Input sensors & actuators ON-Vehicle

#1.0:
It is important to check voltage supply to the fuyel injector to make sure fuel is entering the cylinder. if theres lower voltage at the injectors than battery there maybe resisitance in the circuit or switching incorrectly or not at all.

#2.0:
The prpose of the reference voltage ot the throttle position sensor is to check power supply to sensor. Poor connection, bad earth, corrosion can all cause low reference voltage at the throttle position sensor.

#3.0:
The voltage on the earth side of the E.C.U is good. .03. It is important to measure so you know if the circuit is grounded and if its a good earth because you don't want a bad earth or high resistance beacause it might alter the signal voltage. Poor connections and corrosion could cause a bad earth.

#4.0:
When the T.P.S is at idle the voltage is low signal as the throttle opens voltage increases. (high signal) Closed throttle the sensor voltage should be 0v.66v. Open throttle the sensor voltage shoudl be .66v-5v.Bad connection in the potientcometer could prevent the T.P.S from sending the correct voltage to the ecu

#6.0:
And ECT sensor works when the engine is cold the voltage is high. As the engine heats up the voltageslowly decreases. when the ECT is cold it will send a high voltage signal to the injectors to richen up the mix because the engine isn't at operating temp yet. Faulty ECT sensor can cause incorrect voltage for the ECU.

#7.0:
The 0.03v reading tells us that the ECU earth is good because a bad earth connection could effect voltages in a series circuit. It is important to measure to check if the curcuit is complete and a good ground. Corrosion at the earth will cause a bad ground, even could break the ground and have an open circuit.

#4.0: (C.K.P)
The R.P.M sensor works as the speed increases the voltage increases a little bit. Using different functions are useful because they can tell you something other than voltage like how fast its working. A damaged sensor can effect signal voltage and also corrosion.

#5.0:
A map sensor works as the pressure in the manifold gets less the voltage drops. On idle voltage is high. pressure is high as you rev pressure decreases and so does the voltage. The reading are correct because the voltage is high on idle, low as you rev gthe engine. A cacuum leask can cause incorrect signal.