VOLVO
ECM-150A - Mass air flow (MAF) sensor. Lower limit
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008)
Show models by year and engine (20)
- Volvo C70 Cabriolet (1998–2005)2000Engine B5244S only
- Volvo C70 Coupé (1998–2002)1999Engine B5254S DENSO only
- Volvo C70 Coupé (1998–2002)2000Engine B5244S only
- Volvo S60 (2001–2009)2001Engine B5244S, B5244S2 only
- Volvo S60 (2001–2009)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S60 (2001–2009)2006–2008Engine B5244SG only
- Volvo S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)1999–2000Engine B5244S, B5244S2 only
- Volvo S80 (1999–2006)2001Engine B5244S, B5244S2, B5244SG only
- Volvo S80 (1999–2006)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2003–2005Engine B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)2006Engine B5244SG only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2001Engine B5244S, B5244S2, B5244SG only
- Volvo V70 (2000–2008)2002Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2003–2005Engine B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2006–2008Engine B5244SG only
What does this fault code mean?
The engine control module (ECM) compares the mass air flow (MAF) sensor with the intake manifold pressure (MAP) sensor while lambda control is active. If the MAF sensor reads more than the MAP sensor, the fault code is set. The code can be set together with other fault codes, and then those should be traced together.
Possible causes
- The MAF sensor reads more air than the MAP sensor in the intake manifold
- Air leak in the intake system, for example in the hose between the MAF sensor and the throttle body
- Poor contact at the MAF sensor or the pressure sensor
What you can do
- 1Switch off the ignition and check the connectors at the MAF sensor and the pressure sensor for contact resistance and oxidation
- 2Check that the hose between the MAF sensor and the throttle body is intact, firmly fitted and not leaking
- 3Check that the hose between the pressure sensor and the intake manifold is airtight, undamaged and not trapped
- 4With a diagnostic tool, switch off A/C and seat heaters, then compare the MAF and pressure values in live data at idle and at higher speed
- 5If the fault remains, have a workshop check the MAF sensor and the pressure sensor
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.