VOLVO
ECM-990A - Idle air trim. Speed too high/low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
9 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008), V70 XC (1998–2000), V70 XC / XC70 (2001–2007)
Show models by year and engine (16)
- Volvo C70 Cabriolet (1998–2005)1999, 2001–2002
- Volvo C70 Cabriolet (1998–2005)2000All engines except: B5244S
- Volvo C70 Coupé (1998–2002)1999All engines except: B5254S DENSO
- Volvo C70 Coupé (1998–2002)2000All engines except: B5244S
- Volvo C70 Coupé (1998–2002)2001–2002
- Volvo S60 (2001–2009)2001All engines except: B5244S, B5244S2, D5244T
- Volvo S70 (1997–2000)1999Engine B5204T3, B5204T4, B5234T3, B5234T7, B5254T only
- Volvo S70 (1997–2000)2000Engine B5204T3, B5204T4, B5234T3, B5234T7, B5244T only
- Volvo S80 (1999–2006)1999–2000All engines except: B5244S, B5244S2, D5252T MSA 15.8
- Volvo S80 (1999–2006)2001Engine B5204T5, B5234T7, B5244T3, B6284T, B6294S only
- Volvo V70 (1997–2000)1999Engine B5204T3, B5204T4, B5234T3, B5234T7, B5234T8, B5254T only
- Volvo V70 (1997–2000)2000All engines except: B5244S, B5244S2, B5244SG, B5244SG2, D5252T MSA 15.8
- Volvo V70 (2000–2008)2000All engines except: D5252T MSA 15.8
- Volvo V70 (2000–2008)2001Engine B5204T5, B5234T3, B5234T7, B5244T3 only
- Volvo V70 XC (1998–2000)1999–2000
- Volvo V70 XC / XC70 (2001–2007)2001
What does this fault code mean?
The idle speed control in the engine control module (ECM) has registered that engine idle speed is too high or too low compared with what the module expects. The fault has probably arisen in the fuel system, and the code is never set on its own. This means the cause usually lies in another part of the system.
Possible causes
- The fault has probably arisen in the fuel system
- The code is never set on its own, so the cause lies in another part of the system
What you can do
- 1Read all the fault codes in the engine control module and note which are stored together with this one
- 2Fault-trace the other codes first, especially those for the fuel system, because this code is never set on its own
- 3Remedy the fault in the fuel system; once it is fixed, clear the fault code and road test the car to see whether it returns
Symptoms you may notice5
- Poor performance and lack of power when driving
- Uneven idle
- Engine stalls during acceleration or deceleration
- Cruise control does not engage
- Red warning symbol and text message in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.