If the TPS is shorted, the computer will receive the equivalent of a wide open throttle signal all the time. This will make the fuel mixture run rich and set a fault code that corresponds to a voltage signal that's too high. If the TPS is open, the computer will think the throttle i...
Trouble Code P0121...Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem Trouble Code P0122...Throttle/Pedal Position Sensor/Switch A Circuit Low Input Trouble Code P0123...Throttle/Pedal Position Sensor/Switch A Circuit High Input Trouble Code P0124...Throttle/Pedal Position...