getting ready to adjust my tps and it says to measure terminal c of the harness and the specs are 4.5 V- 5.5 V. In order to adjust it you need the c terminal voltage to determine what terminal 3f should be at closed and wide open throttle. The voltage of my c terminal that im getting is 5.9 v. can anybody help me? i even tried putting a load on the battery to see if it would lower my c terminal voltage. i have a 96 protege 1.5l

 

I don't know why the voltage should be that high. Maybe a resistor is failing.

Richpin has a good video on Youtube on how to test a TPS.

 

while i have never done a tps on a protege, on the cars i have done them on, the voltages are very specific. and i would use an analog multimeter. i had to make a special connector that could interface with the switch and the meter on several cars. movement of the switch in very tiny increments would change the readings, this switch is very sensitive

 

i noticed that when i disconnect the idle air control valve connector the voltage drops a little and also when I disconnect another connector. The tps and iac valve connector wires all are zip tied inside a bunch with other wires too.

 

Maybe the insulation is failing and you have a power to power short?

I am only guessing. I don't want to lead you the wrong way.

 

there was oil inside the harnesses of my coolant temp sensor and crankshaft sensor I cleaned both of them up, but its still around 5.9 v. Maybe it's the accuracy of my dmm. But, I did find something interesting... When my car is in the on position, I noticed that I feel something going through my intake manifold, throttle body, air intake hose, and the hose that's connected to the valve cover which is also connected to the air intake hose. . I believe it may be air. Maybe this is a sign that my idle adjusting screw is letting in way too much air. I don't know though because it seems to be starting at the intake hose and I've already checked that for leaks. PLEASE HELP!!

 

You mean you turn the key to "on" without the engine running?
If that is the case i see only one system that moves something: the fuel system.
Because the pistons don't move no air should move.
But the fuel pump creates pressure in the fuel rail and when there is enough pressure the fuel pressure regulator opens and the fuel goes into the return line. If you put a stethoscope to the fuel rail and lines you should be able to verify this. If the fuel pressure regulator is damaged the fuel may dump into the intake manifold.

Did you mean the engine is idling? In that case there will be air going through the intake. The pistons move and suck air in.

The other hoses are related to the positive crankcase ventilation. When the engine idles air and fumes from the crank case will run through. They are also a source of vacuum leaks, even the oil filler cap can develop vacuum leaks.

 

yes, key is on and engine isn't running. I finally got around testing my coolant temp sensor harness. I'll provide a diagram of what I got. I'm really hoping that it is normal cause I really want to start racing this as soon as my birthday.

 

Honestly, I do not know if these are normal values. I hope Virgin1, grim_reaper, juanky or others are able to tell. The Haynes manual provides a testing procedure for the sensor, but not for the harness.

All the best.
Are you going to do autocross?