Throttle Position Sensor (TPS)

There are two types of TPS, the switch type, which only sends a signal back to the ECU at idle, and full throttle. And the linear type which is the one that we tested. This type uses a potentiometer, similar to that of the airflow meter, to vary resistance which varies the signal back to the ECU.
All of the results we got were within specifications, except for the idle to earth circuit with a .35mm gap between the lever and the stop. We got infinity for this result, which means it is an open circuit. At this point, it should have been a closed circuit with a resistance of about 2300 ohms. This infinity result was because the idle circuit was opening too soon. This fault was remedied by adjusting the TPS. This is done by putting .48mm gap between the lever and stop, loosening the mount screws of the TPS and turning the TPS until the ohm meter reads open circuit. Tighten the screws and the TPS is now set correctly.
However, the Voltage at throttle angle (VTA)  and Earth (E2) circuit at closed throttle was within specs at 532 ohms and at wide open throttle (WOT) was within specs at 3300 ohms. What this means is that as the throttle gets wider open, the reisistance gets higher, meaning a weaker signal will be sent to the ECU.
The resistance through the Voltage constant (VC) and earth circuit was constant and within specs at 4180 ohms. This value should not change because the resistance is not varying.

Throttle body: It is important that the throttle body is kept clean. There are many reasons for this:
-So no deposits can interfere with setting the idle.
-So no dirt will be sucked into the engine.
-So the butterfly valve doesnt get jammed, by means of dirt getting lodged between the wall of the throttle body, and the valve itself, which could cause it to jam open.

-So dirt doesn't get lodged in where the needle, that holds the valve, goes through the throttle body. This could also cause the valve to jam open.