VOLVO
ECM-436D - Leak diagnostic unit. Signal too 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:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (14)
- Volvo S60 (2001–2009)2005–2006Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2008–2009Engine B5204T5, B5244T5, B5254T2 only
- Volvo S80 (1999–2006)2005–2006Engine B5204T5, B5244T4, B5254T2, B6294S2, B6294T only
- Volvo V70 (2000–2008)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2006–2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2008Engine B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2005All engines except: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2007Engine B5254T2 only
- Volvo XC90 (2003–)2005–2006Engine B5254T2, B6294T only
- Volvo XC90 (2003–)2007–2012Engine B5254T2 only
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
- Volvo XC90 (2003–)2015
What does this fault code mean?
The engine control module monitors the pump power consumption during the reference phase. If the consumption drops below a set value, the fault code is set and the leak diagnostic is disabled. The fault can come from poor contact in the connections or a damaged leak diagnostic unit.
Possible causes
- Contact resistance in the connections
- Damaged leak diagnostic unit
What you can do
- 1Have a workshop check the engine control module software on cars of model year 2003 to 2008 before the leak is searched for
- 2Have you got a diagnostic tool: read the pump power consumption in live data during the reference phase and check whether it is lower than normal
- 3Check the connector to the leak diagnostic unit for contact resistance and oxidation
- 4Keep the battery voltage correct throughout the test and connect a battery charger if needed
- 5Have a workshop replace the leak diagnostic unit if the connector is sound but the fault remains
Symptoms you may notice1
- Malfunction indicator lamp (MIL) is on
What the fault can affect1
- The leak diagnostic is disabled
General guidance for car owners. Diagnosis on the car can point to a different cause.