code 41 or 25: tps signal abnormal
Throttle position sensor signal does not agree with manifold pressure sensor signal.
The Throttle Sensor responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the Throttle Valve position into output voltage, and emits the voltage signal to the ECU. In addition, the sensor detects the opening and closing speed of the Throttle Valve and feeds the voltage signal to the ECU.
Throttle Position Sensor(TPS)/Accelerator Pedal Position Sensor(APPS) signal voltage high.
Test the Throttle Position Sensor. Just google "How to test Throttle Position Sensor 1998 Cavalier". The code is for a TP sensor, Low Input. Try unplugging it and plugging it back up. Repair manuals walk you through the testing. Go here if you can. (an easy walkthrough) The Throttle Position (TP) sensor is a potentiometer that provides a signal to the PCM that is directly proportional to the throttle plate position. The TP sensor is mounted on the side of the throttle body and is connected to the throttle plate shaft. The TP sensor monitors throttle plate movement and position, and transmits an appropriate electrical signal to the PCM. These signals are used by the PCM to adjust the air/fuel mixture, spark timing and EGR operation according to engine load at idle, part throttle, or full throttle. The TP sensor is not adjustable. The TP sensor receives a 5 volt reference signal and a ground circuit from the PCM. A return signal circuit is connected to wiper that runs on a resistor internally on the sensor. The further the throttle is opened, the wiper moves along the resistor, at wide open throttle, the wiper essentially creates a loop between the reference signal and the signal return returning the full or nearly full 5 volt signal back to the PCM. At idle the signal return should be approximately 0.9 volts. You maybe starting to have trouble with the "wiper". maybe..... TP sensor is $30 @ AZ ....
A Throttle Position Sensor (TPS) reports to the ECM how open the throttle is. The signal is sent as voltage to the ECM, and the amount of voltage reports how open the throttle is. The throttle is what allows gasoline to get to the engine, and in a car that is the gas pedal. We would think fo the value as 0% to 100% and any range between.
Throttle position (TP) sensor circuit, very low signal voltage.
A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).
They are all somewhat the same. You have a drive by wire system. (no cable-a radio signal is used to tell comp gas pedal and throttle position and maintain relationship) This is on your throttle body on one side the other moves the blade. This sensor tell the computer the position of the blade in your throttle body.
code 51 is a switch condition signal diagnosis no IDL signal or A/C signal to the ecm when the test connector E1 and TE1 are connected probable cause A/C switch or circuit A/C amplifier neutral start switch (A/T) throttle position sensor throttle position sensor circuit to fix i am not sure what one is wrong but i gave you what it is by my code book
My Haynes repair manual shows : It senses throttle movement and position , then transmits a voltage signal to the PCM . This signal enables the PCM to determine when the throttle is closed , in a cruise position , or wide open . A defective TPS can cause surging , stalling , rough idle and other driveability problems because the PCM thinks the throttle is moving when it is not .
If the TPI (throttle position sensor) is bad, you will have a fault code set in the computer. To check it, with a scope, graph the signal while opening/closing the throttle. The signal should be a smooth wave, if there are any dips, the sensor should be replaced. The contact can wear in the position the blades are at during normally driving, especially if you many due highway constant speed driving.
The map sensor measures intake manifold vacuum . The signal is varied from high to low, this voltage signal change along with the throttle position sensor,vehicle speed sensor, o2 sensor, the computer uses the signals to vary injector pulse width.