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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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OBD2 can't connect to ECUViews : 1565 Replies : 10Users Viewing This Thread : |
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Aug 1st, 2021, 23:02 | #1 |
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OBD2 can't connect to ECU
I have a 1997 940 Classic. I have the check engine light on and I got a a used cheap OBD2 reader (ANCEL AS200). I connected it to the car and I get an error saying it couldn't connect to the ECU.
Should I look for a unit with a specific protocol, or what? I was still at the sellers house, so I didn't buy the reader. But now I don't know if it's worth getting one from amazon either! |
Aug 1st, 2021, 23:11 | #2 |
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EOBD, the EU friendly OBDII standard, only became mandatory in the EU in 2001 for petrol cars, so yours will be some kind of older protocol, possibly 1 or 1.5. One of the RWD boys will be able to advise in more detail.
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Aug 1st, 2021, 23:37 | #3 | |
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Aug 1st, 2021, 23:54 | #4 |
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Aug 2nd, 2021, 00:57 | #5 |
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Pull fuse #1 (engine off) for 30 seconds or more then refit it.
Take it for a test drive and note when/if the EML comes back on. Mark is absolutely correct, it's a "not-quite-OBD" port on the 940s and will only work with a dedicated code reader - or a 12V LED (NOT a bulb! ) and a piece of wire but you need to know where to plug it in, which is the reset line etc - Lokis reader does the hard work bit of this in a conveniently fully built/tested package with an OBD plug on the end No, the mechanic can't read it with his stuff either.
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Aug 2nd, 2021, 01:07 | #6 | |
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Aug 2nd, 2021, 01:13 | #7 | |
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Aug 2nd, 2021, 01:41 | #8 | |
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For example, a blocked fuel filter can trigger a MAF code to be generated, as can running out of petrol because the ECU always assumes perfect conditions. It's not intelligent enough to realise the car is out of fuel and as a result there is no fuel to give the required engine speed increase the ECU has called for so it assumes the MAF isn't reading the increased airflow demands made by the EICV opening when the ECU tells it to. Just one example of a red herring!
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Aug 2nd, 2021, 01:47 | #9 | |
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Well, with that trick I will at least be able to pass inspection don't you think? That's my most pressing issue. |
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Aug 2nd, 2021, 09:40 | #10 |
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OBD-something Code reader
As other posters have noted, I do make a suitable code reader. I don't like to push them, preferring to let people who've bought them from me do the talking.
The 940 appears to use a Volvo-specific protocol rather than even OBD-I; I had an RAC patrol try, and fail, to read the Valdez's fault codes once, and he had a lap-top with OBD-I software installed.
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