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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 : 1656 Replies : 10Users Viewing This Thread : |
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Aug 2nd, 2021, 00:07 | #1 | |
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Aug 2nd, 2021, 00:41 | #2 | |
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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, 00:47 | #3 | |
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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, 08:40 | #4 |
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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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Aug 2nd, 2021, 14:08 | #5 |
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Here is the circuit diagram for a code reader and the overview of how to use it.
https://www.volvoclub.org.uk/faq/EngineOBDCodes.html https://youtu.be/odE9LoTQqwg Simple enough to make, but if you dont have time/a soldering iron then Loki makes them, as he said above. Cheers |
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