Troubleshooting and repair for On-board Charger (OBC)

[coulomb]

I suppose the differences might be due to the inaccuracy of my cheap multi-meter.

It could well be that, and/or temperature, different parts, and so on. I'd say the Waffle Plate™ is probably OK from that.

[Carlossalinas]

My iMiev starting charging and after few seconds stops and silient :/

Did you check that 230 VAC arrives inside OBC for at least few seconds after pluging Yazaki charging connector? (Charger and charging power-path is OK)

I see 14.5V and above 400V on high voltage side.

Strange. Old-type batteries have 88 cells x 4,10V = 360,8V, the newer ones have 80 cells x 4,10V = 328V

[treisutedoi302]

hello!

i have the same problem as few post ago. i have a 2011 i miev that doesn't slow charge. only chademo fast charge. i changed the 4.7 ohm 5w resistor and the problem was solved for 2 days. now, that resistor is broken again and if i change it is broken immediately. a little help, please?

[Slava]

Hello everyone from sunny Finland )
I'm asking for help because I'm stuck.
Citroen c-zero does not go into ready mode, the 12 V battery charging lamp and the low brake fluid level lamp are on.
no 12v battery charger.
the OBC unit does not communicate with the diagnostic equipment.
checked the OBC power according to the instructions:
http://mmc-manuals.ru/manuals/i-miev/on ... 101ENG.HTM - everything is ok
all relays are ok.
fuse MSU ok
opened OBC: all fuses on the top and bottom board - ok
there are no damages.
I wanted to add a photo, but did not understand how to do it:((
any ideas where to go next?
kind regards

[kiev]

hello!

i have the same problem as few post ago. i have a 2011 i miev that doesn't slow charge. only chademo fast charge. i changed the 4.7 ohm 5w resistor and the problem was solved for 2 days. now, that resistor is broken again and if i change it is broken immediately. a little help, please?

Howdy and welcome t302, it sounds like your AC relay is not engaging and the resistor is being forced to carry the AC input power for too long a period (which it was never designed or intended to do).

The white ceramic resistors are pre-charge resistors to handle the initial inrush current into the large capacitors on the power board. After a brief time period the AC relay is supposed to engage and bypass the resistors and carry the bulk of the AC input to the waffle plate under the power board.

See posts on page 1 for pictures and links to other posts such as how to test the AC relay, etc. The relay may be defective or the 5V supply voltage created on the upper control board may be missing or some other fault is preventing the 5V from reaching/switching the relay coil.

One of the white ceramic resistors has an internal thermal fuse, the other one is purely a resistor, check them both, but do not energize the OBC until you have cleared the AC relay issue or the resistors will continue to fail.

[kiev]

Hello everyone from sunny Finland :))
I'm asking for help because I'm stuck.
Citroen c-zero does not go into ready mode, the 12 V battery charging lamp and the low brake fluid level lamp are on.
no 12v battery charger.
the OBC unit does not communicate with the diagnostic equipment.
checked the OBC power according to the instructions:
http://mmc-manuals.ru/manuals/i-miev/on ... 101ENG.HTM - everything is ok
all relays are ok.
fuse MSU ok
opened OBC: all fuses on the top and bottom board - ok
there are no damages.
I wanted to add a photo, but did not understand how to do it:((
any ideas where to go next?
kind regards

Howdy Slava from Finland,

Here are a few ideas for you.

What is the age and condition of your 12V starter battery? A weak, old or worn out 12V battery can cause a multitude of faults and issues with an EV. It might read normal with no load but sag too low when the loads are applied.

The other idea is that the fuse in the Motor Control Unit (MCU) has blown. This would cause the faults you have described, i.e. lack of READY, lack of 12V charging, lack of OBC charging operation.

Do you hear the usual relays and contactors in the pack clacking when you try to start the car or when plugging in the EVSE handle to charge the car?

If possible get an OBDII scan tool or dongle to read out the DTCs to help identify the troubleshooting path.

[Slava]

thanks for the response.
the car came to me with a completely empty 12v battery.
I connected another one along with charging to do diagnostics
at the first error reading, the ECM_EV block issued the following codes:
P1B31 - brake fluid pressure sensor fault
U1113 - DTC to be ignored
P1A15 - Capasitor charging fault Charging time too long
after removing the errors, only U1113 remained.





at the same time, in the live data I see 4.44 V Traction battery OBC signal voltage and the OBC unit does not get any response - not connected.
Today I will remove and completely disassemble the converter.

[Slava]

Hello everyone from sunny Finland )
I'm asking for help because I'm stuck.
Citroen c-zero does not go into ready mode, the 12 V battery charging lamp and the low brake fluid level lamp are on.
no 12v battery charger.
the OBC unit does not communicate with the diagnostic equipment.
checked the OBC power according to the instructions:
http://mmc-manuals.ru/manuals/i-miev/on ... 101ENG.HTM - everything is ok
all relays are ok.
fuse MSU ok
opened OBC: all fuses on the top and bottom board - ok
there are no damages.
I wanted to add a photo, but did not understand how to do it:((
any ideas where to go next?
kind regards

Howdy Slava from Finland,

Here are a few ideas for you.

What is the age and condition of your 12V starter battery? A weak, old or worn out 12V battery can cause a multitude of faults and issues with an EV. It might read normal with no load but sag too low when the loads are applied.

The other idea is that the fuse in the Motor Control Unit (MCU) has blown. This would cause the faults you have described, i.e. lack of READY, lack of 12V charging, lack of OBC charging operation.

Do you hear the usual relays and contactors in the pack clacking when you try to start the car or when plugging in the EVSE handle to charge the car?

If possible get an OBDII scan tool or dongle to read out the DTCs to help identify the troubleshooting path.

when the key is turned, there is no click of the relay, only the sound system fades out

[Slava]

removed the converter, opened the bottom cover.
no visible damage. fuses are all ok.
direct wire to 12v battery is ok.
MCU fuse that located under smal lid on invertor - ok


any idea?

[Slava]

I continued my research:
checked the transistors under the bottom lid - it's ok.
I checked Can - the signal is good.

then I noticed a pattern:
when I connect everything - there are three errors and a yellow service lamp.
P1B31 - brake fluid pressure sensor fault
U1113 - DTC to be ignored
P1A15 - Capasitor charging fault Charging time too long
after deleting errors, the yellow lamp goes out, I try to transfer the car to Ready, I HEAR THE RELAY, but the yellow lamp lights up again and the ready mode is unreachable.
I read the codes and see again
P1A15 - Capasitor charging fault Charging time too long
Is it a problem with the inverter? but the diagnostics of errors on it does not give out, and I don’t understand why the OBC unit does not get in connection with diagnostic ???