Positive Crankcase Ventalation and Exhaust Gas Recirculation
EGR { Exhaust Gas Recirculation} Flow Malfunction Early Exhaust Gas Recirculation (EGR) systems components include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.
The EGR valve is located on the top of the intake manifold rearward of the throttle crank under the cowl. If you suspect a problem with the system, you may want to check the EGR control solenoid, the EGR control backpressure transducer and all vacuum hoses.
The PCM controls the EGR valve, so the EGR position sensor tells the PCM what position the EGR valve is in, so it can control the EGR valve and ake other necessary adjustments.
AN EGR (Exhaust Gas Reclaimer) sensor monitors the EGR and sends a signal to the ECM (Engine Control Module) letting the ECM know if the EGR is open or closed or anywhere between.
The P0409 code indicates an exhaust gas recirculation (EGR) circuit malfunction. It could be a bad EGR valve, a bad EGR optical sensor, a bad powertrain control module (PCM), or a bad electronic control Module (ECM), also referred to as the engine control module.
An EGR (Exhaust Gas Re-circulation) valve position sensor sends a signal to the ECM (Engine Control Module) what the EGR valve position is. This is to confirm that the EGR has responded to a command sent from the ECM.
The EGR (Exhaust Gas Recirculation) valve opens when vacuum is applied. The EGR vacuum solenoid opens and closes the vacuum supply to the EGR valve when it is commanded to do so by the ECM (Engine Control Module).
The idle air control valve is located on the throttle body, and the EGR valve is located on the intake manifold.
It means something is not right with the car's EGR valve.These are possible causes, starting with the most common.Bad EGR solenoidExcessive resistance in control circuit (PCM controlled ground) due to an open, chafing or damage to the harnessPoor connection at the EGR solenoid harness (worn or loose pins)Water intrusion at the EGR solenoid harnessBlockage in EGR control solenoid holding solenoid open or closed causing excessive resistanceLoss of supply voltage to EGR solenoid
EGR stands for Exhaust Gas Recirculation. The purpose of the EGR system is to lower the amount of oxides of nitrogen the engine produces. The parts of the system are the vacuum actuated EGR control valve, the vacuum switching valve, and the EGR vacuum modulator assembly.
The EGR valve was not needed. Dodge was able to meet emission requirements by fuel and timing control.
The manufacturer was able to meet the tail pipe emission requirement without EGR through timing and fuel control.The manufacturer was able to meet the tail pipe emission requirement without EGR through timing and fuel control.