Front Collision TESLA P85. Repair and Troubleshooting Help Needed.

[kennybobby]

What is that thang?

Some sort of terminal thermal protection device/ breaker...? It wouldn't prevent the main contactors from closing, but would open the HV to the front of the car, and open the dc feed from the chargers to the pack.

 

[KidDoc]

I don't have any useful input but I find this thread fascinating! I was disappointed when I finally read through all 22 pages and there is not yet a conclusion.

 

[Kalud]

I don't have any useful input but I find this thread fascinating! I was disappointed when I finally read through all 22 pages and there is not yet a conclusion.

Stay tuned, I feel like this is going to a happy ending in the next couple hours

 

[mikes_fsd]

Stay tuned, I feel like this is going to a happy ending in the next couple hours

Well?!? where is the update?

 

[Yauheni]

I dont have any good news yet. Yesterday, i connected pin 1 & 2 to the DCDC pin 4 was disconnected and supplied with 10V on it, wires 5 & 6 connected together, all HV covers are closed, emergency plug is intact, all looked good to me, after connecting 12V battery contractors didnt close. So I just have no idea what could be wrong.
Maybe BMS got damaged after i put voltage on it last week?! Not sure, however the contractors were closing before i changed 100amp fuse. I dont know what else i can do right now.

 

[Ingineer]

Did you make the checks on the HVIL I proposed above?

 

[Yauheni]

I got the scheem, however i didnt check it yet. I dont really know how should i check it.

 

[Ingineer]

This is what I posted:

You can verify all the front interlocks by unplugging the 6-pin connector from the DC-DC and verifying that you have continuity between pins 5 & 6 on the DC-DC itself. If you don't then one of the connectors or the high-voltage cable connection cover isn't seated right.

You can verify the rear interlock by unplugging the 12 pin connector from the charger and checking for 60 ohm resistance between pins 3 & 9 on the charger itself. If this is open then it's most likely the lid switch on the high voltage box isn't secured correctly with the right fasteners.

If the car has 2 chargers, then also check pins 3 & 9 on the second charger.

 

[Yauheni]

I just checked what you advised and this is what I got:
1. DCDC converter: pins 5&6 have continuity.
2. Drivers side charger has 62 Ohm on pins 3 & 9.
3. Passenger side has NO resistance on pins 3 & 9.

 

[Ingineer]

Well, the passenger side should be the same as the drivers, which tells me that you haven't properly secured the cover to the HV box where the fuse was replaced. You must have forgot to tighten a bolt, or something isn't on quite right.

 

[Yauheni]

Should i check resistance when 12v battery disconnected??? If so, then how does the car know that the cover is on or off?

I put cover like it was with 6 screws. I see the sensor on the cover.

 

[Yauheni]

 

[Yauheni]

 

[Ingineer]

Doesn't matter if you check it w/o power, since you are unplugging the connector, but it's probably good to leave it disconnected so you don't set more fault codes.

If the connector on the passenger charger is reading open, then it's the interlock somehow. Check all the connectors and make sure they are seated.

 

[Yauheni]

I just rechecked the resistance on chargers and same thing, slave charger has 62 Ohms while main one has no resistance. Very interesting.

 

[Ingineer]

You'll have to figure out why. Temporarily short the interlock sensor pins and re-check the resistance. This will tell you for sure.

 

[spaceballs]

Should i check resistance when 12v battery disconnected??? If so, then how does the car know that the cover is on or off?

I put cover like it was with 6 screws. I see the sensor on the cover.

Can you put the lid on wrong, i.e. rotated by 180? Make sure you have both parts next to each other i.e..

I'm getting bad vibe due to lack of electronics knowledge, maybe find local EE guy for help?

 

[Yauheni]

This cover is not possible to put other than how it suppose to be. Its not flat, so there is only one way to put it.

 

[Yauheni]

HALLELUJAH))) CAR STARTS, RUNS AND DRIVES BY ITSELF. THANK YOU EVERYONE SO MUCH!!! I CANT BELIEVE IT. THERE ARE NO ERROR MESSAGES AT ALL.
For some reason, after i opened up the HVJB the sensor stopped working, that was the problem. Now car charges, heat working, meaning that DCDC works good.

Thanks to all )

 

[Gabzqc]

HALLELUJAH))) CAR STARTS, RUNS AND DRIVES BY ITSELF. THANK YOU EVERYONE SO MUCH!!! I CANT BELIEVE IT. THERE ARE NO ERROR MESSAGES AT ALL.
For some reason, after i opened up the HVJB the sensor stopped working, that was the problem. Now car charges, heat working, meaning that DCDC works good.

Thanks to all )

CONGRATS!!!