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Thread: Z19DTH Flashing Glow Plug Light

  1. #1
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    Default Z19DTH Flashing Glow Plug Light

    Guys,
    My Vectra Estate did a regen today and was not interupted during it's cycle, but now my glow plug light has started flashing about 20km after the regen. Checked the saturation level and its 112% find that hard to believe after the amount of smoke that come out the exhaust today. No spanner light on or eml
    Guys need some help here other than having it removed.

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    Was type of driving were you doing when regen happened? Was it likely to get the exhaust temperatures up?

    You could try a can of JLM dpf cleaner in the fuel tank maybe which may help to clear the dpf but for the glow plug light to be flashing the ecu must think the regen failed or was ineffective for some reason.

    From TIS (only posted useful Q and A's)Question 2: The glow plug symbol is flashing. Why? What should be
    done?
    Answer: The DPF regeneration has not been completed during normal
    driving and has now reached its maximum saturation at which it can
    still be regenerated. The limit value depends on variant and MY, but
    is in the range of 105% - 125%.
    Possible causes for this are:
    a.) Frequent short distance journeys, i.e. high soot loading while at
    the same time regeneration of the DPF does not take place because
    the conditions necessary were not fulfilled.
    b.) Frequent interrupted regenerations, i.e. the engine was switched
    off during regeneration. Applies to short journey drivers who have
    at least fulfilled the conditions for triggering regeneration.
    If the glow plug light flashes, the vehicle should be driven
    until it goes out.
    Important: Regeneration is carried out more often (2 - 3 times) during
    the first 1000 km of driving in order to achieve a defined
    loading status of the DPF. This is necessary to reduce
    component and system tolerances, and forms the basis for
    precise calculation of the soot loading in the DPF.

    Question 3: What conditions are required for the DPF to begin

    regeneration?
    Answer: The following conditions must be fulfilled for regeneration to
    begin.
    a.) Engine running since start > 2 minutes.
    b.) Calculated saturation > 80%.
    c.) Coolant temperature > 70°C for at least 2 minutes.
    d.) No DPF-relevant faults stored in system.
    e.) A defined vehicle speed threshold must be exceeded in some cases
    (e.g. for 80%-100% loading, one time 100 km/h), at loadings above
    100% the speed does not matter.

    Question 5: Under what conditions is regeneration interrupted/ended
    once it has started?
    Answer: Normally when regeneration has been successfully completed,
    or:
    a.) After a maximum regeneration time (20 - 25 min.).
    b.) If the engine is switched off or has stalled.
    c.) If the engine is left idling for a long time (5 - 10 min.).
    d.) If 1000°C is detected by the exhaust temperature sensor.
    e.) If during regeneration, a fault is detected on the components
    relevant for combustion (injection/intake system).
    If a regeneration is interrupted once started but before it has been
    50% completed, the glow plug lamp flashes on the next engine start
    (cold or hot) and regeneration begins again once the operating
    conditions (see 3) have been fulfilled.

    Question 7: How long does complete regeneration take?
    a.) In the most favourable case?
    b.) In the least favourable case?
    Answer: a.) Under constant conditions, i.e. the exhaust temperature
    necessary for regeneration always lies above the required value, for
    example during motorway/cross-country driving, the average
    regeneration time is 10 minutes.
    b.) Vehicle conditions such as long down-hill descents, frequent
    driving in the low-load range (city driving, idling) allow the exhaust
    temperature to fall. If the conditions for triggering regeneration
    were fulfilled, the active regeneration time can be extended up to
    25 minutes (depending on engine type). If complete regeneration is
    not possible within this period, the regeneration will be interrupted.

    Question 9: Is the DPF sensor important for the regeneration
    procedure?
    Answer: The sensor does not initiate the regeneration, which is based
    on a model. The DPF sensor fulfils purely a diagnostic function to
    monitor the counter-pressure in the DPF.

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    Default

    Absolutly great post, very informative and thank you. It just so happens that I was in traffic just after it started to regen, thats when I noticed the instant consumption rise to 0.9g/h and beltch loads of smoke out when you revved the engine. It took around 20 minutes to complete the regen which is normal for my car, the bit I cannot understand is after 20 minutes of regen my saturation level is 112% is this to say then it was initially 125% ? Does 125% then put the car into limp mode?

