Master III Charging fault

**JBoza** · 27th January, 2019, 12:41 PM

Hello mates! Stuck on a master 2014 charging fault on dash coming up, alternator change 2 times, check all cables try change upc module on second hand still have fold , upc module see 7.5v when car running , and 3.5v when ignition on. Check all harness on upc module not in one cabel don`t have 7.5v when car running.. wtf ?

**autoden** · 27th January, 2019, 06:56 PM

What if you go direct to alternator, what volts?

**Meat-Head** · 28th January, 2019, 12:10 AM

Err guess DIGITAL SIGNAL from alternator from engine ecu or aftermarket altmator wrong

check intelligent battery terminal

**JBoza** · 28th January, 2019, 08:29 AM

from alternator when car running coming 14.5v

**JBoza** · 28th January, 2019, 11:49 AM

Originally Posted by Meat-Head

Err guess DIGITAL SIGNAL from alternator from engine ecu or aftermarket altmator wrong

check intelligent battery terminal

where is this terminal ?

**Meat-Head** · 28th January, 2019, 02:37 PM

On battery negative I think clean all connections on battery

**zubereq** · 28th January, 2019, 06:06 PM

I had similar problem in laguna 2010. If you have intelligent positive battery terminal check small red wire. I had broken wire inside insulation.

**JBoza** · 29th January, 2019, 07:25 AM

there is no battery intelligent sensor... it`s i think inside in upc module.. but i have change them..

**Meat-Head** · 29th January, 2019, 08:46 AM

So sounds like comes from engine ecu and high reistancse What does diagnostic computer say?

**JBoza** · 29th January, 2019, 09:45 AM

i have check with can clip on engine ecu no any fold about charging only upc module see low voltage ..

**JBoza** · 29th January, 2019, 01:37 PM

nothing.. still same.. after 20sec coming up message low battery..

**Louislesinge** · 29th January, 2019, 03:14 PM

Hi,
Once i saw this problem on the same car. I don't remember exactly which one it was but it was because of a supply on the UPC. So check specially all red wires and grounds of the UPC.
If you need wiring diagram of UPC send VIN please.
Greetings,

Add: I mean the problem is not because UPC feels generator is not working, it is because one of the power supply is low, so you must connect voltmeter to see where the problem is.

**mihac** · 30th January, 2019, 04:44 PM

Measure really power supply on UPC, example use multimeter or oscilloscope.

**JBoza** · 31st January, 2019, 11:36 AM

i have check all power supply from battery and ground i have wiring diagram.. thanks mates! but car have a bad history.. owners try boost this car with 24v .. So i was burn bcm , engine ecu, upc... i use second hand movano bcm and move just eeprom then i find communication with bcm then open engine ecu it`s was complitly burn.. so i take also engine ecu from movano do virgin a send car to dealer. They say to me sorry but you have to buy a new ecu from us then we can coding them.. I get car back and use can emulator and do immo off.. then car starting but alternator lamp coming up.. Now i got same car at garage and look all volume with can clip it`s all same ass on working cars.. but can to upc diferent.. so i think my emulator on engine ecu do wrong signal to upc...