Week #1 - Chapter 1 and 2 Flashcards
What unit of electricity is used as a signal for a computer?
Volt
True or False?
The MIL will flash if a misfire or fuel trim condition does exist that can cause damage to the catalytic converter.
True
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.
First, Second Consecutive
What does the PCM do during a drive cycle to test emission-related components?
The PCM performs active and intrusive tests of the components if the operating conditions of the vehicle match the enabling criteria.
________ 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.
Volatile, Nonvolatile
What part of the vehicle computer is considered to be the brain?
CPU
When a fault is detected, when isa pending code set?
The first fault of a two trip failure.
The computer will automatically clear a DTC if there are no additional detected faults after ________.
Forty consecutive warm-up cycles.
Which DTC could indicate that the gas cap is loose or defective?
P0442
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?
The MIL is turned off.
DTC P0302 is a ________ DTC.
Generic
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.
False
OBD II has been on all passenger vehicles in the United States since what year?
1996
How many terminals are in an OBD-II DLC?
16
An ignition misfire or fuel mixture problem is an example of what type of DTC?
Type A
When a type A or B diagnostic trouble code is set, what is generated on an OBD-II vehicle?
A freeze frame
Analog signals from sensors are changed to digital signals for processing by the computer through which type of circuit?
AD converter
What two things can a vehicle computer actually perform (output)?
Turn something on or turn something off.
The SAE term for the vehicle computer is ________.
PCM
What are the four basic computer functions?
Input, processing, storage, and output
All OBD II vehicles use what type of read-only memory?
EEPROM
The “brain” of the computer is the ________.
CPU
“Clock Speed (Hz)” measures what?
Computer processing speed
RPM, Throttle position angle sensors and Engine coolant temperature sensors are all considered components for which computer function?
Computer “Input”
Fuel injector, Transmission shift solenoid, Evaporative emission control solenoid are all considered components for which computer function?
Computer “Output”
