VOLVO
ECM-0646 - conditioning (A/C) relay Signal too low
System
Motorsteuergerät (ECM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
4 ModelleC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Modelle nach Baujahr und Motor anzeigen (12)
- Volvo C30 (2007–2013)2007–2010Nur Motor: B4164S3, D4204T
- Volvo C30 (2007–2013)2011–2012Nur Motor: B4164S3
- Volvo C70 (2006–2013)2008Nur Motor: D4204T
- Volvo C70 (2006–2013)2009–2010Nur Motor: D4204T · Nur Getriebe: MMT6, MPS6
- Volvo S40 (2004–2013)2004Nur Motor: D4204T, D4204T2
- Volvo S40 (2004–2013)2005–2006Nur Motor: B4164S3, D4204T, D4204T2
- Volvo S40 (2004–2013)2007–2010Nur Motor: B4164S3, D4204T
- Volvo S40 (2004–2013)2011–2012Nur Motor: B4164S3
- Volvo V50 (2004–2013)2004Nur Motor: D4204T, D4204T2
- Volvo V50 (2004–2013)2005–2006Nur Motor: B4164S3, D4204T, D4204T2
- Volvo V50 (2004–2013)2007–2010Nur Motor: B4164S3, D4204T
- Volvo V50 (2004–2013)2011–2012Nur Motor: B4164S3
Was bedeutet der Fehlercode?
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.
Mögliche Ursachen
- 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
Was Sie tun können
- 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
Symptome, die Sie bemerken können1
- Air conditioning or temperature control does not work
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.