Charging: Stopped by System Malfunction
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There is a beautiful and correct solution \ with the preservation of the functions of the system.
A diagram of a new selfmade HVIL electrical circuit that performs the same function of ensuring electrical safety.
https://alflash.com.ua/2019/to_rav4ev/ch_hvil.jpg
The jumper and reed switch are from the old circuit, and the resistance is 60 Ohm and the wires are different. I assume that this is a simpler repair method than searching for the break or installing another charger.
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davewill
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Improve_RAV4EV
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Thanx, but little bit too late. Next time.
Is the Reed Switch actually a diode?
What are the specs of this component, please?
Yes, I agree. And in the charger, this is done by a jumper
https://alflash.com.ua/2019/to_rav4ev/charger_jumper.jpg
and a reed switch, which perform the function. They and a 60 Ohm resistor must be "in action" to comply with the current mode.
Although, as I understand it, the jumper in the RAV4EV charger is useless.
A reed switch is a sealed contact pair that closes under the influence of a magnetic field. Removing the charger cover removes the magnet and the reed switch opens, and the HVIL circuit is open.
With this repair method, this resistor should have been placed on the back of the male D4 connector
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p.s. As Tesla teaches, "opening the lid while driving", that is, opening the HVIL line while the car is moving, will not cause the contactors to open.Probably in case somebody opens the OBC lid while driving
Improve_RAV4EV
Well-known member
I meant the HV electrocution, if he opens the lid and touches HV.
Without the external jumper J5, you'll never get a reading at X042 (D4) 3 & 9. It's a required loopback to complete the HVIL circuit.
Matt mentioned this in post #9, "For now you can just do the black low voltage connector on the OBC driver's side, and skip the AC and HV connections until later (but do make sure the white jumper connection at that end of the charger is still installed)."
Matt again in post #69, " . . . there should be a little jumper plugged into the white three pin connector (refer to middle picture of post #43 above). It's pretty easy to knock this jumper out while moving things around."
[A non-sequitur here, but for future readers: the external jumper J5's purpose is to allow interfacing with the Rear HVJB's Lid Switch in a Tesla Model S/X. It's also used when an optional Dual Charger configuration was purchased for those models, as the second OBC doesn't interface with the Rear HVJB. Since there is no Rear HVJB in the RAV4 EV, there's a jumper installed -- always.]
Unsubscribed.
Improve_RAV4EV
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If you remember, before removing the OBC (J5 was in place), I made a little harness and connected it to pins 3 & 9 of X042 to read the Ohms. It showed OL.
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Improve_RAV4EV
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I put the OBC in the car and connected all the cables, including HV & AC.
Connected my little harness to X042 and checked pins 3 & 9. It first jumped around, then showed 67 Ohms.
I did another measurement, this time it stabilized at 72 Ohms.
Connected my little harness to X042 and checked pins 3 & 9. It first jumped around, then showed 67 Ohms.
I did another measurement, this time it stabilized at 72 Ohms.
In other words, the jumper in the RAV4EV charger is an atavism that does not perform the main protection function, but which must be present so that the HVIL line is not broken.
Disconnecting the HV wire connection box from the charger will not lead to a break in the HVIL line.
Therefore, the connection with the J5 jumper can be duplicated in another place inside the charger (as shown in #122)?
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As you have now installed a permanent 60 ohm resistor inside the OBC, I would suggest removing the J5 jumper. If the open circuit was caused by a trace lifting off a PCB, it's possibly that this same trace could someday re-establish contact, creating another 60 ohm resistor in parallel. I can't say for sure if the BMS would care about 30 vs 60 ohms, but removing J5 jumper ensures this won't be a possibility.
Hopefully you now have a green light in TPD for the HVIL
davewill
Well-known member
If this turns out to be the permanent solution, I'd be concerned about someone in the future reinstalling the jumper thinking it's just missing. I'd either clip one of the wires inside, or put a label on the outside stating it shouldn't be installed.
Improve_RAV4EV
Well-known member
As you have now installed a permanent 60 ohm resistor inside the OBC, I would suggest removing the J5 jumper. If the open circuit was caused by a trace lifting off a PCB, it's possibly that this same trace could someday re-establish contact, creating another 60 ohm resistor in parallel. I can't say for sure if the BMS would care about 30 vs 60 ohms, but removing J5 jumper ensures this won't be a possibility.
Hopefully you now have a green light in TPD for the HVIL
Nothing to worry about, 'cause TPD still gives HVIL error, as I was suspecting.
I wonder if this could be a Firmware problem and updating it to V1.1.103 would remove the f008 code. I'd like to give it a try, but, could I do the update, without clearing the f008 first? Would doing it with f008 create a SW problem this time?
Lastly, would replacing the OBC solve the problem? Should I do a Firmware update, after replacing it?
Where does the update go? Into OBC? BMS? DCDC? Gateway? All of them?? Probably mainly into Gateway computer.
By the way, Tesla could have avoided the "slalom" of the HVIL line wires in the charger, and installed a 60 Ohm resistor in this jumper. As it was done for the Proximity resistor (2.7 kOhm) of the charging port.
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Improve_RAV4EV
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Please, don't get upset. I wanted to test and prove that the problem is not simply a broken line or something.
By doing this, I wanted to prove that the problem is NOT the HVIL, it is something else in the OBC that triggers an f008 code.
I did this to end our struggle and save time.
Correct me if I am mistaken.
Thank you for your wonderful explanations.
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