My 94 ls400 recently lost power and went into a limp mode. was able to get home. This occured 5 minutes after i went to jiffy lube. I checked the oil and all is fine. Check engine light came on and trac light. I am trying to activate the diagnostics and followed the published procedures used a a short wire, paper clip and can't get it into diagnostic mode. I have the car in neutral, ac off, radio off, od button pushed in. Am I missing something?