VOLVO
ECM-P040936 - Exhaust Gas Recirculation Sensor A Circuit. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal frequency too low
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 code is named for a signal frequency that is too low. The ECM monitors the PWM signal from the EGR valve position sensor and sets the code when that signal is incorrect.
Możliwe przyczyny
- Fault codes ECM-P040937 and ECM-P040938 may share the same cause and should be read together
- EGR valve is stuck in the open or closed position
- Sticking EGR valve
- Damaged position sensor or damaged EGR valve
- Contact resistance or oxidation in the connectors
- Break in the signal cable
Co możesz zrobić
- 1If you have a diagnostic tool, read the fault status with the engine running and see whether it is active or only stored
- 2Check that the EGR valve moves without sticking while the engine runs
- 3Check that the connectors to the position sensor are firmly seated and not oxidised
- 4Use a multimeter to check that the signal cable has no open circuit
- 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.