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Olugly
Novice
Jun 4, 2016, 12:29 AM
Post #1 of 12
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2006 Nissan Quest. Transmission and ecm are loosing communication cause van to enter limp mode. I can't remember the code they pulled but it was a " no comm" between them. When it enters limp mode you can pull over and restart the van and will drive fine. I was told this van has a TCM located under the steering column and is very likely my problem. Anyone had this problem? Is that the location of the TCM? Thanks
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gsferraro
Veteran
Jun 4, 2016, 3:37 AM
Post #2 of 12
(4492 views)
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Re: Nissan Quest TCM
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Hello,
If you can get the code number that would help. I use a program called mitchell on demand,shop key pro, its saying the tcm is located behind right side of dash. Did they pull the code from the tcm? If you can get the code number i can do a search for a possible TSB, but in the past when i had comm. codes, i found bad connections, bad grounds and bad computers. Gary
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Olugly
Novice
Jun 4, 2016, 6:21 AM
Post #3 of 12
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Re: Nissan Quest TCM
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I believe I overheard them say the code was a U1010 no comm ( loss of rpm signal)code between the ecu and transmission. The ecu was sent off and tested and came back with no faults. The van will enter limp mode mainly under hard acceleration, sometimes under normal acceleration and in park while revving the engine around 3k rpm and sometimes we can go days without anything. It always resets when you pull over and cut the van off and restart.
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Olugly
Novice
Jun 4, 2016, 7:22 AM
Post #4 of 12
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Re: Nissan Quest TCM
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Or a U1001..
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 4, 2016, 7:30 AM
Post #5 of 12
(4475 views)
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Re: Nissan Quest TCM
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Was a full system scan done? Are there any other codes stored in any other modules?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Olugly
Novice
Jun 4, 2016, 7:51 AM
Post #6 of 12
(4471 views)
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Re: Nissan Quest TCM
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As far as I know, no. It's just a local shop, the dealer is over 100 miles away so I'm sure they are limited . Actually this is the third shop and they all just keep telling me communication is being lost between the ecu / transmission ( loss of RPM signal). It's not a everyday problem that it goes into limp mode. I'm going to recheck grounds today.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 4, 2016, 8:07 AM
Post #7 of 12
(4470 views)
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Re: Nissan Quest TCM
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Which module set the U1001?
Read this so you get a better understanding what your dealing with.
http://www.370zcoupe.com/TSB/1SW33.pdf
CAN codes can be difficult to solve especially when they are intermittent. It is important to figure out if there are any other codes being stored in any other modules. It doesn't hurt to check grounds as you stated. It would also be important to make sure your battery connections and your battery checks out good. Checking charging system operation and for excessive AC ripple would be important too. Your problem may require the use of a high end scan tool and a digital oscilloscope to catch the glitch in the data bus along with powers and grounds at the suspect control module.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jun 4, 2016, 8:22 AM)
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Olugly
Novice
Jun 4, 2016, 8:50 AM
Post #8 of 12
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Re: Nissan Quest TCM
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I just called a guy that works there. He said from what the mechanic told him it was being set by the transmission. But that still confuses me how it will set the code and enter limp mode in park revving the engine. I'm reading a bulletin from Nissan about TCMs now
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 4, 2016, 8:58 AM
Post #9 of 12
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Re: Nissan Quest TCM
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That is kind of strange the problem occurs revving the engine. I would definitely check battery connections, battery condition, and excessive alternator AC ripple/performance just to rule those things out. Does the engine have a hard time starting or delayed starting? Are there any other symptoms besides the transmission defaulting? As stated in the bulletin, the module setting the code usually isn't the culprit.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Olugly
Novice
Jun 4, 2016, 9:22 AM
Post #10 of 12
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Re: Nissan Quest TCM
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No other problems. Starts fine, runs fine. We have drove it all week and it's only entered limp mode twice. It seems if it warms up a bit it has less problems. I'm check wiring now
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Discretesignals
Ultimate Carjunky
/ Moderator
Jun 4, 2016, 9:43 AM
Post #11 of 12
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Re: Nissan Quest TCM
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Maybe Gary has run into this issue since it causes a transmission default concern. Watch out for the silver bullet approach when it comes to module issues. Just because someone else fixed their issue by replacing something, doesn't mean it will fix yours. I've seen people and myself get burned using the silver bullet approach. My motto now is, "Test. Don't guess."
I just hate to see you pay $700+ for a TCM and programming and it not be the issue. Usually when it comes to modules, you eliminate every other possible reason before condemning it. Even when you isolate the culprit to the module, there is always that apprehension that you are not 100% sure of your diagnosis. You just try to raise the odds by turning over each stone and exploring every avenue that you can think of. That kind of skill comes with experience.
It would be interesting to actually see this glitch on a scope. The ECM is the one setting the U1001, so it is still important to figure out if there are any modules on the network setting U codes. Obviously if the TCM loses communications with the ECM, it is going to default. It just sucks because it is so intermittent which is a mechanic's worst nightmare most the time.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jun 4, 2016, 9:55 AM)
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Olugly
Novice
Jun 5, 2016, 10:08 AM
Post #12 of 12
(4424 views)
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Re: Nissan Quest TCM
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Ok guys here's the latest update. Usually when the van enters limp mode, the check engine and TCS light comes on. After restarting the van, the TCS goes out and the check engine light stays on. The codes have NOT been reset. I started the van this morning, no check engine light. I drive down the road and within 20 seconds the van starts lunging ( kind of like stepping on the gas then hitting the brake a few times). I pull over, restart the van, no check engine light, no TCS and we go about our business. Drove home 1 hour later and no problems. I tried to see if any codes were stored and nothing. I talked with the mech at the shop yesterday and he said it was a transmission sensor. I checked all the connections and grounds yesterday.. I wonder if I might have "wiggled" the problem. Also called the Nissan service dept yesterday, the guy I talked with said if it was the TCM, to pull one with the same part number and swap them. He said they were plug and play, needing no tuning. I found a few for $70-$100.
(This post was edited by Olugly on Jun 5, 2016, 11:07 AM)
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