MECP Exam Questions & Answers 2024/2025
What is found on Pin 1 of the OBD II - ANSWERSLSDT CAN High
What is found on Pin 9 of the OBD II - ANSWERSLSFT CAN Low
Define the XOR gate - ANSWERSBoth inputs can not be TRUE for a TRUE output. If they are the output is FALSE.
What is a logic g...
What is found on Pin 1 of the OBD II - ANSWERSLSDT CAN High
What is found on Pin 9 of the OBD II - ANSWERSLSFT CAN Low
Define the XOR gate - ANSWERSBoth inputs can not be TRUE for a TRUE output. If they are the output is
FALSE.
What is a logic gate - ANSWERSProduce a specific output state based on the condition of one or more
inputs.
What determines the polarity of the current to trigger a transistor - ANSWERSThe middle letter
What are the different layers of MOST - ANSWERSPhysical layer
Data link layer
Network layer
Transport layer
Session layer
Presentation layer
Application layer
If a circuit design requires a threshold voltage of 5.1v and a 5.1v Zener diode is used with 10% tolerance,
what is the range - ANSWERS4.845v low
5.355v high
What are the names of the start and stop codes with he asynchronous signal - ANSWERSStart of frame
SOF
,End of frame EOF
How do you determine the in and out of the MOST network - ANSWERSRemove the most plug from the
device while the vehicle is asleep and shine a flashlight into the housing. The device will reapond from
the output side with a res beam of light.
What is a XNOR gate - ANSWERSA combination XOR gate followed by an inverter. Its output is true if the
inputs are the same and false if the inputs are different.
What are the two most common forms of logic gate arrays implemented into integrated circuits -
ANSWERSTransistor transistor logic TTL
Complentary Metal Oxide Semiconductor CMOS
Describe MOST 25 - ANSWERSThe device will have constant power, chassis ground, and usually a wake
up diagnostic wire. Typical colors are orange or green. Max speed of 25M baud and 512 bits
What does the bias on the base of a transistor control. - ANSWERSThe amount of current flowing
between the emitter and collector.
When using a Zener diode, where should a fuse be placed for circuit protection? - ANSWERSAfter the
Zener diode
Where does the arrow point in a bi polar transistor? - ANSWERSToward the N type material
What is Zener voltage? - ANSWERSThe diode's voltage threshold. Also known as avalanche voltage.
What is MOST 50? - ANSWERSCarried over UTP or unshielded twisted pa contains one pair of twisted
wires for input and a second pair for output. The pairs have a different teist rate. Max speed is 50 M
baud and 1024 bits.
,What is SAE1979 and ISO15031-5 - ANSWERSSpecifies a set of standard messages that can be used by
scan tools to obtain OBD II data from a vehicle.
What is synchronous? - ANSWERSData signals that are constant, meaning the signal never astops as long
as the computers are active.
What is MOST 150 - ANSWERS150 M baud and 3072 bits
Enables an ethernet channel in addition to the control message channel, streaming data channel and
packet data channel.
What does P stand for in an OBD II diagnostic code? - ANSWERSPowertrain
What does the power supply of a mobile amplifier do? - ANSWERSSwitches battery voltage to a higher
rail voltage
What is a NOT gate - ANSWERSThe output is opposite of the input. If the input is TRUE then the output is
FALSE.
What are the seven basic logic gates - ANSWERSAND
OR
XOR
NOT
NAND
NOR
XNOR
What is a MOSFET and what are its parts? - ANSWERSMetal Oxide Semiconductor Field Effect Transistor
1 Gate
2 Source
, 3 Drain
What is needed to work around a Hybrid vehicles Orange covered wiring? - ANSWERSInsulated Class 0
electrical linemans gloves
What is OBD II and what does it do? - ANSWERSSecond generation On Board Diagnostics created in 1996
to provide technicisns eith a universal set of basic fiagnodtic capabilities.
What is hole flow? - ANSWERSThe opposite direction of electron flow.
Are electrons positively or negatively charged? - ANSWERSNegatively
What is a Zener Diode and what is its function? - ANSWERSA special kind of diode based on the initial
work of Dr. Carl Zener in 1934. It functions as a voltage regulator when reverse biased.
What is Pin 2 of the OBD II - ANSWERSJ1850 Bus+ (VPW and PWM)
What is Pin 4 of the OBD II - ANSWERSChassis Ground
What is Pin 5 of the OBD II - ANSWERSSignal Ground
What is Pin 6 of the OBD II - ANSWERSCan High (J-2284)
What is Pin 7 of the OBD II - ANSWERSISO9141-2 K Line of KWP
What is Pin 10 of the OBD II - ANSWERSJ1850 Bus (PWM only)
What is Pin 14 of the OBD II - ANSWERSCan Low (J-2284)
What is Pin 15 of the OBD II - ANSWERSISO 9141-2L Line or KWP
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