VOLVO
ECM-0646 - conditioning (A/C) relay Signal too low
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
4 modellerC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Vis modeller per årsmodell og motor (12)
- Volvo C30 (2007–2013)2007–2010Kun motor: B4164S3, D4204T
- Volvo C30 (2007–2013)2011–2012Kun motor: B4164S3
- Volvo C70 (2006–2013)2008Kun motor: D4204T
- Volvo C70 (2006–2013)2009–2010Kun motor: D4204T · Kun girkasse: MMT6, MPS6
- Volvo S40 (2004–2013)2004Kun motor: D4204T, D4204T2
- Volvo S40 (2004–2013)2005–2006Kun motor: B4164S3, D4204T, D4204T2
- Volvo S40 (2004–2013)2007–2010Kun motor: B4164S3, D4204T
- Volvo S40 (2004–2013)2011–2012Kun motor: B4164S3
- Volvo V50 (2004–2013)2004Kun motor: D4204T, D4204T2
- Volvo V50 (2004–2013)2005–2006Kun motor: B4164S3, D4204T, D4204T2
- Volvo V50 (2004–2013)2007–2010Kun motor: B4164S3, D4204T
- Volvo V50 (2004–2013)2011–2012Kun motor: B4164S3
Hva betyr feilkoden?
The engine control module (ECM) monitors the A/C relay and sets the code when the relay signal comes in below what is expected. The fault can lie in several places: the connections, the signal wire, the supply to the relay or the relay itself. The air conditioning may stop working.
Mulige årsaker
- Contact resistance or oxidation in the connections
- Signal wire open or shorted to earth
- Supply wire to the A/C relay open or shorted to earth
- Damaged A/C relay
Hva du kan gjøre
- 1Check that the air conditioning fuse is intact in the fuse box
- 2With the ignition off, check the connectors at the A/C relay for looseness, contact resistance and oxidation
- 3Use a multimeter to check that the signal wire has no short to earth (the body)
- 4If the fault remains, have a workshop check the supply and the relay and replace them if needed
Symptomer du kan merke1
- Air conditioning or temperature control does not work
Generell veiledning for bileiere. Feilsøking på bilen kan peke på en annen årsak.