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Seen in the logs: error codes 1115 and 1116. What are they?

Discussion in 'Roadster: Technical' started by gregd, Feb 28, 2016.

  1. gregd

    gregd Member

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    Hi folks,

    Just took a look at the logs from my trip last Monday, and I see a bunch of error codes 1115 and 1116 with time stamps thorughout the outgoing leg of the trip. There were no indications in the cabin of anything wrong, other than a couple of very momentary "power limited" messages. Those are seen in the logs as errors 1070, so perhaps 1115 and 1116 are somehow related. They did not occur during the drive home.

    The 1115s and 1116s are present right from when I started, to right when I arrived at the destination. Looking further back in the logs, I see them in reduced frequency back to about last November. Since the trip on Monday, no further occurrences.

    I don't see either code listed in the Wiki. Any idea what they refer to? Wondering if something is loose...
     
  2. PV-EV

    PV-EV Member

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    Those are motor temperature sensor warnings. Is there a 'rank' associated with them, like 1...4?
     
  3. gregd

    gregd Member

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    No details in the log, at least that I saw decoded. But how can there possibly be a temp warning within a few minutes of when I first started driving, around city streets, with the ambient temp in the mid-40's F?

    Sounds like a loose sensor or connection... I'll have them check it out at the next yearly service next month. Thanks!
     
  4. PV-EV

    PV-EV Member

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    Those warnings are for the sensors, not the temperatures.
     
  5. gregd

    gregd Member

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    Ah, ok. Sorry, I misunderstood. So, I presume nothing critical, and one that can wait until next month, especially since it seems to have gone away...

    Where would I find the Rank information?
     
  6. PV-EV

    PV-EV Member

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    I'm not sure where the rank is found. It should be in the log somewhere. The sensors are RTD's in the motor. Could be the sensor, the wire harness, the connectors or the PEM. Best to let service check it out.
     
  7. rgjones

    rgjones Member

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    1115: DMC FW: Motor Temp Sensor 2 warning
    1116: DMC FW: Motor Temp Sensors Differ warning

    Courtesy of the Tesla Tattler 'decode' command which can decode all Roadster errors and warnings.
     
  8. gregd

    gregd Member

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    So, had the annual service yesterday. The SC confirmed the problem with the sensors, though they seem to be confused a little about whether the motor is actually running hot or not. Things were pretty clogged up (normal road vacuuming duties), but even after that, they say there's still a problem.

    Unfortunately, the sensor is not replaceable by itself. New motor is $10k, but they will see what they can do about either a discount or perhaps some sort of swap.

    If the temperature isn't really running hot, then the only down-side of leaving things as they are is that the car might think it needs to shut down at an inopportune time. Given that risk, I probably need to have this fixed before Summer.

    If the motor really is still running hot after being cleaned, then there's a big mystery, because it's not been driven in a manner that should do that. I'm tempted to ask them to double check their diagnosis, and get an independent measurement of motor temps.

    Anybody have any similar experience, or thoughts on what could cause a motor to run hot like that?
     
  9. hcsharp

    hcsharp Active Member

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    When you first turn the car on in the morning before it's been driven, what temp does it show?

    Check the motor temperature with an Infrared digital thermometer gun. Compare it to the reading on the VDS in the car. Do the same thing with another Roadster and see how they compare.
     
  10. gregd

    gregd Member

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    The motor is cold in the morning, VDS has it in the first block. Battery is one block higher. Motor gets to the 2nd or 3rd block during the commute. Looking at the logs, I see a nice gradual rise in motor temp since having done the Maintenance. They said things were "pretty plugged up", so I probably had two problems - legitimately high temps due to lack of air flow, and a flaky temperature sensor. The run home after the maintenance (my up-hill trip) had a burst of 1115/1116 errors and a 1070 towards the end of the trip, about 7 min from home. That would have been about at the point where I crest the big hill into town, and have some more gentle up and down rolling stuff before a big downhill regen at the freeway exit. Note the motor temp... all really normal stuff. See the attached screen capture from the log tool... First part is stop and go freeway getting out of one town, then the drive up the hill, through destination town, to the exit, then final course home. The errors were about at the 26 minute mark, plus or minus.

    drive home 032916.png

    So, I think the only remaining issue is the flaky sensor, and the issue that the car could freak out if it thought the motor were hot when it's not. The risk of that (or anything else?), and what sort of deal the SC can work out with the factory, would determine whether to swap the motor.

    One last thought... the main group of 1115/1116 errors occurred after a range charge, during a range drive, and now seem to be associated with regen, e.g. stop and go traffic.. Is there something in the non-motor part of the drive train (inverter?) that's really the root cause? Where physically is this sensor located?
     
  11. gregd

    gregd Member

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    Hi folks,

    A quick update on this... I've done some poking around in the logs, and notice that a number of the 1115/1116 errors have been AFTER a drive is completed, car not moving. Odd. On one example day I made note of what I did and I compared times in the logs. The errors occurred during CHARGING. I do only 24 amps here at home, 240v, so this isn't a high stress item. It also explains the timing of the some of other examples, which seem to correspond to when regen is active.

    Since the SC wants to replace the drive train to fix this (Yike$$$!) I'm wondering if they've really got it diagnosed properly. Didn't Tesla remove the motor from the charging circuit at some point in the development? I have a 2.0 non-Sport model. Obviously during regen the motor is involved (as a generator), but not during a home charge.

    Right?
     
  12. dhrivnak

    dhrivnak Active Member

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    I was told the 1.5 used the motor as an inductor during charging which is why I get random charging errors during very humid times saying there is current leakage. So when damp I charge right after a drive while the motor is warm. So yes it sounded the motor is not in the loop for later models. Which unfortunately does not help you much.
     
  13. gregd

    gregd Member

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    Anything that can eliminate potential causes for the error helps, especially if they are expensive. Thanks!
     
  14. hcsharp

    hcsharp Active Member

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    Nice work detecting that it happens during charging (regen or grid). I don't have any answers but agree there's a good chance they misdiagnosed at the SC. I'll keep thinking about it.
     

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