MI SHO,
The 717 code and the 233 code fall under the catagory of "Codes NOT Listed", and are defined as "Service codes displayed are not applicable to the vehicle being tested".
This information is at the end of the list of codes for the "EEC-IV 3 Digit Codes". These two codes are not listed, and therefore do not apply to your vehicle.
If the TPS is sending a signal "higher voltage than expected" it is most likely due to a faulty sensor (code 124).
If you do not have a vacuum leak, or any other explanation for a lean condition, then the O-2 sensor has stopped "switching". It should flip-flop back and forth between rich and lean continuously. Yours stopped switching, it should be replaced (code 172).
You coolant temperature sensor is sending a signal that is higher or lower than the computer is programmed to expect. If the car is not running very hot or very cold, then the sensor is bad (code 116).
Code 216 indicates the processor (computer) detected a coil 2 primary circuit failure. Check this again. Are you sure it was a 216, and not a 116? If it is correct, you should have a noticable "Miss".
Before replacing the sensors check the sensor connections for good clean connections. Then clear the codes and rerun the tests. If the codes come back, replace the sensors.
DO NOT PULL THE ECT OUT OF A HOT ENGINE! Getting sprayed in the face with 220 degree (f) anti-freeze is most unpleasant! DO use an "O-2 sensor socket" on the O-2 sensors (about $10 at Auto Zone).
Hope this helps, rangerj