Retrieving and recording DTC's, monitor status, and data are integral steps in diagnosing faults within vehicle systems.

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

Fluids at rest possess no flow energy. a)- true b)- false

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false