Which is the best tool to measure the voltage output from a throttle position sensor?
Waveform notes A good throttle potentiometer should show a small voltage at the throttle closed position, gradually rising in voltage as the throttle is opened and returning back to its initial voltage as the throttle is shut.
Where is the throttle position sensor ( TPS ) located?
The throttle position sensor (TPS) is located on the throttle body. It is a type of variable resistor which changes its resistance value according to throttle position. As the throttle is opened, the voltage reading goes up.
Which is the idle position switch on a TP?
Some TPS incorporate a Closed Throttle Position switch (also called an idle contact switch). This switch is closed when the throttle valve is closed. At this point, the ECM measures 0 volts and there is 0 volts at the IDL terminal. When the throttle is opened, the switch opens and the ECM reads +B voltage at the IDL circuit.
What happens when my throttle position sensor goes bad?
What happens when my throttle position sensor goes bad When a TPS goes bad, then the car’s throttle body won’t function properly. It could either stay shut or it won’t close properly which is a severe issue. If it stays shut then your engine is not going receive air and it won’t start.
What is the return voltage of the TP sensor?
There are three wires attached to the TPS: power, ground and signal. Power, or reference voltage, goes into the TPS. The sensor then sends a return signal voltage to the PCM. The return voltage depends on throttle positon. Typically, the signal value at idle will be about .45 volts.
How can you tell if throttle position sensor is bad?
Below are several key signs of a bad throttle position sensor. One of the telltale signs of throttle position sensor problems is slightly delayed acceleration. If you notice a delay between the time you press on the gas pedal and the time the vehicle actually accelerates, take the car directly to a mechanic.
What happens when the throttle position sensor is bad?
A bad throttle position sensor may cause the car to unexpectedly buck or jerk around. It may also cause random surging of the engine when the car is idling.
How do I adjust the throttle position sensor?
While most throttle position sensors do not require adjustment, there are a few that do. Typically, adjustment involves connecting a voltmeter with back probe leads to the sensor signal wire and ground. Then, with the engine running, loosen the sensor screws. Rotate the sensor until the desired reading is achieved.
What is the purpose of throttle position sensor?
Purpose The throttle position sensor measures and reports the amount of throttle opening to the engine control computer. The computer uses this information to make adjustments to the mixture of fuel and air used for combustion.