laoczi2007
Posts: 9
Joined: Wed Nov 11, 2020 12:33 pm

Re: Gen2 J1772 EVSE signals shorted to AC

Thu Nov 12, 2020 1:22 pm

kiev wrote:But it also holds the DTCs and if you are able to read those, then it would indicate some functionality still exists. So maybe the internal damage is limited and repairable?


I agree with the assumption that the basic functions of the EV-ECU are retained. Initially, when connecting the diagnostic program, I was able to erase 4 error messages. Most likely they appeared after a dead 12 volt battery. And the most interesting thing is that after that, one new error appeared that can no longer be erased - P1B2A. I assume that this is a short circuit in the EV-ECU.

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kiev
Posts: 1356
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Gen2 OBC and DCDC pictures

Thu Nov 12, 2020 2:44 pm

This is for troubleshooting the DTC P1B2A on a 2012, but may give you some ideas.

http://mmc-manuals.ru/manuals/i-miev/on ... 100ENG.HTM

This code is mostly for a situation where the EVECU is not getting the low voltage control signals thru the J_1772; but if the traces are blown at the connector of the EVECU, then no signal can get thru even with a good EVSSE unit, but that may be good for making a repair since the main EVECU functions were hopefully not impacted.

There are resistors either in the J_1772 handle or the chassis of the EVVSE to provide control signals, and if those were blown then this same code would occur. It was not a smart move for someone to connect AC directly to the control signals terminals (low voltage DC circuits).
kiev = kenny's innovative electric vehicle

laoczi2007
Posts: 9
Joined: Wed Nov 11, 2020 12:33 pm

Re: Gen2 OBC and DCDC pictures

Wed Nov 18, 2020 3:00 pm

kiev wrote:This is for troubleshooting the DTC P1B2A on a 2012, but may give you some ideas.

http://mmc-manuals.ru/manuals/i-miev/on ... 100ENG.HTM

This code is mostly for a situation where the EVECU is not getting the low voltage control signals thru the J_1772; but if the traces are blown at the connector of the EVECU, then no signal can get thru even with a good EVSSE unit, but that may be good for making a repair since the main EVECU functions were hopefully not impacted.

There are resistors either in the J_1772 handle or the chassis of the EVVSE to provide control signals, and if those were blown then this same code would occur. It was not a smart move for someone to connect AC directly to the control signals terminals (low voltage DC circuits).



This is exactly what I expect. I will check the circuit from the J1772 connector to the EV -ECU, and the EV¬ -ECU itself. The input circuits are uniquely destroyed. On the damaged car, when the ACC is turned on, on the signal pins J1772 0 volts, On my, the same serviceable car, on these pins 4.5 vac. When the ACC is off on a working car, the charge of the electrolytic capacitor is traced in the right signal contact G1772 with an ohmmeter. On the injured car, the ohmmeter reads infinity. Explicit open circuit. I assume that there is multiple destruction in the input signal circuit of the G1772.

It is unreasonable, this is a very mild word. I have never met more stupidity. This car – Mitsubishi Minicab MIEV a small business owner bought it specifically to save on fuel. Minicab came from Japan without a charging cable. The owner instructed his workers to charge it. They watched some kind of video on YouTube, and tried to charge ...

laoczi2007
Posts: 9
Joined: Wed Nov 11, 2020 12:33 pm

Re: Gen2 OBC and DCDC pictures

Sun Nov 22, 2020 12:24 am

Mitsubushi Minicab MIEV 2014 LTO 10,5 kW
I really need a schematic diagram or service manual for Mitsubishi IMIEV 2014.

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kiev
Posts: 1356
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Gen2 OBC and DCDC pictures

Sun Nov 22, 2020 6:19 am

Here's the bottom of the 9499B056 version from 2012. They use the same processor and other chips it seems but different board layout, and there are no reference designators on your board which makes it difficult to keep track of the circuits.

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If they used pins 3 and 4 of the J1772 for the AC, then this might be the shorting path that went thru the boards. The pin "103" seems to be right in the middle of the damaged area.

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kiev = kenny's innovative electric vehicle

laoczi2007
Posts: 9
Joined: Wed Nov 11, 2020 12:33 pm

Re: Gen2 OBC and DCDC pictures

Sun Nov 22, 2020 2:20 pm

kiev wrote:Here's the bottom of the 9499B056 version from 2012. They use the same processor and other chips it seems but different board layout, and there are no reference designators on your board which makes it difficult to keep track of the circuits.

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If they used pins 3 and 4 of the J1772 for the AC, then this might be the shorting path that went thru the boards. The pin "103" seems to be right in the middle of the damaged area.

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Thank you very much for your help!
I have already found a trace to the pins you specified on the connectors using a multimeter. Everything is as in your picture. From which I conclude that the wiring in 2014 is the same as in 2012.

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In the area of damage to the board, I found two resistors with a resistance of 5 and 8 megohms. One is labeled 301. As I understand it, 300 ohms. It's right? On the second resistor, the marking is destroyed by the arc. The tracks of the board have not been sold. Apparently they were saved by a layer of varnish. So far, I have not found any other damaged elements. Tomorrow I will solder a 300 ohm resistor and a 50 kilo ohm potentiometer instead of the one on which the marking is destroyed. I washed off the varnish with soot residues with alcohol. I could not detect a short circuit in the signal circuit J1772, which is written in the error code.

kiev
Posts: 1356
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Gen2 OBC and DCDC pictures

Sun Nov 22, 2020 3:54 pm

Yes if it is marked "301", that would be 300 Ohms. On my board the resistor toward the top is marked 331, 330 Ohms, and it connects to a 472 resistor to the output of either a dual diode or a transistor (3-terminal smd). It appears similar to what i see on your board.

i suspect that maybe the damage is internal to the board, in that the AC punched thru the top layer down to a ground plane. The same thing may have happened in the OBC. The current was trying to find a path and used the chassis ground and ground planes in the boards to complete the circuit. But if it jumped across a small capacitor then it could just be superficial damage. Good luck and hope it is minor damage that can be repaired.
kiev = kenny's innovative electric vehicle

coulomb
Posts: 237
Joined: Sun Jun 10, 2018 8:32 pm
Location: Brisbane, Australia

Re: Gen2 OBC and DCDC pictures

Sun Nov 22, 2020 4:57 pm

With AC on the control pins, the components that would bear the brunt of the current would be a 330Ω resistor, a 2.74 kΩ resistor, and a diode. Possibly also a 1.3 kΩ resistor. The diode can be any silicon diode; a 1N4004 equivalent would be fine and the 400 V rating would help prevent charging faults that are not uncommon with this diode. From the Wikipedia J1772 page:

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