C5 diagnostic advice wanted

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coastline taxis
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C5 diagnostic advice wanted

Post by coastline taxis »

c5 2litre hdi 240k
Car runs perfect and just what ive come to expect from a c5 (thats why weve now got 10 of them). Any way got a daft niggle with this one once a week the car puts the light on and goes into limp mode so plug it in and get the following
" Micro dot power drop out"
Go to clear it and it says its permanent and cant be cleared so unplug the scanner and hey presto the light is of and full power back. so plug it straight back in and it now says no codes present and car runs fine for another week

Being doing diagnostics for a couple of years now so ive got a good grasp especialy with c5s but struggling with this one

Any ideas
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DickieG
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Post by DickieG »

Any code numbers with it? Have you looked in the C5 diagnostic manual?
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coastline taxis
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Post by coastline taxis »

no code numbers just says micro dot power drop out.

Using snap on a solus pro as the lexia not coming up with anything at all
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Post by wheeler »

Have you tried reading it with the scantool function in Lexia ?
If you have access to Lexia the 1st thing i would do is update the software in the injection ECU.
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Post by cachaciero »

This message presumably emanates from the Snap on tool of which I have no knowledge or experience. So what does it think it's looking at to come up with this message?.
I would assume that if not in the Snap on Manual then at least Snap On must have a list of all messages that the tool will display plus an indication of what it is looking at.

I wonder if it's just flagging a noisy / intermitent supply to the ECU?

Just a thought.

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