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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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CEM related issues: My diary of ongoing findings...Views : 19517 Replies : 72Users Viewing This Thread : |
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Dec 7th, 2020, 16:15 | #31 | |
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Quote:
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Dec 7th, 2020, 17:09 | #32 |
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Last Online: Jul 14th, 2021 10:39
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Location: IPSWICH
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I don't have any codes I can read, I'm just going by the messages on the dash, I'm convinced I only had the fan belt replaced this year, but can't find an invoice to confirm, if I have, it shouldn't be squealing again surely
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Dec 7th, 2020, 20:47 | #33 |
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no it shouldn't unless the alternator is charging too much and putting a heavy load on the belt .
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Dec 8th, 2020, 19:10 | #34 |
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Last Online: Aug 29th, 2023 23:29
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Location: Ryde
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I'd check the battery voltage with the engine off and with it running.
12.6v off 14.4v running. The alternators can catch fire, so it's worth checking. |
Dec 9th, 2020, 12:00 | #35 | |
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Last Online: Apr 11th, 2023 11:11
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Location: Carrickfergus
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Reading on battery when engine is off was 11.96V Reading when engine is on was 11.61V which should have been 14V Voltage coming out of the main terminal on alt should be 14v, if its not it could be your alt I replaced the alternator and it resolved the matter. Last edited by ThomasAO; Dec 9th, 2020 at 12:02. |
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Dec 11th, 2020, 10:02 | #36 |
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Last Online: Jul 14th, 2021 10:39
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Location: IPSWICH
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Soooooo, fanbelt replaced, they tested my battery and alternator, both are fine, apart from having to pop a shim on my positive battery post it is looking like we're back to the CEM
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Dec 13th, 2020, 22:45 | #37 |
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Last Online: Jul 14th, 2021 10:39
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Location: IPSWICH
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Bit of an update, it seems that I can drive for ages on a fast road with no issues, as soon as I'm in a 30 or 40 limit I have around 5 mins of driving till the "Power system service urgent" message appears. No issues with the way the car runs, I'm tempted to pop a multimeter on it to get a number for the voltage rather than rely on the garage telling me it's fine
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Dec 15th, 2020, 20:00 | #38 |
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Last Online: Mar 8th, 2024 20:19
Join Date: Jan 2014
Location: Sussex
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I had similar problems and went to Volvo Diagnostics. Made the car run a lot better https://volvodiagnostic.com/
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Jun 22nd, 2021, 13:39 | #39 | |
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Last Online: Jul 14th, 2021 10:39
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Finally got some numbers, I measured across the battery terminal clamps. Ignition off - 12.61 Running- 14.55 ( you suggested 14.4, is this overcharge or ok?) |
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Jun 22nd, 2021, 15:43 | #40 |
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Last Online: Today 16:01
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Location: L/H side
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yes that's all quite healthy , the charging voltage alters a little due to the temperature
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Tags |
s40 cem fault, v50 cem fault, volvo faulty cem |
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