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Bad coolant temp sender or bad ECU? S80 2001

posted by  KlausC on  Sat Dec 6 13:07 CST 2014
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last visit: Fri Oct 24 10:15 CST 2014
[RELATED]

ALL of the communications goes through the CEM. The only way to isolate the CEM as a problem is to do a computer scan, via scan tool. Besides, that is an expensive part to throw at a problem as a guess. A new CEM is too costly to replace and will probably fail in 10 years or less, Xemodex is a better alternative.

The DIM is known for failure, but it will not effect engine performance.

The speed signal goes through the ABS and that effects a lot of engine driven parameters + the odo and speedometer.

A lean/rich fuel mix can also be caused by a vacuum leak, degradded MAF, or even throttle control/TPS.

When you get the codes read, write them all down. And have them check the seat computers and clear any messages stored there while they are at it.
--
My back feels better when I sit in a Volvo seat






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