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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Power system service warning light with no fault codeViews : 637 Replies : 4Users Viewing This Thread : |
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May 28th, 2020, 11:41 | #1 |
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Location: Northampton
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Power system service warning light with no fault code
What could cause the alternator to not charge and there to be a power system service warning light, but no fault codes in the ecu.
This is a 2005 v70 by the way. Initially there was an alternator code cem-dd30 (and I think cem-dd21). An alternator change fixed those, but not the dash warning. At that point it was charging at 13.5v but no more than that. It's now at a garage to investigate further and apparently has stopped charging at all (11.7v) but still no fault codes. They are saying it's the end of the road as it will be too expensive to fault find. Not sure if anyone else has already been down this road though... Wingers |
May 28th, 2020, 12:36 | #2 |
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From what I can find it appears it may just be a short or open circuit in the LIN wiring and there also appears to be a particular suspect. Read here: https://forums.swedespeed.com/showth...RVICE-REQUIRED
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May 28th, 2020, 13:19 | #3 |
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The lin system doesn't have any error codes either now though.
The garage have found a bit of corrosion in one of the cem connectors (not the alternator related one) but it's thought possible that the whole cem could be bad. That might be the next step but there aren't any other signs of issues with that so it seems unliukely for now. Wingers |
May 28th, 2020, 15:28 | #4 |
XC70 SE lux D5
Last Online: Feb 25th, 2024 14:34
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Location: Mansfield, notts
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So this may have already been checked but just in case.
2005 was the year that a lot of electrical changes took place , this includes the alternator. pre 2005 the alternator had a red/white wire going to the L terminal on the alternator and I believe it was just a straight 12V supply. post 2005 the alternator had a green/white wire going to the L terminal on the alternator and it now carried a signal rather than just a straight 12V. putting the wrong alternator on the car leads to no charging and probably a warning message. As 2005 was the change over year you need to check which colour wiring you have going to the L terminal on your alternator to be sure you fitted the right alternator. |
May 28th, 2020, 20:59 | #5 |
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As above, be sure you got the correct regulator https://www.youtube.com/watch?v=4KvF0Z1u7FE
See on Fcpeuro.com the right code Otherwise, a bad battery will no longer accept a charge. And of course, there may be a bad cable, even the small connector at the alternator can go bad
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