Hi,
I've been wondering about this for some time and having tried various googles haven't come up with an answer.
When my C5 (engine code DW10ATED) had it's diagnostic codes read it came up with a coolant sensor fault. I think it was 'P1116 Engine Coolant sensor out of range'. So my question is this, why is this fault showing if the temperature gauge on the dash seemingly works OK, are there different sensors for the gauge and the ECU? The only sensor I'm aware of is the one on the side of the head below the intake butterfly. I'd take it in to be looked at but money's tight at the moment.
Thanks in anticipation.
Steve.
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Steve
It's all networked from the coolant sensor; if that was indeed the code, maybe it was only a blip - did you clear it and check if it recurred?
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Hi,
Ah I see. Yes the fault was cleared but reappeared withing minutes. I suppose changing the sensor is pointless, it sounds as if I need to save up for specialist (Bosch dealer) to have a look.
Thanks.
Steve.
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The sensor may be breaking the circuit momentarily - too fast for the damped gauge to detect, but long enough for the ECU to notice.
I'd normally stick a scope on it and record/watch it's signal; but, in this case, changing the sensor might be cheaper than a diagnostic.
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Thanks I'll do that and see if it makes any difference.
Steve.
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Hi Screwloose,
I managed to borrow a Lexia and laptop to read the codes and it found none so I think that cleaning the contacts on the ECT sensor must have worked. If I gave you a link to some screen shots would it be possible for you to have a look and tell me if it looks normal please?
Thanks.
Steve.
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If the code hasn't returned and everything is working normally, then I'd agree that the most likely cause of the problem was the sensor connexions.
By all means post up some data.
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Hi Screwloose,
Did you get a chance to have a look?
Thanks.
Steve.
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After having a quick look - is injector three and four ok?
The fuel trims are high and low for it - and the reported voltage on that bank is lower? Stuck injector or something maybe?
(ref - picture 3)
James
Edited by Javalin on 28/11/2008 at 13:40
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Sorry - that should read:
>The fuel trims are high and low for it - and the reported voltage on that bank is lower? Stuck injector or something maybe?
-> The fuel trims are high and low for it - and the reported voltage on the banks are different? Stuck injector, weak or dribbling, or something maybe?
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Don't know, it's way above my head but there is a difference between the voltages and negative correction factor on injector 3 but is it significant?
Thanks for your input.
Steve.
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Steve
Sorry; the site was messing about again yesterday and I couldn't risk leaving this page open and frying my chip again; so it slipped through the cracks.
After having a good look; the coolant sensor seems plausible - if it had been left to cool for a couple of hours.
The only odd thing are the smooth-running correction figures. Injector 3 seems to be well out of line - the total permissible correction is 5%. The injector driver voltages are further apart than usual too.
Not something to immediately worry about; but slightly odd nevertheless.
Edited by Screwloose on 28/11/2008 at 13:51
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Hi Screwloose,
Thanks for the expert opinion. I'll keep an eye on things to see if anything changes - engine note, misfires, etc.
Steve.
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