Voltage on OBD2

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myfirstpicasso
Posts: 12
Joined: 15 Jun 2021, 22:26
Location: london
My Cars: Citroen Grand C4 Picasso 2.0 HDi 165 FAP Exclusive RHH 2011

Voltage on OBD2

Post by myfirstpicasso »

Hi guys,

just bought my first Citroen a 2011 Grand C4 Picasso 165 FAP .
I have an ELM327 app + FAP Citroen/Peugeot and I read a battery voltage of :

11.9 before ignition
10.5 during engine start
13.2 during normal drive
jumping to 14.2 for short periods of time

Is this a smart alternator ?
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Gregor
Posts: 101
Joined: 06 Jan 2021, 17:41
Location: Celje Slovenia
My Cars: Actual fleet:
- C5 III tourer 2.0 HDI RHF (103kW 2010)
- P208 XY 1.6 THP (115kW 2013)
- GSX-R 750 (110 kW 2008)

Past members:
Xsara 2.0 VTS (2001)
P206 1.4 XS (1999)
AX 1.1 (1991)
R 5 GT-turbo (1988)
Visa 11 RE (1984)
GS 1.3 Super (1979)
R 12 TL (1975)
Zastava 750 (1968)
x 14

Re: Voltage on OBD2

Post by Gregor »

Hi.

My C5X7 140 FAP is showing 14,1 to 14,4 when engine running. Could be your BAT is poor.

BR.
Gregor
Driving Citroen is a diagnose!
User avatar
Gregor
Posts: 101
Joined: 06 Jan 2021, 17:41
Location: Celje Slovenia
My Cars: Actual fleet:
- C5 III tourer 2.0 HDI RHF (103kW 2010)
- P208 XY 1.6 THP (115kW 2013)
- GSX-R 750 (110 kW 2008)

Past members:
Xsara 2.0 VTS (2001)
P206 1.4 XS (1999)
AX 1.1 (1991)
R 5 GT-turbo (1988)
Visa 11 RE (1984)
GS 1.3 Super (1979)
R 12 TL (1975)
Zastava 750 (1968)
x 14

Re: Voltage on OBD2

Post by Gregor »

Check the BAT connectors (on BAT and cables). If they are oxydized, clean them good.
Driving Citroen is a diagnose!
myfirstpicasso
Posts: 12
Joined: 15 Jun 2021, 22:26
Location: london
My Cars: Citroen Grand C4 Picasso 2.0 HDi 165 FAP Exclusive RHH 2011

Re: Voltage on OBD2

Post by myfirstpicasso »

Gregor wrote: 17 Jun 2021, 13:40 Hi.

My C5X7 140 FAP is showing 14,1 to 14,4 when engine running. Could be your BAT is poor.

BR.
Gregor
does you car have a smart alternator ?
User avatar
Gregor
Posts: 101
Joined: 06 Jan 2021, 17:41
Location: Celje Slovenia
My Cars: Actual fleet:
- C5 III tourer 2.0 HDI RHF (103kW 2010)
- P208 XY 1.6 THP (115kW 2013)
- GSX-R 750 (110 kW 2008)

Past members:
Xsara 2.0 VTS (2001)
P206 1.4 XS (1999)
AX 1.1 (1991)
R 5 GT-turbo (1988)
Visa 11 RE (1984)
GS 1.3 Super (1979)
R 12 TL (1975)
Zastava 750 (1968)
x 14

Re: Voltage on OBD2

Post by Gregor »

yes it does. I had to change accu. few weeks ago. Voltage didn't pass 12,8 V in driving and all sorts off erros came up in ECU. Since then voltage is 12.55V when not running and from 14,06 to 14,46V in driving. Lead accus need more than 14V to charge efficiently. As I said, you might have a voltage drop at connectors, but if your accu is more than 3 years old, ussualy says goodbye. Remember LED accus with less than 12V, when not "running" are considered damaged.

BR G
Driving Citroen is a diagnose!
User avatar
Gregor
Posts: 101
Joined: 06 Jan 2021, 17:41
Location: Celje Slovenia
My Cars: Actual fleet:
- C5 III tourer 2.0 HDI RHF (103kW 2010)
- P208 XY 1.6 THP (115kW 2013)
- GSX-R 750 (110 kW 2008)

Past members:
Xsara 2.0 VTS (2001)
P206 1.4 XS (1999)
AX 1.1 (1991)
R 5 GT-turbo (1988)
Visa 11 RE (1984)
GS 1.3 Super (1979)
R 12 TL (1975)
Zastava 750 (1968)
x 14

Re: Voltage on OBD2

Post by Gregor »

Lead not LED, sorry!
Driving Citroen is a diagnose!
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