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P1641 error and car not starting
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machsantos   
Sun Feb 25 2018, 09:34pm
Joined: Apr 17 2017
Member No: #3108
Location: Aveiro
 My C6 was working fine on my garage in a couple days ago. Suddenly it just turned off. Could not start it anymore so I checked for errors. Code P1641 appeared.
Also seems to me there is no fuel in the injector rails.

"P1641 -> Injectors control fault : Power stage / Injector residual voltage too large"

Any idea how to solve this one?
travlician   
Sun Feb 25 2018, 11:02pm
Joined: Jan 22 2011
Member No: #350
Location: Paradera
 Residual voltage too high implies no load on the injector voltage rail, maybe a loose injector connector?
machsantos   
Mon Feb 26 2018, 10:12am
Joined: Apr 17 2017
Member No: #3108
Location: Aveiro
 All tight... Also tought it was that but it wasn't.
Also tested all injectors with a multimeter. Black conector on ground, red into one of the two points of the injector cables. Should have 12V... have 1.5V.
After that I have tested between the two points of the injector cable connection. There should be no voltage but I get 1.59 V.
Really don't know what to do more.
MGmike   
Mon Feb 26 2018, 12:28pm
Joined: May 21 2017
Member No: #3151
Location: South Queensferry
 Checking the error code on an independent website and they come up with this as the error code description...

CITROEN: Fuel pump Primary circuit failure

Might be worth checking the fuel pump is doing it's stuff....
MGmike   
Mon Feb 26 2018, 12:37pm
Joined: May 21 2017
Member No: #3151
Location: South Queensferry
 Check F5 in the engine bay fuse box. This supplies the fuel volume and pressure regulators.
C6Dave   
Mon Feb 26 2018, 02:27pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
MGmike wrote ...

Might be worth checking the fuel pump is doing it's stuff....


Plus the obvious Fuel Filter itself especially this time of year as diesel tends to 'wax' and reduce the flow and pressure available.
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machsantos   
Mon Feb 26 2018, 05:14pm
Joined: Apr 17 2017
Member No: #3108
Location: Aveiro
 Haven't check the fuel filter! My bad!! Worth to check it.
I'll come later with good or bad news!
machsantos   
Thu Mar 01 2018, 03:09pm
Joined: Apr 17 2017
Member No: #3108
Location: Aveiro
 Hi guys!
So, fuel filter is OK, no wax or any strange stuff in there. Actually I've replaced it.
A more deep scan has been made and is showing "injector opening time = 0".
So injectors are not receiving order to open. That's not surprising because there is no pressure on the rails to injectors.
Probably, but just probably, ECU is malfunctioning or there is a problem with fuel pump solenoid (the one below the fuel pump). Haven't mesure yet the resistance of the damn thing!
Any toughts?
 

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