Chrysler Repair: Idle/Electrical problem with a 2000 T&C van, throttle position sensor, town and country chrysler

Question
I have a 2000 town and country Chrysler van. I just had the transmission rebuilt. The problem now the car is hard to start but when it does it is only on low idle. When you give it the gas it stops. I had it check out and the reading they got PO122 TPS, PO1492 voltage to low and PO106 Map sensor. I installed a new map sensor but no results. I did a switch voltage reading on various components, and the voltage is low not to specks. Could it be my PCM board and how do I check it. Can I go around the PCM board? Thanks Gragg

Answer
Hi Gragg,
The throttle position sensor or its wires are probably what is causing your idle problem and/or you would do well to clean out the throat of the throttle body, both sides of the throttle plate, and the idle air by-pass on the side of the throttle throat. You can test the throttle position sensor by measuring the resistance between the center pin and either side pin and move the throttle lever, observing if the resistance reading varies smoothly and continuously from closed to open. If not, then I would replace the throttle position sensor located on the side of the throttle body.
The ambient temp sensor voltage is related to the battery temperature (that is to say in the vicinity of the battery/pcm) and it impacts the voltage setting of alternator when charging the battery only. If the battery is being kept charged I would not worry about that code.  I believe that the ambient sensor is built-in to the PCM board so you would have to replace the pcm to correct the 1492 code. I doubt that temp sensor impacts the idle speed issue. So focus on the throttle position issue first.
Roland