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While discussing PCM monitor tests: Technician A says that some monitors only run after another monitor completes. Technician B says that the monitor tests are run when the scan tool activates them. Who is correct?

a. Technician A
b. Technician B
c. Both A and B
d. Neither A nor B

User Atin Singh
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2 Answers

4 votes

Answer: d. Neither A nor B

Explanation: A P0401 DTC (exhaust gas recirculation flow insufficient) is being discussed. Technician A says that a defective EGR valve could be the cause. Technician B says that clogged EGR passages could be the cause. OBD-II regulations require that the EGR system be tested. Technician A says that the PCM can monitor the commanded position of the EGR valve to determine if it is functioning correctly. Technician B says that the PCM can open the EGR valve and monitors for a change in the MAP sensor or oxygen sensor reading to detect if the system is functioning correctly.

User Pratiked
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2.9k points
5 votes

Answer:

D

Step-by-step explanation:

User Cjserio
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