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MAF and LTFT poor fuel mileage V70-XC70

posted by  Rolyak on  Sun Mar 27 19:28 CST 2022
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last visit: Fri Oct 24 08:03 CST 2014
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Tonight I spent some time with the ES 610 Autphix as I was concerned that MPG would not improve with warmer weather, driving normally I had been observing 21-23 MPG.

The scanner revealed ECM-216C failed LTFT and ECM-121B failed MAF, tried a couple used MAF's with no change in codes. Both were cleaned.

Ran engine with terminal disconnected and through CEL for a bad MAF. O2 sensor one was replaced and reads in milliamp's assuming that is correct as ES610 did not show V. under Volvo diagnostics.

LTFT had indicated 7.8% and MAF at 3.9 g/s STFT ranged from .00-.08-3.9-5.5% disconnecting MAF revealed .000 g/s

New unit was ordered and hoping there is no wiring issues!?







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