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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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Problems reading fault codes with readerViews : 1023 Replies : 28Users Viewing This Thread : |
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Jun 29th, 2020, 13:52 | #21 |
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So I've spent hours, literally hours trawling the internet, watching videos and reading forums and blogs and I'm at a bit of a loss now.
I've ordered myself a little switch in a rather desperate attempt to see if that makes any different to my little homemade reader. I know it shouldn't, but at this point I will try anything. A few questions that would be great to get absolute clarity around, if anyone can chime in and provide knowledge... 1. Is the only way to read the faults on my 96 car via a homemade reader or is there a product I can buy? Mr Luxobarge has kindly offered to plug his reader in but if what I have learned it correct, then an OBDII reader will not work with my car anyway because despite having the port its a big fat porkie pie and doesn't actually have one. 2. If I buy a new lambda sensor and fit it, and assuming that was the reason the warning was on (I know in reality it could be one of a number of things but for this question let us assume it is), would the new item instantly clear the warning light or would it take a while? I am aware that the fault codes stored would not go away. 3. Is there a chance a local garage might be able to figure out how to pinpoint the issue with the car? 4. Having tried many, many things to get my reader to work, I am now of the belief that either the wire attached to port 3 of the plug that goes to the ECU is broken somewhere or that the ECU itself has had some sort of wobbly and is refusing any longer to spit out any codes. I have tried to figure out how I would test the former here, i.e. for sure text of the port 3 wire is connected properly but I don't know how to do this. Any suggestions? For some extra info, the car seems to be running just fine. The idle does not hunt, it is fairly high (just over 1k) on cold start then after a while (maybe 5 or so mins at idle or a few miles driving) it settles to a low rev (counter suggest almost zero which I don't think can be right). Other than that it seems to drive fine engine-wise. Thank you
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Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate |
Jun 29th, 2020, 15:11 | #22 |
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VOL-FCR is the diagnostics required for the 850, plus a laptop running Windows XP and a lead to go from the laptop to the OBD port
I've no idea how good it is but someone here will most likely chime in More info on VOL-FCR here CLICK
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MY2010 XC90 SE (M66-manual) Magic Blue (467) Sold MY1997 850 GLT (62,000 miles) Silver Sand (419) MY2005 V70 2.5T (66,000 miles) Willow Green (471) Volvo 850 GLT website |
Jun 29th, 2020, 16:38 | #23 |
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If you have a dodgy rev counter, maybe that’s another symptom of the same issue?? Just a stab in the dark... If yours is showing near zero at idle then there’s obviously an issue somewhere...
For what it’s worth, I had a quick look at the wiring diagrams, and the wiring from pin 3 of the OBD connector seems to pass through the immobiliser on its way to the ECU, which may or may not be relevant here, but I thought it was interesting... You could try checking for continuity along the wires with a multimeter, other than that I’m not sure what to suggest... A competent auto-electrician may be your best bet? |
Jun 29th, 2020, 16:41 | #24 | |
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Thanks Mr 4x4. If I understand what they say however, I am not sure it can help me.
Quote:
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Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate |
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Jun 29th, 2020, 16:46 | #25 |
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Last Online: Mar 18th, 2024 16:39
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Yes I came across a wiring diagram that suggested that the wire goes via the immobiliser too, at least in Europe anyway. So yeah maybe there's something in that. I have no idea if the immobiliser is working or not. Maybe I need to get into the ECU and check there but to be honest I have no idea what I'm looking at, I'm a long way from an auto-electrician in terms of skill!
I've only driven the car twice since buying but I did notice that about the rev counter. Maybe I'll take it out again and keep a closer eye. I think you might be right though, a decent auto electrician might be the next step. Only problem is...who?!
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Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate |
Jun 29th, 2020, 17:06 | #26 |
I roll
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MY2010 XC90 SE (M66-manual) Magic Blue (467) Sold MY1997 850 GLT (62,000 miles) Silver Sand (419) MY2005 V70 2.5T (66,000 miles) Willow Green (471) Volvo 850 GLT website |
Jun 30th, 2020, 23:32 | #27 |
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Last Online: Feb 12th, 2024 22:22
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Rai
If I have read correctly and Luxo has offered the use of his VOL FCR you would be a fool to refuse, also available in East London in the unlikely event you are passing |
The Following User Says Thank You to Bigfella666 For This Useful Post: |
Jul 1st, 2020, 00:21 | #28 | |
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Quote:
But please if I’ve got the wrong end of the stick here correct me and explain it to me, this is all new to me.
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Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate |
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Jul 1st, 2020, 09:30 | #29 |
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Noooo, I don't have VOL FCR, I just have a generic OBDII scanner (Autel MS501) which works fine on my '97 V70 but I fear won't work on a '96 10-valve 850, surely someone on here can confirm this?
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