It doesn't seem to have any effect on timing, it's just an ECM diagnostic to let ppl know their EST wire is broken / disconnected. It would be simple enough to just disable the test in the calibration (if possible) but I'm trying to work around it electrically.
I've found that a 470 ohm resistor is enough load on this pin to prevent the code, at least while cranking. Unfortunately it pulls the voltage down enough the arduino isn't seeing the pin go high. So it might require a schmitt trigger or ???
I got a bit sidetracked trying to fix this issue and got off the task of posting the sketch. Will try to get it on github in a bit.
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