Seville STS V8-4.6L VIN 9 (1998)
Voltage Versus Throttle Position Chart
DESCRIPTION
The TP sensor is a potentiometer that is mounted on the throttle body to measure changes in throttle valve angle.
OPERATION
The PCM provides a 5 volt reference signal and a ground to the TP sensor and the sensor in turn sends a voltage signal representing throttle position
back to the PCM. As the throttle angle increases, the voltage signal increases and as the throttle angle decreases the voltage signal decreases. A closed
throttle angle will result in a voltage signal near 0 and wide open throttle will produce a signal near 5 volts.
Intake Air Temperature Sensor (IAT)
DESCRIPTION
The IAT sensor is a thermistor (a resistor that changes value with temperature) mounted in the intake air stream and it measures changes in the
temperature of air entering the engine.
OPERATION
High air temperatures result in low resistance and low air temperatures result in high resistance. The PCM provides a 5 volt reference signal and a
ground to the IAT sensor. The PCM measures the voltage changes in the signal due to the sensors resistance. A high air temperature will result in low
signal voltage (near 0 volt) to the PCM and low air temperature will result in high signal voltage (near 5 volt).
Engine Coolant Temperature Sensor
