VOLVO
ECM-980F - Air flow. Faulty flow
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 (17)
- Volvo C70 Cabriolet (1998–2005)2000Engine B5244S 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)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)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)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 ECM works out the air mass entering the engine from throttle position, engine speed, air temperature and atmospheric pressure, among other inputs. The calculated value is compared with the signals from the air mass meter and the intake pressure sensor. If either sensor deviates enough, the code is stored.
Possible causes
- Faulty signal from one of the sensors
- Exhaust camshaft has slipped a tooth
- Air leakage after the air mass meter
- Defective intake manifold pressure sensor
- Defective air mass meter
- Defective engine control module
What you can do
- 1Check for air leaks after the air mass meter, in the hoses and connections on the intake side
- 2If you have a diagnostic tool: read air mass and intake manifold pressure in live data at idle and when pressing the throttle; they should follow engine load
- 3Check that the air mass meter and the intake manifold pressure sensor are firmly fitted and have clean connectors
- 4If the exhaust camshaft may have slipped a tooth, have a workshop check the camshaft position against the crankshaft
- 5Uneven idle can come from the control module running on substitute values, which is not the same as a drivability fault that existed before. After repair: clear the code and test drive
Symptoms you may notice2
- Uneven idle
- Malfunction indicator lamp lit
What the fault can affect3
- The throttle closes under braking, and pedal input is ignored while the brake is pressed
- Cruise control is switched off for the driving cycle in which the fault was detected
- Engine speed is limited by fuel cut-off and capped at a low value
General guidance for car owners. Diagnosis on the car can point to a different cause.