VOLVO
ECM-121D - Mass air flow (MAF) sensor. Signal too low
System
Motorsteuergerät (ECM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
5 ModelleS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Modelle nach Baujahr und Motor anzeigen (14)
- Volvo S60 (2001–2009)2005–2006Nur Motor: B5204T5, B5244T4, B5244T5, B5254T2, B5254T4
- Volvo S60 (2001–2009)2007Nur Motor: B5204T5, B5244T5, B5254T2, B5254T4
- Volvo S60 (2001–2009)2008–2009Nur Motor: B5204T5, B5244T5, B5254T2
- Volvo S80 (1999–2006)2005–2006Nur Motor: B5204T5, B5244T4, B5254T2, B6294S2, B6294T
- Volvo V70 (2000–2008)2005Nur Motor: B5204T5, B5244T4, B5244T5, B5254T2, B5254T4
- Volvo V70 (2000–2008)2006–2007Nur Motor: B5204T5, B5244T5, B5254T2, B5254T4
- Volvo V70 (2000–2008)2008Nur Motor: B5254T2
- Volvo V70 XC / XC70 (2001–2007)2005Alle Motoren außer: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Nur Motor: B5244T4, B5254T2
- Volvo V70 XC / XC70 (2001–2007)2007Nur Motor: B5254T2
- Volvo XC90 (2003–)2005–2006Nur Motor: B5254T2, B6294T
- Volvo XC90 (2003–)2007–2012Nur Motor: B5254T2
- Volvo XC90 (2003–)2013–2014Nur Motor: B5254T9
- Volvo XC90 (2003–)2015
Was bedeutet der Fehlercode?
The measured air mass from the mass air flow sensor is lower than the value calculated by the engine control module, and the code is set when the difference becomes too large. Possible causes are a leak in the intake, poor contact, a wiring fault such as a break or a short to ground, or damage to the sensor itself.
Mögliche Ursachen
- Air leakage in the intake system
- Contact resistance in the sensor connectors
- Signal wire short-circuited to ground
- Open circuit in the signal wire or power supply
- Damaged mass air flow sensor
Was Sie tun können
- 1Check that the intake hoses are sealed, since a leak gives too low a measured air quantity
- 2Check the mass air flow sensor connectors for contact resistance and oxidation
- 3Use a multimeter to check that the signal wire is not shorted to ground or broken, and that the supply is intact
- 4If the fault remains, have a workshop check the mass air flow sensor
Symptome, die Sie bemerken können2
- The malfunction indicator lamp comes on
- The engine performs worse
Was der Fehler beeinflussen kann3
- Calculated boost pressure is used instead of a measured value
- Rear oxygen sensor control is switched off
- Misfire detection is switched off
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.