I'm looking at making some modifications to my astra (Z18xe), so I need to know exactly how the fly by wire system works (compared to a standard cable throttle).
First, I assume that it consists of three parts, first the pedal, second the ecu and third a motorised throttle body.
What is the signal path for this set up?
Pedal position -> ECU -> motor (tb)
or Pedal position -> motor (tb) (bypassing ECU control)
Is the pedal position sensor simply a variable resistor, or voltage divider setup?
What is it's range (degrees) and corresponding voltage (sensor map) for the pedal?
What is the voltage (range also, ie 0-5V) and corresponding angle for the throttle butterfly (actuator map)?
How does the ECU get throttle position information, or does it know this already because it has "set" the throttle position by motor?
Finally, is there any idle control (solenoid) incorporated into the throttle body?