Sentra Sedan L4-1597cc 1.6L SOHC (E16S) (1986)
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Digital signals are ON-OFF (Hi-Low) voltage pulses. This signal is a typical digital signal.
Examples of common digital signals are:
Battery Voltage
The ignition switch in the ACC or ON position provides a battery voltage signal to several control units. This informs the control unit of the ignition
position.
Switch to Ground
A door switch is a common example of a switch to ground. When the door is opened the door switch completes the circuit. The interior light is turned
on. In addition, the time control unit is sent an OFF signal indicating the door is open.
Pulse Voltage
A pulse voltage is made up of alternating high and low voltage signals of varying duration. These signals are counted by the control unit within a
predetermined time frame.
Analog Input Signals
An analog signal is a voltage that varies over a period of time. Analog signals are produced by sensors in the vehicle. Sensors change resistance to
deliver variable voltage signals. The Oxygen Sensor sine wave signals shown are typical analog signals. These charts are example signals printed using
CONSULT.
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The first chart shows an Oxygen Sensor lean (low voltage) condition.
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The second chart is a normal Oxygen Sensor voltage printout.
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The third chart illustrates an Oxygen Sensor rich (high voltage) condition.
Examples of common sensors are:
Temperature Sensors
Temperature sensors change resistance with a change in temperature. This temperature is converted into an analog voltage range.
