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 Posted: Fri Jul 20, 2012 1:29 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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When a fault has been repaired (possibly)! Would the engine fault light automatically go off, or would it need clearing? Just changed my lambdas, but the anti-pollution message is still flashing up.
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Last edited by Steve206 on Thu Jul 26, 2012 3:16 pm; edited 1 time in total
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Posted: Fri Jul 20, 2012 1:34 pm |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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I think it needs to be cleared although I've read in a Peugeot document that it needs 3 cold-start running cycles
with no fault present to clear it itself and the EML go out.
Then it is just stored as a 'pending fault' for quite a while before dissapearing altogether.
Might not apply though..
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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Posted: Fri Jul 20, 2012 1:44 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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OK, ill give it the weekend, then take it to be cleared!
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Posted: Fri Jul 20, 2012 2:23 pm |
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Joined: Feb 07, 2010
Posts: 13077
Trade Rating: +65
Location: England
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You could try resetting the ECU to default settings, leave the battery off for 30 minutes.
Was the fault definitely the O2 sensors? A fault MAF/MAP can flick up a O2 sensor fault.
If you have replaced the faulty part it usually goes from a permanent fault to a saved/intermittent fault meaning the EML wouldn't be on.
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Posted: Fri Jul 20, 2012 2:52 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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How long would after replacing part would it take for the light to go out?
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Posted: Fri Jul 20, 2012 2:57 pm |
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Joined: Feb 07, 2010
Posts: 13077
Trade Rating: +65
Location: England
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Usually straight away or at least after a drive, when the ECU adapts
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Posted: Sat Jul 21, 2012 4:58 am |
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Joined: Feb 10, 2010
Posts: 4266
Trade Rating: +4
Location: Palestine
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Get it cleared from the ECU memo ,that is much better to make sure you got the problem fixed for good.
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Posted: Thu Jul 26, 2012 3:20 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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Thanks for the info so far.
I've got a hold of PP2000 which i ran over the car tonight. Came back with 2 faults
P0131 Upstream Oxygen Sensor, Short to Earth or Open Circuit (intermittent)
P0170 Forget what it says!
Ive already changed the Lambda sensor for one i new was working, was last time had it on car anyway. This leads me to think its a wiring problem. Ill check the harness with a multimeter and see what results i get with that. I think there's a problem with the wiring.
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Posted: Thu Jul 26, 2012 3:23 pm |
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Joined: Feb 07, 2010
Posts: 13077
Trade Rating: +65
Location: England
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Checked the MAF?
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Posted: Thu Jul 26, 2012 3:41 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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Mines a 2004 Gti, so has a MAP, looked clean though, any way to check? Ive read i should look for leaking in the intake.
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Posted: Thu Jul 26, 2012 4:01 pm |
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Joined: Feb 07, 2010
Posts: 13077
Trade Rating: +65
Location: England
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To check signal. Pins 1 and 2 should be 1.3v when idling; then 4.7v briefly when you rev
D/C the MAP and pins 3 and the earth should read 5v with ignition on
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Posted: Thu Jul 26, 2012 4:06 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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| Lee wrote: |
To check signal. Pins 1 and 2 should be 1.3v when idling; then 4.7v briefly when you rev
D/C the MAP and pins 3 and the earth should read 5v with ignition on |
THanks for that info, have been googling it. I think code p0170 was for an open circuit, so will see if the lambda or wiring is duff. I also looked up my fault history, can you check what they were for? I can get the dates, no more info though
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Posted: Fri Jul 27, 2012 1:33 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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Some fault codes will be erased if you replace a component and others won't
MAP sensor circuit fault on petrol engines is one of the fault codes that will stay stored and the MAP will be flagged as bad and ignored from that point on. The car has no idea if you put a new sensor in that it is now a different sensor as it has no way of knowing so it will continue to be ignored. So that's one where the fault code needs to be erased and a relearn process of the MAP and other parameters made
With others like O2 sensor then it will eventually adjust to a new sensor but it's still best to reset and let it relearn from scratch. Any major component change to do with engine running would be better with a reset and relearn
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Posted: Mon Jul 30, 2012 1:10 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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I think the p0170 code leads me too the MAP sensor fault. Too much fuelling leading to a range outside the lambda range. My MAP sensor looked oily? Still need to test it.
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Posted: Tue Jul 31, 2012 4:26 pm |
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Joined: Feb 07, 2010
Posts: 2718
Trade Rating: +6
Location: UK
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Lee, the voltage change on pins 1 & 2 is that for the lambda or map?
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