Electrical Flashcards
What is multiplexing
A concept where transmission of more than one electrical signal or message takes place over a single or pair of wires.
What is typology
Describes how modules are connected to one another.
Bus
Star
Ring
What is network protocol
Refers to the rules or standards used to communicate over the networks. Device naming fault code structure and physical layer are examples of this
What is time division multiplexing
Requires the modules and other devices to take turns, sharing the data bus communication pathway
What is MID (message identifier)
Identifies which module is reporting the fault
What is SID
Identifies a specific failed component or replaceable subsystem
What is a parameter identifier (PID)
A value being reported
What is FMI
Fault mode identifier
Type of failure detected in the system
What is a customer programmable parameter
Seat memory, radio station, cruise control, idle time
Where does 5v reference come from
From voltage regulator in ecm
What is an anolog signal
An electric current that is proportional to a continuously changing variable, looks like a heart monitor
What is a digital signal
Signals that represent 1-0 yes or no, on or off
What is a bit (binary digit)
Smallest piece of digital or binary info represented by a 1 or 0
What is a byte
A combination of 8 bits
What is serial data
Data transmitted in series one bit after another along a single or pair of wires
Anolog to digital conversion
To covert anolog signals to digital binary info, buffers or anolog to digital converters are used
What is pulse width modulation
Refers to a signal that varies on or off
What is duty cycle
Another unit for measurement for PWM signals, duty cycles is measured as a percentage, on time versus off time
What is ROM (read only memory)
Permanent storage of instructions and fixed values such as overheat temp type of trans ecm can only read and cannot change instructions in the ROM
What is RAM (random access memory)
Temp storage for info that needs to be accessed quickly, ram memory is bith readable and writable
What output sigbal does a magnetic pulse generator produce
A/C low voltage
What output sugnal does a hall effect switch produce
Digital over 5v
What output does a decent and ptc produce
Conditioned DC voltage
