The throttle position sensor (TPS) monitors the position of the throttle valve to inform the ECM if the engine is in idle, part throttle, or wide-open throttle. Through the voltage signal sent by the TPS, the ECM will know if there's a need to adjust and correct the air and fuel ratio. Does your vehicle stall after startup or is rough when in idle? If yes, you'd better check your throttle position sensor right away. If after testing and troubleshooting you find out that the TPS is in need of replacement, don't think twice. Below are some tips to help you find the right TPS for your ride:
What type of TPS should you get?
Though throttle sensors come in many different types, automotive throttle position sensors are offered only in two types: switch and potentiometer. To avoid compatibility problems, find out first the type and specifications of your stock sensor and look for an exact replacement.
Switch. This type of TPS features a switch that stays on to provide a continuous supply of electricity when the throttle is used. If the throttle is off, the switch will also turn off to prevent electricity from flowing.
Potentiometer. When the ignition is on but the throttle is off, this type of sensor sends very low voltage to the engine computer. It just increases the voltage as the throttle increases; the voltage can get to a peak of 5 Volts when the throttle gets to its maximum.
What other factors should you consider?
- Resistance readings
- Good construction