190204

Question 1

What is an actuator

Answer 1

A device that receives signals from the ECM
IE- solenoids, torque motors, warning lights and fuel injectors

Question 2

What is an analog signal

Answer 2

A waveform that has a continual change in amplitude. Can be AC or DC sine wave

Question 3

What is a digital signal

Answer 3

Either on or off between two fixed voltages, commonly 0-5V with ECM circuits

Question 4

What are diagnostic trouble codes

Answer 4

Output signals generated by the ECM when it detects a system fault

Question 5

What is a parameter

Answer 5

A programable feature, can be either manufacture programable or customer programable

Question 6

Passwords are used to prevent what

Answer 6

Unauthorized access to parameters stored in the ECM

Question 7

Define pulse width modulation

Answer 7

Occurs when a circuit is rapidly turned on and off over a period of time.
-Pulse refers to the on-off and
-width refers to the amount of time the circuit is on compared to when it is off
-modulation means the circuit is controlled over a period of time

Question 8

Define sensor

Answer 8

Input devices that monitor pressure, temperature, fluid levels or mechanical movement

Some sensors are referred too as transducers

Question 9

What are some types of operator controlled switches AKA function switches

Answer 9

-Throttle pedal or throttle position sensor (tps)
-Cruise control
-P.T.O switches
-Retarder

Question 10

What is the diagnostic data link used for

Answer 10

Download new operating parameters into the ECM or to update stored information in the ECM

Often referred to as software reprogramming

Question 11

What main components does the EXM include

Answer 11

-operates on a dedicated power source from the vehicle (a key switch turns it on and off)
-A voltage regulator or power supply provides stable voltage for sensor operation
-input control consists of converters and amplifier that modify the sensor signal

Question 12

Define Ram

Answer 12

Random access memory
When power is lost the information stored is lost

Question 13

Define rom

Answer 13

Read only memory
Can only be retrieved programmed from factory and cannot be changed

Question 14

Define prom

Answer 14

Programable read only memory
Can be programmed at a later date but once they are programmed they cannot be changed

Question 15

Define EPROM

Answer 15

EPROM can be programmed