VOLVO
CEM-DF04 - CAN-L, low speed network. Signal too low
System
Zentralelektronik (CEM)
Volvo-Modelle, für die dieser Fehlercode gilt
Dieser Fehlercode hat je nach Modell, Modelljahr oder Motor unterschiedliche Bedeutungen. Wählen Sie die Bedeutung, die für Ihr Fahrzeug gilt.
Gilt für folgende Modelle:
10 ModelleC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Modelle nach Baujahr und Motor anzeigen (10)
- Volvo C30 (2007–2013)2007–2013
- Volvo C30 Electric (2011–2013)2011–2013
- Volvo C70 (2006–2013)2006–2013
- Volvo S40 (2004–2013)2004–2012
- Volvo S60 (2001–2009)2005–2009
- Volvo S80 (1999–2006)2005–2006
- Volvo V50 (2004–2013)2004–2012
- Volvo V70 (2000–2008)2005–2008
- Volvo V70 XC / XC70 (2001–2007)2005–2007
- Volvo XC90 (2003–)2005–2015
Was bedeutet der Fehlercode?
The CEM detects a short to earth on CAN L in the low speed network, and the signal becomes too low. Communication between the control modules can then break down, and central locking and the radio may be affected. The fault most often lies in the cable or a connector in the network.
Mögliche Ursachen
- Short to earth on the CAN L wire in the low speed network, for example where the insulation has worn through
- Contact resistance in the connections in the network
Was Sie tun können
- 1Read the fault codes from every control module you can reach, and note which ones also show communication faults
- 2Gently flex the cable harness and tug the connectors with the ignition on. If the communication faults change, that shows where in the network the fault is
- 3Use a multimeter to check that the CAN L wire has no contact with earth or the body along its length
- 4Check the connectors on the CAN network for loose connections, corrosion and moisture
- 5Check that the harness is not chafed or worn against the body, especially at grommets and sharp edges
- 6The CEM should not be replaced for a CAN fault unless a workshop has confirmed an internal fault in the CEM
Symptome, die Sie bemerken können2
- The central locking does not work at all
- Radio interference
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.