How does the EGR valve DC motor and position sensor work?
The lab scope is connected to the EGR valve DC motor and position sensor via a Measure lead TP-C1812B and Back Probe TP-BP85 and set to recorder mode . In recorder mode a streaming measurement is performed, continuously displaying the signals live on screen. Most measured signals vary slowly, except for the DC motor control signal.
How does idle control valve and oxygen sensor work?
This feature is not available right now. Please try again later. The idle control valve adjusts the engine rev’s for a cold start and on later models adjusts the idle when the engine is warmed up. The oxygen sensor relays to the ECU for your correct fuel mixture, this is just removal and cleaning as part of vehicle maintenance. Loading…
Why does the EGR valve open when the engine is warm?
Because the engine is warm, the ECU applies a negative voltage to the DC motor which makes the EGR valve open, which is visible in the slight drop of the position sensor signal voltage.
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.
Why is the EGR valve open at idle?
It is when the valve remains open when engine idle suffers. Sometimes, the engine may stall at idle because of the lean of the air-fuel mixture. It is possible for you to test the EGR valve at home, using a hand held vacuum pump.
The lab scope is connected to the EGR valve DC motor and position sensor via a Measure lead TP-C1812B and Back Probe TP-BP85 and set to recorder mode . In recorder mode a streaming measurement is performed, continuously displaying the signals live on screen. Most measured signals vary slowly, except for the DC motor control signal.
What are the symptoms of an EGR stuck open?
Other symptoms: An EGR stuck open may include a rough idle, rough performance at low engine speeds, stalling at idle, increase in fuel consumption, fuel odors, and possibly a check engine light on.
Why does the fuel management light stay on when the EGR is open?
This means the amount of hydrocarbon gases emitted from the tailpipe increases significantly producing a fuel smell. Your engine management light may stay on once your car detects an issue with the EGR valve. This could be caused when the EGR is either constantly closed or open.