C4 II DPF wiring diagram

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maridias
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Joined: 10 Feb 2021, 03:03

C4 II DPF wiring diagram

Post by maridias »

Hello,

i have an issue with warnings from DPF and the eolys pump.

i tried to replace/refuel(eolys) and reset the counters but it said that have no communication(old deposit and also with new deposit). So i guess there is some broken wire or fuse that is blocking communication. Tried to find some wiring diagrams but couldnt. do you have or could you guide me?

Regards
Duarte

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GiveMeABreak
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Re: C4 II DPF wiring diagram

Post by GiveMeABreak »

It needs diagnosing - playing about with wires won't help. The additive system on these is controlled by the injection ECU on a C4 (B7). Can you please explain what you mean by "old deposit and also with new deposit"? I don't understand this. There is no separate additive ECU, so if you cannot communicate with your engine ECU then I would say you have other problems - or your diagnostic tool is not a full chip CAN version.

maridias
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Joined: 10 Feb 2021, 03:03

Re: C4 II DPF wiring diagram

Post by maridias »

Hi Marc,

Thanks for your fast reply.

when i said there is a communication error i mean that i get the error when i am trying to reset the values after replacing eolys(powerflex in this case). All other functions and readings are ok. That is why i suspect some broken wire or something from the eolys unit(that as replaced) itself to the injection ECU.

Many thanks in advace

maridias
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Joined: 10 Feb 2021, 03:03

Re: C4 II DPF wiring diagram

Post by maridias »

and sorry, when i said "deposit" i was referring to eolys tank

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GiveMeABreak
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Re: C4 II DPF wiring diagram

Post by GiveMeABreak »

Ok, so what version of Diagbox are you using? Sometimes there are issues with the software version. Sometimes it is better to try an older version to sort this out.

Just to check - you have done a Global Test, then gone into the injection ECU and looked for the repair / Reset additive options? They can be in several places - so make sure you have tried them all. Also make sure your car battery is fully charged as the car can go into economy mode.

But if all else fails pop up your VIN and I'll see if I have the circuit Diagram you need - but no guarantees.

maridias
Posts: 6
Joined: 10 Feb 2021, 03:03

Re: C4 II DPF wiring diagram

Post by maridias »

Hi again Marc,

yes i tried to reset it like that. also battery is ok.

VIN number is VF7**************[VIN obfuscated, can be read by forum staff]

If you find the diagram it would be great :)

Thanks
Last edited by maridias on 10 Feb 2021, 16:11, edited 1 time in total.

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myglaren
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Re: C4 II DPF wiring diagram

Post by myglaren »

maridias wrote:
10 Feb 2021, 16:04
Hi again Marc,

yes i tried to reset it like that. also battery is ok.

VIN number is

If you find the diagram it would be great :)

Thanks
There is a character or digit missing from the VIN.

maridias
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Re: C4 II DPF wiring diagram

Post by maridias »

Sorry, 7 was missing.

here it goes:

VF7**************[VIN obfuscated, can be read by forum staff]

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GiveMeABreak
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Re: C4 II DPF wiring diagram

Post by GiveMeABreak »

Ok, you're in luck, here you go:

1283: fuel additive pump
1320: engine ECU /
1344: upstream exhaust gas high temperature sensor /
1341: particle filter differential pressure sensor /

Main Diagram
Image


Detail
Image


Wiring Location
Image

maridias
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Joined: 10 Feb 2021, 03:03

Re: C4 II DPF wiring diagram

Post by maridias »

Thanks Marc.

Since reading is OK but only the programming gives "no communication" do you think it could be some wire between injection ECU and BSM or BSI or something?

Thanks

Best Regards
Mário

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GiveMeABreak
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Re: C4 II DPF wiring diagram

Post by GiveMeABreak »

Hi Mário

Not from experience here - that issue usually indicates a diagnostic interface / tool problem to me. I've seen it before where either some of the VCI clones or the software versions just won't reset it. It's usually a trip to the dealer to do to get it reset if this happens.