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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Engine Management LightViews : 889 Replies : 9Users Viewing This Thread : |
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Aug 22nd, 2019, 14:47 | #1 |
Steve
Last Online: Yesterday 17:05
Join Date: Jul 2012
Location: Bristol
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Engine Management Light
Hello my T5 has been off the road for about 7 years due to an MOT failure: Co high, Exhaust emissions carbon monoxide content at idle excessive. This was in 2012 when it was given to me as a spares vehicle. The tester said it was prob the Cat or a sensor. I made a code reader as described by Jod and got a read out soon after of 2 3 1 : Long term fuel mixture to rich or too weak. Due to my financial circumstances, time etc. I did nothing with the car, other than start it up occasionally & move it about my drive to keep the brakes free.
I've now decided to get it back on the road and apart from a few niggling things it seems to still run well & started first turn of the key, after about 6 months. However, the engine management light has now come on, the one that is an upside down Y in a green triangle on an orange background. I have run the codes using Jod's DIY reader and it come sup with 4 1 1. Which the manual says is Throttle position sensor signal outside voltage range.Is it likely that the sensor is defunct after being stood for so long? If so the Haynes module tells you how to remove it, but not what it looks like or its exact location. A photo or advice as to the problem would be much appreciated. |
Aug 22nd, 2019, 19:41 | #2 |
Master Member
Last Online: Apr 27th, 2024 14:56
Join Date: Jun 2018
Location: Presteigne, mid Wales
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I think that light may refer to an oxygen (lambda) sensor...
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Aug 22nd, 2019, 20:09 | #3 |
Premier Member
Last Online: Apr 26th, 2024 09:37
Join Date: Jan 2011
Location: Horne (Nr. Horley)
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No it doesn't, it's the engine management light, which comes on when ANY fault is found with the engine management system. What part of the system is faulty can only be determined by reading the codes (which the OP has done) which will usually point to the area where the fault lies. The lambda sensor is only one of many areas that may be faulty, and in this case lambda isn't indicated, but throttle position sensor is.
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Aug 23rd, 2019, 09:09 | #4 |
Master Member
Last Online: Apr 27th, 2024 14:56
Join Date: Jun 2018
Location: Presteigne, mid Wales
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https://www.google.com/imgres?imgurl...act=mrc&uact=8
OP says he has an upside down Y in a green triangle...Lambda sensor. Also says he has code 2 3 1 fuel mixture IMHO I would still consider replacing O2 sensor Last edited by volvo again; Aug 23rd, 2019 at 09:22. |
Aug 23rd, 2019, 10:18 | #5 |
Premier Member
Last Online: Sep 14th, 2022 17:04
Join Date: Jan 2018
Location: Derbyshire
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Sorry, but that light is a lambda light and not the EML. It is related to fuel system/emissions. The codes Steve has pulled are also pulled from the fuel system pin (A2).
Steve, your initial code of 231 is almost always a faulty vacuum line (I've had two in the 18 months I had my T5). You can either check them using a vacuum gauge or a smoke machine. Alternatively, given the car has been sitting a while and they're quite old now you can go through and systematically replace all the vacuum lines. O2 sensors do go, but they normally only die as a result of another underlying problem causing a too rich fuel mixture over a long period of time. I'd definitely be looking for an underlying cause first. Regarding 411, TPS is relatively easy to test. Here is one short guide on it, but there are plenty more out there. https://www.matthewsvolvosite.com/fo...ic.php?t=47868
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1995 Volvo 850 T5 Estate (Manual) |
Aug 31st, 2019, 12:10 | #6 |
Steve
Last Online: Yesterday 17:05
Join Date: Jul 2012
Location: Bristol
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Throttle Position Sensor.
Thanks for all of your input. I am still at a loss where to start with diagnosing the problem, though. I did take the TPS off and clean it using proper switch cleaner & clean the throttle with carb cleaner. While it was off I ran a test as shown on U Tube and it seems to read correctly ohm reading starting at around 1 & going up to about 2.3 (this is ok according to the video). But EML remained on, has it stayed on cos I have not cleared the code? However, the other video I found tested the TPS in position with engine running & the readings were from less than 1 upto about 4.5. Am I being thick?
I am tempted to swap the TPS from my other working 850 to see if this cures the prob. |
Sep 1st, 2019, 10:53 | #7 |
Ovlovnut
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You will need to clear the code(s) but I guess they will return if the problem is not fixed.
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