MECP Advanced Study Guide – Flashcards
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Voltage
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Difference of electrical potemtial
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Current
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Flow of electrons
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Rectification
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Process that AC is changed into DC.
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Alternator
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3 phase, 6 rectifier diodes
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One Coulomb
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6.24 x 10 electrons
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Resistance
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Opposition to current flow
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OHM's Law
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E/IxR P=IxE
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Power
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Conversion of one kind of energy into another over a period of time
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Law of conservation
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Energy consumed by any component cannot be magically destroyed or mystoriously lost
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Joules
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Energy required to move one coulomb(one volt)
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Kirchoff's voltage law
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Voltage applied to a dc series curcuit must equal the sum of the voltage drops
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Kirchoff's current law
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Total current entering a point/junction in a circuit must equal the sum of the currents leaving that point
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Voltage Divider
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Used Commonly on fords premium sound system to drop voltage for amp turn on wire. V-out=V-in x (R2/(R1+R2))
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Capacitor
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Opposes change in voltage
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Inductor
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Opposes any change in current flow Air core(large/cost more) Iron core Ferrite core(cheapest)
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SPDT Relay
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Coil, springs, contacts 150ma 86/85 coil terminals 30 common 87a N/C 87 N/O
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Diodes
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Use Ohm's to test OL=Open Circuit Reads in both directions= Shorted Anode(+) Cathode(-)
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Transistors
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Collector, Base, Emitter NPN/PNP
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Automotive Battery
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Secondary Battery because you can recharge it.
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Parastic current drain
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current drain while vehicle is off(20-30ma)
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Ignition Switch
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Off- supply Acc.-supply, Acc Run- supply, Acc, Ign 1& 2 Start- supply, Ign 1 and start.
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Fuses
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blade fuses(ATC, MINI ATM, MAXI, LOW PROFILE ATC) Glass fuses(AGC, AGU) High current(ANL) circuit breaker Fuses 18in away at most from power source. (protect wiring)
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Identifying HS/MS Can Bus
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use peak/hold or min/max vdc 3.5v on Can H 1.5v on Can L
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Identifying LSFT Can Bus
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use peak/hold or min/max vdc Active 4vdc can H and 1vdc can low Recessive 1.76vdc can H and 3.25 can low
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Single can wire
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Known as GM LAN
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MOST
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Media Oriented System Transport
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Vehicle VIN number
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10th digit is the model year.
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P-A-S-S
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Pull the pin Aim at the base of the fire Squeeze the handle Sweep from side to side
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Fire extinguishers
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Halon or Multi class (halon slowly being phased out)
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Seatbelt bolts
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Use T-45 or T-50
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Unibit (step drill bit)
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Used commonly on firewalls to run wires through.
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Crimping tools
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seem on the connector should be lined up facing away from the jaw.
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Test Lights
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Not recommended(High risk)
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Oscilloscope screen
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Y Axis-voltage( Amplitude) X Axis-time(frequency)
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Hall-effect current clamp
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measures strength of the magnetic field
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Polarity tester
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accepted method for testing polarity
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RTA
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Shows frequancy responce of a signal with a reference input.
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Euro wire color
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black-SW blue-BL brown-BR gray-GR Green-GN Orange-OR Purple-LI Red-RO white-WS yellow-GE
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NTSC
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North america and south america
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PAL
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Most European
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SECAM
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France, eastern europe, africa, asia-pacific
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Troubleshoot
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Identify Isolate Eliminate
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Measuring MUX low current ignition
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OHM's
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HD Radio
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Hybrid-Digital
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Federal motor vehicle safety standard relating to avtive headrest restraints.
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FMVSS 202a
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GPS Satellites
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Minimum of 6 satellites are in view to receivers any where in the world. Need at least 3 GPS satellites to determine latitude and longitude and a 4th gps satellite for elevation. Gps signals are "line of sight"
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WAAS
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Wide Area Augmentation System
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GPS Antenna
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Must not be covered or blocked by metal surfaces. Plastics, fabrics, and fiberglass are ok. Do not cut or extend the GPS antenna cable. Wind the excess cable into large "S" or "Zigzag" shapes.
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Terrestrial repeaters
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Are land based buffers for satellite signals that must be deployed in areas with coverage problems.
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FCC
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Federal Communications Commission
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NTIA
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National Telecommunications and Information Administration
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VLS (vehicle locator system)
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Unit and Antenna has to be effectively hidden and wired to a good ground point and 12vdc constant.
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RF Network
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2-way communication
