Jeep Wrangler 2008 3.8 limp mode
When i start engine if i push the pedal sensor, rpm move to …,but the throtle plate not moving and still completely closing .without starting engine if i turn ignition on ,the throlte moves towards open position only 10% then it comes back to its close position.
Looks like a faulty throttle body, before ruling it out I would check power supply grounds and signal feed.... Pin 5 is PWM 12V and Pin 3 Ground to open pin 5 is PWM Ground and Pin 3 is 12V to close Voltage should move up and down as throttle is opened and closed TPS 1 will go from low to high and 2 will go from high to low the sum of the voltages from both sensors should equal 5v at any…
Edward answered this thoroughly!!! If you deduce that it is the throttle body, don't be afraid to pull the trigger! (these do fail)
If it's not physically binding, which you can check with your fingers, as long as you UNPLUG it first, then usually the ECM sees a current pattern it does not like (through the motor circuits) and concludes that it is binding. If you really enjoy playing with a scope you can current ramp those TAC motors just like any other motor. Just use a power probe to activate the motor for a split second…