Question

While discussing IM240 testing, Technician A says the HC, CO, and NOx readings are provided in grams per mile. Technician B says the test instruments provide average emissions readings for the complete 240-second test procedure. Who is correct? a. A only b. B only c. Both A and B d. Neither A nor B

Answer 1

C. Both A and B.

Technician A is correct in stating that the HC, CO, and NOx readings are provided in grams per mile, which means that the amount of emissions produced by the vehicle during driving is measured in units of grams per mile.

Technician B is also correct in stating that the test instruments provide average emissions readings for the complete 240-second test procedure. This means that the test instruments measure the average amount of emissions produced by the vehicle over a specific time period, which in this case is 240 seconds.

So both technicians are correct in their statements and provide different aspects of the IM240 testing process.