2012 Volvo Battery over changing

Ask for and share advice on using the PicoScope kit to fix vehicles here.
Post Reply
GNSMpico
Newbie
Posts: 1
Joined: Thu Nov 26, 2015 8:41 am

2012 Volvo Battery over changing

Post by GNSMpico »

Hello, new to the forums, only had the Pico scope a month.


I have a Volvo which is reading a charging voltage of 15.6v, the battery test on the picoscope says the battery is ok but needs charging.
On closer inspection of the battery the cells are bone dry, and there is clear evidence of foaming and over spill from the caps.
Id like to know whether the voltage regulator is located on the alternator as part of the unit or controlled buy a computer somewhere else.
also is the high charge rate normal for a modern car like this,(2012 Volvo V40 D2) the condition of the battery say to me that it isn't.

so the alternator could be at fault charging at such a high rate or if this is normal the battery is incorrect for this vehicle.

Any ideas would be appreciated.
Thanks GNSM

volrem
TwoWaves
TwoWaves
Posts: 243
Joined: Fri Jan 03, 2014 3:43 pm
Location: Estonia

Re: 2012 Volvo Battery over changing

Post by volrem »

Hi


Voltage regulator is inside alternator but voltage is controlled by control module via LIN connection. Charge voltage is calculated by battery voltage (calculated by outside temperature).

Remove the LIN wire connector from alternator and check voltage then. If voltage is still high then you have faulty alternator (voltage regulator).

Maximum allowed voltage is 15.0V at temperatures +10C to -30C. Check that you have correct temperature displayed in instrument panel. And voltage measurement is done in CEM (Central Electrical Module) so if there is voltage drop then regulation is incorrect.

With OE scanner you can do alternator test.

Wally
OneWave
OneWave
Posts: 18
Joined: Thu Jan 20, 2005 11:58 pm
Location: North Yorkshire Uk

Re: 2012 Volvo Battery over changing

Post by Wally »

Don't forget to check if it was the correct type of battery fitted. (and the one you replace it with is correct :D )

Wally

volrem
TwoWaves
TwoWaves
Posts: 243
Joined: Fri Jan 03, 2014 3:43 pm
Location: Estonia

Re: 2012 Volvo Battery over changing

Post by volrem »

And you need to reset with scanner after replacing battery.

Post Reply