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car off, close doors, start car w/EATC off, hold both offand floor buttons simultaneously, release both buttons and press automatic button w/in 2 secs. self test will begin, takes about 2 mins. If all lights come on, unit is probably good. If a code appears, need to check if unit is bad. If unit is good, it's probably a vacuum problem. Not an expert, just have a similar problem. I'm looking for a vacuum diagram to trouble shoot leak in system for 2006 Grand Marquis.

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Q: What Eatc Self Test Procedure grand marquis?
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