VOLVO
ECM-P040938 - Exhaust Gas Recirculation Sensor A Circuit. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal frequency incorrect
System
Motorsteuergerät (ECM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
5 ModelleS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Modelle nach Baujahr und Motor anzeigen (6)
- Volvo S80 (2007–)2007–2009Nur Motor: D5244T4, D5244T5
- Volvo V70 (2008–)2008–2009Nur Motor: D5244T4, D5244T5
- Volvo XC60 (2009–)2009Alle Motoren außer: B6304T2
- Volvo XC70 (2008–)2008Alle Motoren außer: B6324S
- Volvo XC70 (2008–)2009Nur Motor: D5244T4, D5244T5
- Volvo XC90 (2003–)2013–2014Nur Motor: D5244T18, D5244T5
Was bedeutet der Fehlercode?
The fault concerns the frequency of the PWM signal from the EGR valve position sensor being incorrect. The ECM monitors the signal and sets the code when it is wrong.
Mögliche Ursachen
- EGR valve has jammed in the open position
- EGR valve has jammed in the closed position
- Sticking EGR valve
- Damaged position sensor
- Damaged EGR valve
- Contact resistance or oxidation in the connectors
Was Sie tun können
- 1If you have a diagnostic tool, read the fault status with the engine running and see whether the fault is active
- 2Check that the EGR valve does not stick in any position when it is driven
- 3Check the connectors to the position sensor for oxidation and contact resistance
- 4Check the signal cable for breaks, particularly near the connectors
- 5Clean the EGR valve of dirt and soot if needed
- 6If the fault remains, have a workshop check the position sensor and the EGR valve
Symptome, die Sie bemerken können1
- The Check engine (malfunction indicator) light comes on or behaves abnormally
Was der Fehler beeinflussen kann1
- EGR control is lost
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.