Textbook Problem

While discussing OBD II systems: Technician A says that the PCM illuminates the MIL if a defect causes emission levels to exceed 2.5 times the emission standards for that model year vehicle. Technician B says that if a misfire condition threatens engine or catalyst damage, the PCM flashes the MIL. Who is correct?

1. Technician A

Technician B

Both A and B

Neither A nor B

To determine

While discussing OBD II system: the technician with correct approach.

Explanation of Solution

Given information:

Technician A says that the PCM illuminates the MIL if a defect causes emission levels to exceed 2.5 times the emission standards for that model year of vehicle.

Technician B says that if a misfire condition threatens engine or catalyst damage, the PCM flashes the MIL.

In case of an OBD II, the PCM (powertrain control module) illuminates the MIL (Malfunction Indicator Lamp) if a defect causes emission levels to exceed 1.5 times the emission standards for that model year of vehicle. This criterion is based on the FTP (Federal test procedure).

On the other hand, the indication of the MIL depends on the type of problem that has occurred...