The following statements regarding the exhaust gas recirculation (EGR) valve are all correct except:

Low restriction exhaust systems will have no effect on EGR system operation.
B. Some systems monitor EGR operation using a manifold absolute pressure (MAP) sensor.
C. A potentiometer is used to determine EGR valve position.
D. The powertrain control module (PCM) controls vacuum-operated EGR valves.


Answer: B. Some systems monitor EGR operation using a manifold absolute pressure (MAP) sensor.

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