Exam 5: Computers and Input Sensors

A serial data stream is a analog code that is known as a binary code.

The power train control module may be found everywhere on the vehicle, EXCEPT:

Technician A says that a MAF may contain either an electrically heated hot wire or film. Technician B says that the PCM changes the current supplied to the MAF sensor in order to maintain the hot wire or hot film temperature. Who is correct?

The AFS operating temperature is 750°F (400°C), which is substantially colder than the conventional oxygen sensor operational temperature of 1200°F (650°C).

A twisted pair of wires helps to eliminate the induction of electro-magnetic-interference (EMF).

The wide range air/fuel ratio sensor (AFS) heater element circuit operates very similarly to that of an oxygen sensor's heater element circuit.

What is the process called that changes an analog signal, such as a variable voltage signal, into a digital binary code signal?

What is a speed density program and how does it work?

What is the special software program called that is designed to manage the operation of all system monitors?

What is a controller area network (CAN)?

What are the three speed categories of serial data transfer specified for CAN systems?

Prior to OBD II, most automotive PCMs used an unalterable programmable read-only memory (PROM).

The major difference in the air/fuel sensor operation compared to the conventional oxygen sensor is in the signal generated to the PCM.

Physically, the air/fuel ratio sensor looks very similar to a conventional oxygen sensor from the outside.

An air/fuel ratio sensor is used instead of a conventional oxygen sensor because:

What is the PCM test called that compares sensor inputs to one another to see if the information makes sense when analyzed as a group?

Technician A says that low compression on an engine cylinder can be successfully compensated for by the PCM with no adverse effect on performance or emissions. Technician B says that the PCM and catalytic converter can mask or hide some basic engine defects. Who is correct?

What type of tools may be used to monitor the operation of a conventional oxygen sensor?

Technician A says that when the voltage output of an air/fuel ratio sensor shifts below 3.3 V, it indicates a rich air/fuel mixture ratio. Technician B says that when the voltage output of an air/fuel ratio sensor shifts below 3.3 V, it indicates a lean air/fuel mixture ratio. Who is correct?

How is network data transmission speed expressed?