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Old 29-09-14, 07:54 PM   #1
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Default How is particle filter additive level reported to ECU?

Hi all

Have a question about particle filter additive, I have a 407 and at 96,000 paid a local garage to fill the particle filter additive, this was before any warnings on dash were seen, to stop any problems with DPF. 2000 miles on I now have a warning 'particle filter additive level too low' . my question is how does the system know the particle filter additive level too low, is this by a ball-cock type gauge or is it set go off after a certain amount of miles (on a clock as such) as if it is on a ball-cock I will need ask the garage why. if not i guess i can get the clock reset.

Cheers

John
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Old 29-09-14, 08:51 PM   #2
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Additive counters need to be reset and maybe the ecu needs to be told how much additive was used when it is filled. Never having had a DPF I'm not certain how it works but I think it works out the level by knowing how much fluid is pumped into the tank each time and subtracts this amount from the total until it drops to a predefined level. When refilled and all the necessary info input via the correct diagnostic equipment it starts over. If I'm wrong then someone with more knowledge will correct me.

I'm guessing your local garage wasn't the Peugeot dealer and so haven't reset the counters or told the ecu that it has been refilled.
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Old 29-09-14, 09:22 PM   #3
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As above counters need reset, most systems have no level sensor, ECU calculates amount used from number of additive injections and based on stored qty value ECU then signals when it thinks it's empty.
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Old 30-09-14, 08:27 AM   #4
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https://www.peugeotforums.com/forums/...gnostic-28190/


https://www.peugeotforums.com/forums/...70/#post529130
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Old 30-09-14, 07:49 PM   #5
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Indeed, there is not level sensor in the tank. The amount of additive remaining is calculated by the ECU, since the fuel tank is dosed with a fixed amount every time the fuel cap is removed. Hence after re-filling the calculation must be reset.
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Old 04-04-16, 07:41 AM   #6
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Default Refill Additive? ECU says "Yes" Additive ECU says "No"

Apologies for a very late post but just in case anyone else faces the same issue I thought I'd update this thread with some additional facts about how the system works.

My 307 2.0HDI SW 2003 ECU is reporting 1 gramme of additive left (pp2000 PEF parameters).

The Additive ECU is reporting Minimum Level not reached

Previous posts explain that the ECU value is set at refill and re-calculated after each injection. So if a third party refills the Additive without updating the amount in the ECU the value held will be nonsense.

This worried me until I read the technical documentation which confirms that the Additive ECU DOES use a separate minimum level sensor in the additive tank (Phew!!).... This sensor tells the ECU to flash the minimum level message.

Not sure how I can correct the main ECU level but doesn't seem to be a problem.

Extract - all rights acknowledged.....
III - LOW ADDITIVE LEVEL SENSOR (1283)
A - ROLE
The sensor informs the additive ECU that the low additive level has been reached
when there is 0.3 litres remaining in the additive tank.
Depending on the information received, the additive ECU informs the fuel
injection ECU.
The injection ECU informs the BSI which requests activation of the following:
∑ request to flash the service LED on the control panel (*),
∑ request to display a message on the multifunction screen (*).
Note: 0.3 litres of additive is sufficient to fill up the tank 6 times with 80 litres
of fuel (*).
(*) depending on vehicle equipment.
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