Week #1 - Chapter 1 and 2

Question 1

What unit of electricity is used as a signal for a computer?

Answer 1

Volt

Question 2

True or False?

The MIL will flash if a misfire or fuel trim condition does exist that can cause damage to the catalytic converter.

Answer 2

True

Question 3

A type A DTC is fuel or misfire related and will cause the MIL to be turned on during the ________ trip. A type B DTC will turn on the MIL after the ________ trip.

Answer 3

First, Second Consecutive

Question 4

What does the PCM do during a drive cycle to test emission-related components?

Answer 4

The PCM performs active and intrusive tests of the components if the operating conditions of the vehicle match the enabling criteria.

Question 5

________ RAM means that old data is lost when power is removed. ________ RAM means that data is kept in the chip even after power has been removed.

Answer 5

Volatile, Nonvolatile

Question 6

What part of the vehicle computer is considered to be the brain?

Answer 6

CPU

Question 7

When a fault is detected, when isa pending code set?

Answer 7

The first fault of a two trip failure.

Question 8

The computer will automatically clear a DTC if there are no additional detected faults after ________.

Answer 8

Forty consecutive warm-up cycles.

Question 9

Which DTC could indicate that the gas cap is loose or defective?

Answer 9

P0442

Question 10

The codes are cleared with a scan tool. Power to the PCM is disconnected. The vehicle is driven on three consecutive trips with a warm-up cycle and meets all code set conditions without the PCM detecting any faults. What would be the result of these actions?

Answer 10

The MIL is turned off.

Question 11

DTC P0302 is a ________ DTC.

Answer 11

Generic

Question 12

True or False?
A generic scan tool can access the same information at the same rate as an enhanced original equipment manufacturer’s scan tool.

Answer 12

False

Question 13

OBD II has been on all passenger vehicles in the United States since what year?

Answer 13

1996

Question 14

How many terminals are in an OBD-II DLC?

Answer 14

16

Question 15

An ignition misfire or fuel mixture problem is an example of what type of DTC?

Answer 15

Type A

Question 16

When a type A or B diagnostic trouble code is set, what is generated on an OBD-II vehicle?

Answer 16

A freeze frame

Question 17

Analog signals from sensors are changed to digital signals for processing by the computer through which type of circuit?

Answer 17

AD converter

Question 18

What two things can a vehicle computer actually perform (output)?

Answer 18

Turn something on or turn something off.

Question 19

The SAE term for the vehicle computer is ________.

Answer 19

PCM

Question 20

What are the four basic computer functions?

Answer 20

Input, processing, storage, and output

Question 21

All OBD II vehicles use what type of read-only memory?

Answer 21

EEPROM

Question 22

The “brain” of the computer is the ________.

Answer 22

CPU

Question 23

“Clock Speed (Hz)” measures what?

Answer 23

Computer processing speed

Question 24

RPM, Throttle position angle sensors and Engine coolant temperature sensors are all considered components for which computer function?

Answer 24

Computer “Input”

Question 25

Fuel injector, Transmission shift solenoid, Evaporative emission control solenoid are all considered components for which computer function?

Answer 25

Computer “Output”