P1490 Citroen Vacuum Cut Valve Bypass Valve
Possible causes
– Faulty Vacuum Cut Valve Bypass Valve
– Clogged vacuum hoses to the Vacuum Cut Valve Bypass Valve
– Vacuum cut valve bypass valve harness is open or shorted
– Vacuum cut valve bypass valve electrical circuit poor connection
– Clogged vacuum hoses to the Vacuum Cut Valve Bypass Valve
– Vacuum cut valve bypass valve harness is open or shorted
– Vacuum cut valve bypass valve electrical circuit poor connection
What about the obd code?
– An improper voltage signal is sent to ECM through vacuum cut valve bypass valve.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1490 Citroen Description
The vacuum cut valve and vacuum cut valve bypass valve are installed in parallel on the EVAP purge line between the fuel tank and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from being applied to the fuel tank. The vacuum cut valve bypass valve is a solenoid type valve and generally remains closed. It opens only for on board diagnosis.
The vacuum cut valve bypass valve responds to signals from the ECM. When the ECM sends an ON (ground) signal, the valve is opened. The vacuum cut valve is then bypassed to apply intake manifold vacuum to the fuel tank.
Citroen Vehicle:2013 Citroen,2012 Citroen,2011 Citroen,2010 Citroen,2009 Citroen,2008 Citroen,2007 Citroen,2006 Citroen,2005 Citroen,2004 Citroen,2003 Citroen,2002 Citroen,2001 Citroen,2000 Citroen,1999 Citroen,1998 Citroen,1997 Citroen,1996 Citroen,