VOLVO
ECM-P040938 - Exhaust Gas Recirculation Sensor A Circuit. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal frequency incorrect
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
5 modellerS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Vis modeller per årsmodell og motor (6)
- Volvo S80 (2007–)2007–2009Kun motor: D5244T4, D5244T5
- Volvo V70 (2008–)2008–2009Kun motor: D5244T4, D5244T5
- Volvo XC60 (2009–)2009Alle motorer unntatt: B6304T2
- Volvo XC70 (2008–)2008Alle motorer unntatt: B6324S
- Volvo XC70 (2008–)2009Kun motor: D5244T4, D5244T5
- Volvo XC90 (2003–)2013–2014Kun motor: D5244T18, D5244T5
Hva betyr feilkoden?
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.
Mulige årsaker
- 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
Hva du kan gjøre
- 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
Symptomer du kan merke1
- The Check engine (malfunction indicator) light comes on or behaves abnormally
Hva feilen kan påvirke1
- EGR control is lost
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