9000 Aero L4-2290cc 2.3L DOHC Turbo EFI HO (1997)
has only two states, on or off, the signal is said to be digital.
Example:
A throttle position sensor applies a voltage to a Motronic control module. The voltage level depends on the position of the throttle valve, so that
the voltage at the closed throttle position may be around 0.2 V and at wide open throttle about 4.5 V. The voltage is thus proportional to the angle
of the throttle butterfly valve and the value is said to be analogue.
Information about the throttle position can then be conveyed to other systems, such as the TCS, automatic transmission, etc., but as a PWM signal
rather that an analogue voltage.
PWM signals in this case always have a pulse ratio of 9% in the closed throttle position (higher when the accelerator is depressed), regardless of
any voltage drop or tolerances.
Pulse Width Modulation Signal Frequency
