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Post by venom7000 on Aug 23, 2020 18:23:22 GMT
Is there a difference when I run a scan with engine off and engine on? Thanks  |
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Post by vwjap on Aug 23, 2020 18:36:11 GMT
Yes, I can’t remember what it does but I think there’s errors with it running
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Post by venom7000 on Aug 23, 2020 19:06:41 GMT
IDK if the offline (engine off) scan also scans things that have to do with the engine.
Im looking (expecting) a high pressure pump fault code.
But if it was truly faulty. Wouldn't it just record the fault and then show up on the off engine scan anyway?
I did get few fault codes once when I forgot to turn off engine before scan. Gave me DSG, handbrake and few other fault codes, that dont show up on the regular engine off scans. Thats why its confusing me.
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Post by dv52 (Australia) on Aug 23, 2020 22:30:39 GMT
venom7000: Hi.
When you use a diagnostic device to scan a car (regardless of who makes the device - VCDS, VCP, or OBD11), the process of invoking the scan function sends a message to the Gateway module to poll and return the values in a special part of each module's memory that is responsible for storing error messages. So for the purpose of scanning, it really doesn't matter if the engine is running, or if ignition only is switched-on.
Don
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pipa92
Junior Member
Posts: 73
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Post by pipa92 on Aug 24, 2020 7:28:41 GMT
Thank you for reply mate!
I was also wondering what is the procedure.
I just have a follow-up question then.
Why do I get dsg, engine or handbrake random errors while I scan with engine on? (While I scan with engine off they dont show up)
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Post by dv52 (Australia) on Aug 24, 2020 22:39:39 GMT
^^^pipa - I have no idea why that happens - what are the error messages?
don
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