Torque OBD App - What each PID means?

I'm using the Torque app to monitor the sensor readings and most of the PIDs are straight enough for my understanding but there are some which i don't. What does the following PID means? All these provide readings.

Absolute Throttle Position
Relative Throttle Position

Accelerator Pedal Position D
Accelerator Pedal Position E

Engine Load
Engine Load (Absolute)

Fuel Pressure
Fuel Rail Pressure

Voltage (Control Module)
Voltage (OBD Adapter)

The absolute position is the real throttle position
The relative throttle position is the learned throttle position.

Fuel rail pressure is the pressure after the fuel regulator.

The engine load is a reference to your throttle position. When idling or off throttle the engine load is the lowest. While cruising it is usually at the lower end (depending on how fast). Under acceleration it is higher load and n full throttle the highest.

What the letters D and E designate I don't know for sure but assume that it takes both readings from the potentiometer in the throttle pedal assembly.

The voltages are displayed to makes sure that everything is running stable.

Thanks Peter, It really helped!

I stilll have a few doubts pending:

What is the difference between engine load and absolute engine load?

Acc Pedal position D & E - what are the two readings? There should be only one potentiometer for the pedal right? The throttle is fly-by-wire.

You have a learnt loading and a theoretical loading. The learning capability of the ECU alters the loading according to what it has learned.

The potentiometer has got 3 pins. Yu can use it as a simple resistor, use it as potentiometer with increasing resistance, use it with decreasing resistance or use both at the same time. Using both means you have added failure protection.

Hi Peter, i found out that Absolute throttle position value in percentage matched closely with the Manifold throttle position. So that confusion is over

At WOT
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Foot off the pedal
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It should be reasonably close. This is all fine.