1998 volvo 940 lpt diagnostic codes

fondelli · Sep 10th, 2008, 10:00

I recently had my trusty 940 lpt estate converted to a multi point lpg conversion. I have an issue with the ECU warning light coming on about once a week. I want to get the fault code read so that I can sort the issue out. I took the car to an auto electrician who tried to interogate my ECU using a bosh vts system. When he tried to read the code it would not work. Is a dealer my only option? I've seen the code readers for sale on ebay, but I'm dubious that they will work. Anybody have any bright ideas? If I could buy a code reader at a good price I would do it.

davidwad · Sep 10th, 2008, 20:39

http://www.volvoforums.org.uk/showthread.php?t=57379

Have a look at the above link, which is a thread I started because I had a need to examine the diags on my N reg. 940 SE Turbo estate (boring bit: mine's a HP turbo apparently, but not sure why).

My attempts to find a reader failed, although there was one possibility left not fully explored, which I think might work if you can obtain an OBD2-USB lead and download the free software. However, if you read through my thread there was a link to instructions on how to read the codes without a reader, and I did it successfully using a Digital multimeter.

However (again), my surprise finding was that I can only interrogate codes with the engine running. This is not how it's meant to be, and I can only surmise that Volvo made changes during the period 1995-1998 which are not all well-known.

Good luck, and BTW I would love to know what LPG system you had fitted - I am considering it.

Best wishes

David Waddington

fondelli · Sep 11th, 2008, 10:10

Thanks for the reply. The LPG system I installed is a romano multipoint. In this day and age it's the way to go I reckon. I need to get this EML issue sorted and I think the gas ECU map still needs a bit of tweeking, but I'm still a convert.

fondelli · Sep 12th, 2008, 21:39

OK I built a little diagnostic unit from bits I bought at maplin. However, I must have done something wrong or the pin configuration on my car is different. Has anyone any bright ideas?

fondelli · Sep 15th, 2008, 11:52

Can anyone help me with this?

Sep 10th, 2008, 10:00	#1
fondelli New Member Last Online: Mar 23rd, 2013 18:42 Join Date: Jun 2006 Location: belfast	1998 volvo 940 lpt diagnostic codes I recently had my trusty 940 lpt estate converted to a multi point lpg conversion. I have an issue with the ECU warning light coming on about once a week. I want to get the fault code read so that I can sort the issue out. I took the car to an auto electrician who tried to interogate my ECU using a bosh vts system. When he tried to read the code it would not work. Is a dealer my only option? I've seen the code readers for sale on ebay, but I'm dubious that they will work. Anybody have any bright ideas? If I could buy a code reader at a good price I would do it.

Sep 10th, 2008, 20:39	#2
davidwad New Member Last Online: Apr 26th, 2009 21:02 Join Date: Jul 2008 Location: Pavenham	Hope this helps http://www.volvoforums.org.uk/showthread.php?t=57379 Have a look at the above link, which is a thread I started because I had a need to examine the diags on my N reg. 940 SE Turbo estate (boring bit: mine's a HP turbo apparently, but not sure why). My attempts to find a reader failed, although there was one possibility left not fully explored, which I think might work if you can obtain an OBD2-USB lead and download the free software. However, if you read through my thread there was a link to instructions on how to read the codes without a reader, and I did it successfully using a Digital multimeter. However (again), my surprise finding was that I can only interrogate codes with the engine running. This is not how it's meant to be, and I can only surmise that Volvo made changes during the period 1995-1998 which are not all well-known. Good luck, and BTW I would love to know what LPG system you had fitted - I am considering it. Best wishes David Waddington

Sep 11th, 2008, 10:10	#3
fondelli New Member Last Online: Mar 23rd, 2013 18:42 Join Date: Jun 2006 Location: belfast	Thanks for the reply. The LPG system I installed is a romano multipoint. In this day and age it's the way to go I reckon. I need to get this EML issue sorted and I think the gas ECU map still needs a bit of tweeking, but I'm still a convert.

Sep 12th, 2008, 21:39	#4
fondelli New Member Last Online: Mar 23rd, 2013 18:42 Join Date: Jun 2006 Location: belfast	OK I built a little diagnostic unit from bits I bought at maplin. However, I must have done something wrong or the pin configuration on my car is different. Has anyone any bright ideas?

Sep 15th, 2008, 11:52	#5
fondelli New Member Last Online: Mar 23rd, 2013 18:42 Join Date: Jun 2006 Location: belfast	Can anyone help me with this?

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