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Was able to see TPS changes smoothly on scanner. With scanner plugged in, turn key to position 2, don't crank. OBDII scanner will boot up, and display values, including the TPS percentage. My bottom reading was 9.4%, which may vary from truck to truck. Pressed gas pedal slowly, and % changed slowly, always up, and never by very large jumps. Floored was 90%, again that may vary by truck. Release quickly and it is right back to original low percentage. Move pedal, and percents changed smoothly and without unexpected jumps.
This might be a quick check when a TPS is suspect, and volt meter not on hand.
The throttle on a DI is set up for offroading, very small inputs on the throttle move it very little to allow you to "finesse" the truck into places you probably shouldn't be going.
That is why you saw small increases on the TPS, the bottom half of the throttle is "geared" low and the top half is "geared" higher for quicker throttle response at higher speeds.
The LR3 and LR4 both have a "fly by wire" throttle and when you put the t-case into lo range it changes the TPS values for offroading so that small inputs can be done.
Kinda cool but I still am not a fan of fly by wire throttles.
Basic TPS test with scanner
