VOLVO
ECM-P040938 - Exhaust Gas Recirculation Sensor A Circuit. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal frequency incorrect
Układ
Sterownik silnika (ECM)
Modele Volvo, których dotyczy ten kod błędu
Dotyczy następujących modeli:
5 modeliS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Pokaż modele wg rocznika i silnika (6)
- Volvo S80 (2007–)2007–2009Tylko silnik: D5244T4, D5244T5
- Volvo V70 (2008–)2008–2009Tylko silnik: D5244T4, D5244T5
- Volvo XC60 (2009–)2009Wszystkie silniki oprócz: B6304T2
- Volvo XC70 (2008–)2008Wszystkie silniki oprócz: B6324S
- Volvo XC70 (2008–)2009Tylko silnik: D5244T4, D5244T5
- Volvo XC90 (2003–)2013–2014Tylko silnik: D5244T18, D5244T5
Co oznacza ten kod błędu?
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.
Możliwe przyczyny
- 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
Co możesz zrobić
- 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
Objawy, które możesz zauważyć1
- The Check engine (malfunction indicator) light comes on or behaves abnormally
Na co może wpływać usterka1
- EGR control is lost
Ogólne wskazówki dla właścicieli. Diagnostyka na samochodzie może wskazać inną przyczynę.