Need explanation on Commanded EGR and ethanol%

What does commanded EGR mean?

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 is EGR on OBD2?

“EGR” stands for exhaust gas recirculation. When engine combustion temperatures near 2500°F, the formation of smog-producing nitrogen oxides (NOx) increases. Exhaust, however, is mostly composed of carbon dioxide (CO2), which does not burn.

What is engine exhaust gas recirculation system monitor?

The EGR system monitor allows the PCM to test the function and the exhaust gas flow through the EGR system. The monitor is activated during EGR system operation that occurs under normal engine and vehicle operating conditions.

What should commanded evaporative purge?

Commanded Evaporative Purge — This value should read 0% when no purge is commanded and 100% at the maximum commanded purge position/flow. Commanded Throttle Actuator — This value should be 0% when the throttle is commanded closed and 100% when the throttle is commanded open.

What damage can a faulty EGR valve cause?

A faulty EGR valve can cause problems with the flow and operation of the EGR system leading to performance issues including a reduction in power, reduced acceleration and decreased fuel efficiency. It can also cause vehicle emissions to increase.

What does command EVAP mean?

The evaporative emissions control system (EVAP) on your vehicle is designed to prevent fuel vapors from escaping into the atmosphere from your gasoline tank.

What happens if purge valve is stuck closed?

If the vapor canister purge valve is stuck closed instead of open, the valve won’t push any fuel vapors back into the engine. Instead, they’ll run straight out of the exhaust, which will cause much higher emission levels. Of course, you probably won’t notice this unless you take your vehicle in for an emission test.