Engine Electronic Control Systems--Sensors
off car check
TPS - Throttle Position Sensor(potentiometer) or Throttle Position Switch
Function: is to supply information to the ECU about the position of the car's throttle.
Malfunctioning of a TPS can result in improper data being fed to the ECU, which monitors engine performance, in respect to the fuel efficiency of the car.
How to check a Throttle Position Sensor?
1.we have to know the meaning of each pin: Vcc(power supply from ECU), E2(ground), VTA(the signal go back to ECU), IDL(throttle position of Ideal speed )
2.we use voltmeter to check the voltage of the throttle position angle
CTS (Coolant Temperature Sensor)
THW (Thermistor Water)
ECT (Engine Coolant Temperature)
We checked the thermistor of water first we know it will be control the engine coolant system, when the temperature change than it change the ohms so the signal voltage has change. Than told to ECU which temperature does engine have and also it can switch on/off the fan to coolant engine.
Experiment:
We put the thermistor into water and heat the water and check the temperature with a thermometer and use the ohmmeter measure the resistance between the terminals.
The manufacturer's specifications
Temperature Resistance
(deg C) (ohms)
-10 7,000-12,000
20 2,000-3,000
50 700-1,000
80 200-400
85+ Less than 200
Data from my experiment
Water temperature Resistance
(deg C) (ohms)
20 2,500
30 1,760
40 1,250
50 880
60 600
70 450
80 330
90 185
we can see the experiment data follow the manufacturer's specifications, and proved the water temperature changed the thermistor resistance.
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