Does the PCM control EGR?
The PCM controls the EGR flow by opening or closing the EGR valve with a step motor. The EGR flow is monitored by the manifold absolute pressure (MAP) sensor, mass air flow sensor and the air/fuel ratio sensor.
What tells the EGR to open?
Vacuum operated EGR valves use a vacuum solenoid to vary the vacuum to the diaphragm and, in turn, open and close the EGR. Some valves also include a feedback sensor to inform the ECU of the valves position. These valves receive a pulse width modulated signal from the ECU, to regulate exhaust gas flow.
What is EGR error?
If the scan tool displays EGR Error at 99.2% and the EGR is commanded OFF, this indicates that the PCM is receiving information that the EGR valve position is greater than 0%. This may be due to an EGR valve that is stuck partially open or a malfunctioning EGR position sensor.
What does EGR stand for in an engine?
EGR valve stands for Exhaust Gas re-circulation. The Exhaust gas re-circulation valve takes exhaust gases from the exhaust manifold and puts them back into the intake chamber where they get sucked back into the engine and goes through the burning process for the second time.
What should I do if my EGR is not working?
Common EGR problems include: Pinging (spark knock or detonation) because the EGR system is not working, the exhaust port is plugged up with carbon, or the EGR valve has been disabled. The fix here is to inspect the EGR system, remove the EGR valve and check the valve and port for carbon, and remove the carbon from the port if it is plugged.
What’s the code for an EGR valve throw?
What code will an EGR valve throw have? The P0401 trouble code is related to your car’s exhaust gas recirculation (EGR) system, which controls an engine and reduces emissions. Suppose a computer-controlled valve gives a certain amount of gases back into your engine to be burnt with the air-fuel mixture.
Is there a diagnostic code for insufficient EGR flow detected?
The correct definition for this diagnostic trouble code P0401 is “Insufficient EGR Flow Detected“. YES.. your EGR valve could be bad causing this code. But chances are there is going to be something more causing your computer to flag this p0401 code.