VOLVO
ECM-130B - Mass air flow (MAF) sensor. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (8)
- Volvo C30 (2007–2013)2007–2011Engine B5244S4 only
- Volvo C70 (2006–2013)2006All engines except: B5254T3
- Volvo C70 (2006–2013)2007–2010Engine B5244S4, B5244S5 only
- Volvo C70 (2006–2013)2011Engine B5244S4 only
- Volvo S40 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo S40 (2004–2013)2005–2010Engine B5244S4, B5244S5, B5244S7 only
- Volvo V50 (2004–2013)2004Engine B5244S4, B5244S5 only
- Volvo V50 (2004–2013)2005–2010Engine B5244S4, B5244S5, B5244S7 only
What does this fault code mean?
The fault concerns the MAF sensor circuit, which the engine control module (ECM) monitors. It is set when the module detects a short to ground or voltage in that circuit, or an open circuit. Although the code is labelled too low, a short to voltage can set it as well.
Possible causes
- Signal wire shorted to ground
- Open circuit in the signal wire
- Signal wire shorted to voltage
- Damaged MAF sensor
What you can do
- 1Read the fault code, clear it and test drive to see whether it returns
- 2Watch the MAF reading in live data with the engine running; a reading that is wrong at the moment points to a permanent fault, a correct one to a sporadic fault
- 3Check the MAF sensor connector for contact resistance and oxidation
- 4Check the MAF wiring for chafing, pinch damage and loose clips
- 5With a multimeter, check that the signal wire has no contact with ground or voltage and that it has no break
- 6If the wiring looks fine: have a workshop check the MAF sensor
Symptoms you may notice2
- Engine warning lamp comes on
- Engine feels jerky
What the fault can affect1
- The value is worked out from engine speed and intake pressure instead of being measured
General guidance for car owners. Diagnosis on the car can point to a different cause.