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This is a fairly old post, but in case someone finds it in a search:
You have to lock the timing in order to check it. Process for that is fairly simple. Fully warm up the car, best if you can drive it around for 10-15 minutes. Turn off all accessories/lights/hvac/etc. Shut off engine. Unplug the TPS connection, then restart the engine. Rev it to 2k twice and then let the engine settle. It should now be locked on timing and you can check & adjust with a light as expected.
If you have a consult cable and software (like NDSI or similar) there's an option to lock the timing that way, but warm engine-unplug TPS method has worked for us for many years at this point.
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