Exam 5: Computers and Input Sensors

Since the early 2000s, the wide-range air-fuel ratio sensor (AFS) has replaced the conventional zirconia oxygen sensor.

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

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

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

The air-fuel ratio sensor (AFS) has the ability to measure air-fuel ratios from as lean as 35:1 to as rich as 11:1.

What is the circuit over which serial data is transmitted called?

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

The air/fuel ratio sensor produces a voltage output relative to:

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?

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?

How is network data transmission speed expressed?

How does the air/fuel sensor generate a signal to the PCM and how does the PCM respond?

Technician A says that in a fuel injection system, the MAF sensors may be vane-type, heated grid-type, or hot wire-type. Technician B says that the PCM supplies a richer air-fuel ratio when it gets a signal that current flow is increasing to maintain temperature in the MAF module. 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).

Technician A says that when a DTC is cleared from the PCM memory, the system readiness monitors are also cleared. Technician B says that after an emissions repair is completed, the DTCs stored should be cleared from the PCM. Who is correct?

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

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

OBD II can store information about adjustments the PCM has made for component wear and varied operating conditions. The ability of OBD II to adjust calibrations to compensate for these defects and less-than-ideal conditions is known as:

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