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PO122 is a Throttle Position Sensor An APPor ETC is the pedal position sensor which is the gas pedal,all shop know that one Remember the Toyota issues a few years back NASA found nothing wrong with them Don't think you have drive by wire in 1996 Your saying no one can look up a Code,odd isn't that You can Google any codes you ever get & read for months
The camshaft position sensor (also known as the distributor pickup) is inside the distributor which is driven by the camshaft gear and directly below the water pump, the water pump must be removed to access the distributor to change the sensor. Here is a picture of the camshaft position sensor.
The Engine Control Unit continuously receives information from sensors on the cam and crank shafts. This code indicates that there was an intermittent loss of signal from one or other of these sensors due to a sensor fault or a loose connection. If the fault persists the ECU will loose track of the relative position of the crank and cam and this will give rise to erratic engine firing. Try thoroughly cleaning the contacts within the electrical connectors to these sensors and see if this resolves the issue.
if you are referring to the CPS camshaft position sensor, it doesn't appear that your engine has one. my auto parts store catalog says that it has no info for that part. I have a 95 chevy van with a 5.7 and it doesn't have a cps..........
look on the head, at the front of the head there is a little sqare plastic housing with a circular out crop, and 2 to 4 wires clipped to it.(could bo on the rear of the head as well check there as well.)
I would be thinking that there is a good chance that you need to be checking out replacing the computer, if you aren't getting any communication with the proper scan tool then the computer isn't communicating with anything in the vehicle...... I would have guessed first off that the ignition control module might be bad but that is obviously part of the computer also, I would be looking in that direction.