VOLVO
ECM-121C - Mass air flow (MAF) sensor. Signal too high
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
5 modellerS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Vis modeller per årsmodell og motor (14)
- Volvo S60 (2001–2009)2005–2006Kun motor: B5204T5, B5244T4, B5244T5, B5254T2, B5254T4
- Volvo S60 (2001–2009)2007Kun motor: B5204T5, B5244T5, B5254T2, B5254T4
- Volvo S60 (2001–2009)2008–2009Kun motor: B5204T5, B5244T5, B5254T2
- Volvo S80 (1999–2006)2005–2006Kun motor: B5204T5, B5244T4, B5254T2, B6294S2, B6294T
- Volvo V70 (2000–2008)2005Kun motor: B5204T5, B5244T4, B5244T5, B5254T2, B5254T4
- Volvo V70 (2000–2008)2006–2007Kun motor: B5204T5, B5244T5, B5254T2, B5254T4
- Volvo V70 (2000–2008)2008Kun motor: B5254T2
- Volvo V70 XC / XC70 (2001–2007)2005Alle motorer unntatt: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Kun motor: B5244T4, B5254T2
- Volvo V70 XC / XC70 (2001–2007)2007Kun motor: B5254T2
- Volvo XC90 (2003–)2005–2006Kun motor: B5254T2, B6294T
- Volvo XC90 (2003–)2007–2012Kun motor: B5254T2
- Volvo XC90 (2003–)2013–2014Kun motor: B5254T9
- Volvo XC90 (2003–)2015
Hva betyr feilkoden?
The measured air mass from the mass air flow sensor is higher than the value the engine control module has calculated, and the code is set. The fault can lie in the wiring, where the signal wire may be shorted to supply voltage or the ground wire broken, or in the sensor itself.
Mulige årsaker
- Signal wire short-circuited to supply voltage
- Open circuit in the ground lead
- Damaged mass air flow sensor
Hva du kan gjøre
- 1Check the wiring to the mass air flow sensor for chafing and loose connectors
- 2Use a multimeter to check that the signal wire has no contact with supply voltage and that the ground wire is not broken
- 3With your own diagnostic tool, check that the air mass in live data rises smoothly when the throttle is pressed
- 4If the fault remains, have a workshop check the mass air flow sensor and its wiring
Symptomer du kan merke2
- The malfunction indicator lamp comes on
- The engine runs worse than normal
Hva feilen kan påvirke3
- Boost pressure is calculated instead of measured
- Rear oxygen sensor control is switched off
- Misfire detection is switched off
Generell veiledning for bileiere. Feilsøking på bilen kan peke på en annen årsak.