190204a Electronic Fuel Fundimentals Flashcards
(24 cards)
Sensors, switches, and data links are forms of what?
Input devices
A technician can access the ECM through the use of what?
A data link connector
Baud rate is what?
The speed of communication between control modules
What is the term protocol mean?
A common language used between control modules
Typical voltage range of a tps is what?
.5-4.5 volts
What is the purpose of engine warning lights
The ECM runs warning lights on when there is a problem affecting engine performance
An open in a temperature sensor surface what give what voltage reading
Higher then normal voltage
A short in a temperature sensor circuit should give what kind of reading
Voltage low
A digital signal can be described as a?
A signal that is either on or off.
Why are diagnostic trouble codes generated
Due to operation outside a set of stored parameters
Output devices are what?
Actuators and displays
Multiplexing is for what purpose?
For sharing information between control modules
What is protocol?
A common language used in the system
After leaving the ecm voltage goes through what before reaching the sensor?
A current limiting resistor
How does a ECM interpret a temp sensor?
By reading the voltage drop and comparing it to a predetermined value
A reluctance type sensor reads what?
Rpm
How does a TPS work?
The movement of the pedal generates a variety of voltage signals
At full throttle, what kind of voltage could the ECm see through the tps
5 volts
Why are fault codes logged into the memory
So a technician can determine if the problem is isolated or systemic
When using the SAE fault code system, the type of failure is determined by what
A 2 digit failure mode identifier number
What the difference between a hard code and a soft code?
Hard codes are active soft codes are stored
Positive coefficients temp means what?
As temp rises resistance also rises.
Negative coefficient of temp means what?
As temp rises resistance decreases
Converting analog to a digital signal is called what
Encoding
