What is exhaust gas recirculation flow insufficient detected?
What is exhaust gas recirculation flow insufficient detected?
This trouble code “insufficient EGR flow” means that there is not enough exhaust gasses flowing back into the incoming air to the engine. This OBD code basically means that the cars computer has tried to open the EGR valve, but it cannot get enough exhaust gas into the engine.
What is the diagnostic code for exhaust gas recirculation?
P0402 OBD-II Trouble Code: Exhaust Gas Recirculation Flow Excessive Detected. Cost of diagnosing the P0402 code. P0402 is a diagnostic trouble code (DTC) for “Exhaust Gas Recirculation Flow Excessive Detected”.
How does the exhaust gas recirculation system work?
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate.
How to check exhaust gas recirculation flow in Fiat p0401?
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM’s & DPFE voltage.
Why is exhaust gas recirculated into the intake manifold?
When conditions are correct, the PCM commands the EGR valve to open, allowing exhaust gases to be recirculated into the engine’s intake manifold. Introducing these inert gases into the engine lowers combustion temperatures and reduces NOx emissions. EGR is only needed in limited amounts under certain driving conditions.
What causes insufficient EGR flow?
This type of problem can have a wide range of causes: A failing DPFE sensor Restricted or clogged EGR tubes A clogged catalytic converter Carbon buildup on the EGR temperature sensor Faulty or lack of vacuum supply to the EGR Electrical problems with the EGR circuit Problems with the engine computer
What does exhaust gas recirculation flow malfunction mean?
OBD II fault code P0400 is defined as ” Exhaust Gas Recirculation Flow Malfunction”, and is set when the PCM (Powertrain Control Module) detects a problem with the amount of exhaust gas being rerouted to the inlet tract. Such a problem will cause a trouble code to be stored, and a warning light to be illuminated.
What are the symptoms of a leaking EGR valve?
A faulty EGR valve or related component may leave the valve in either the stuck open or stuck closed position. The symptoms of a stuck open EGR valve are a rough idle with a lean air fuel mixture. The engine has a major vacuum leak. The symptoms of a stuck closed EGR valve are pre-ignition, ping, and knock.
What is excessive EGR flow?
An EGR that has excessive flow can cause the engine to hesitate or stall on acceleration or have a very rough engine idle. The Check Engine Light on will cause the vehicle to fail emission testing. If the catalyst is blocked causing code, then it could cause engine to lose power or not start.
