but it still clicks. Should I buy a new Bosch relay and start switching them out?
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Old 02-04-2014, 05:23 PM   #6
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You still haven't identified if it's an auto-resettable breaker that is tripping and resetting causing your problem. I doubt it's any of these 'ice cube' type relays that are causing your problem - but instead whatever is powering them upstream. A volt meter and chasing down the power to the TCM right now would be the best angle of attack.
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Old 02-12-2014, 06:25 AM   #7
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Alright, it looks like 12vdc is leaving the chassis batteries and getting to the auto-resettable breaker panel.

There are 2x 10a fuses in the transmission relay box pictured above. They are fine.

There appears to be continuity between each side of all the auto resettable breakers.

Any clue where to look next?
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Old 02-12-2014, 08:40 AM   #8
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Make sure the harnesses are fully seated, perhaps corrosion on a pin?
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Old 02-13-2014, 01:02 AM   #9
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I wonder if it's bad chassis batteries?!? Could that affect the transmission?
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Old 02-13-2014, 01:24 AM   #10
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Quote:
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Make sure the harnesses are fully seated, perhaps corrosion on a pin?
Do you mean at the battery?

I took all the connections off the battery and cleaned them with water and baking soda. Still the same deal.

It seems like something is killing the battery now. Each day the voltage is low and I have to charge it with my car for the engine to start. Once it starts the on/off of the transmission comes back.

The panel with all the breakers looks very clean and tight. No corrosion or loose bolts.
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Old 02-13-2014, 10:03 AM   #11
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Rufuss, I had a situation with my coach where I lost power to the transmission controller. Turned out to be a connector located in one of the cargo bays that had worked itself loose (probably even I was loading the coach). The weather proofing boot of the connector was still in place but the connector itself went intermittent. This caused the ecu to shoot down the coach.

Long shot but thought you might want to check connectors in the bays.

Steve
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Old 02-19-2014, 05:31 PM   #12
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On the Beavers and Monaco's there is a butt connector on the 12 gauge power wire coming off the positive terminal of the chassis battery. This connector is a known problem in coming loose or totally coming apart. It is located in or close to the battery compartment.
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