There is. If you google Jeep Adventures under the hood and then go to the stepper motor link he'll show you the sequence to apply power to test it. It should move in and out without forcing it.
Basically, when the car is started, the motor should move the pins all the way into the carb and then back them out to their halfway position. This is called the initialization step. It's in the TSM. If it does that you should be set. If you still had issues I would look to the o2 sensor or wiring. During warmup the pins should stay still at a preset place. Once warm, the computer goes closed loop and the pins will cycle in and out based on the signal from the o2 sensor. There are a few temp sensors that need to work (one in front side of intake and one in air cleaner) to tell the computer to enter closed loop. That under the hood site explains all of this. However I have to actually crank my Eagle to get it to initialize. On jeeps you can turn the key to run to see it. It happens quick so have someone else start it while you watch the stepper pins. On later Eagles like after 83-84, the distributor needs to generate a tach signal at cranking RPMs for the computer to wake up.
Hope that helps!
Topic: Symptoms/testing bad stepper motor? (Read 1950 times)