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    Regular Member DAVIDD88's Avatar
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    Default

    Save up get it removed and mapped out there not worth the hastle

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    Regular Member Critch's Avatar
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    Vehicle : vauxhall vivaro

    Trim : Basic

    Engine : 1.9

    Year : 2004

    Default

    Take it for a drive on motorway keep revs over 3000rpm get exhaust hot should regen ok then

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    @wheelspin I have the flashing glow plug light and no matter what I've done to drive the car the recommended way to complete a regen all I get is loads of white smoke. Let me know how you get on!

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    Default

    Guys,
    Checked the front and rear differential pipes with compressed air and they are clear. What kind of KPA and voltage readings should I be getting when idling and driving?
    Micky86 will let you know what happens.

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    In that 20 mins in which the car was doing the regen, the exhaust temperature may not have reached 600 degrees in the DPF (due to the way in which the car was being driven) and so the fall in saturation may have been 0. Its really important that during a regen you get the revs up and get the engine load up (the ideal thing for dpf regen would be a hill climb for example).

    Even after a dealer does a forced regen the saturation is set to 80% so that shortly after the car will attempt another regen to get the saturation down further. This is because regen is much more effective when the car is driven (i.e. engine loaded) as opposed to being sat in a car park with a computer revving the nuts of your car.

    The DPF cleaners (fuel additives) contain catalysts that will help in both passive and active regeneration as they increase exhaust gas temperature during normal running. The ECU will see this more favourable exhaust gas temperature and take it into consideration when calculating/predicting DPF saturation level.

    The differential sensor is on a 5V reference circuit right? so around 0.5V would be totally clean and around 4.5V totally blocked however the value will be dependant upon engine rpm/load/egr. If you rev the engine and the voltage doesn't go up then one of the pressure lines has likely split or broken.

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    Quote Originally Posted by jonnyaykroyd View Post
    In that 20 mins in which the car was doing the regen, the exhaust temperature may not have reached 600 degrees in the DPF (due to the way in which the car was being driven) and so the fall in saturation may have been 0. Its really important that during a regen you get the revs up and get the engine load up (the ideal thing for dpf regen would be a hill climb for example).

    Even after a dealer does a forced regen the saturation is set to 80% so that shortly after the car will attempt another regen to get the saturation down further. This is because regen is much more effective when the car is driven (i.e. engine loaded) as opposed to being sat in a car park with a computer revving the nuts of your car.

    The DPF cleaners (fuel additives) contain catalysts that will help in both passive and active regeneration as they increase exhaust gas temperature during normal running. The ECU will see this more favourable exhaust gas temperature and take it into consideration when calculating/predicting DPF saturation level.

    The differential sensor is on a 5V reference circuit right? so around 0.5V would be totally clean and around 4.5V totally blocked however the value will be dependant upon engine rpm/load/egr. If you rev the engine and the voltage doesn't go up then one of the pressure lines has likely split or broken.
    Just looked back through some live data that I did a while ago and found that it was 98% saturated and the differential voltage is 0.61v with the engine speed at 1952rpm. I checked the pipes this morning and there is no blockage in them, could feel compressed air coming out of the back exhaust box. So does this mean that the differential pressure switch is faulty? There are no faults at all showing up when op-com is plugged in.

    Also on another note, the pre cat has no innerds if that makes a difference.
    Last edited by wheelspin; 6th March 2013 at 15:56.

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    Quote Originally Posted by wheelspin View Post
    Also on another note, the pre cat has no innerds if that makes a difference.
    Absolutely! Without the function of the precat (an exothermic reaction) you can not generate the heat in the exhaust gas required for successful regen.

    Correct functionality of the DPF relies heavily on post injection of fuel and the precat to use that post injected fuel to generate the heat.

    Basically all you're doing when the car tries to regen the dpf is pumping unburnt fuel into the DPF and saturating the soot that has already accumulated in the filter.

    How did your pre-cat come to have no innards?

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