During the idle trouble shooting process using TunePro RT I monitored the throttle position sensor.
The value measured was “0” which indicated no measured value from the control signal pin. This particular sensor is mechanically driven. The throttle linkage on the drivers side of the throttle body adjust the TPS lever positioning. The TPS is a variable sliding potentiometer that has a +5VDC voltage on pin 3 and ground at Pin 1. While the lever is sliding along the potentiometer the voltage at Pin 2 control signal ranges from 0.5 to 4.5 volts. That’s a rough an estimated value.
After changing the TPS the measurement was correct, in the “0.59” range.
The TPS is a critical component of the fuel circuitry.