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<<Which could show what ther than that there had previously been a trouble code?>>
What? If what you're saying is: "Which could show what? That there had previously been a trouble code?" Possibly. But then, the select monitor is a bit more sensitive than the internal diagnostics, therefore, would better be able to tell if there is an actual problem.
As for a "timed" response from the TCU/ECU, I don't think that's the case. My Peugeot (and many other 80's model cars) had a mechanical switch that tripped a "check engine" light at 30K mile (service) intervals. I believe those little "nag switches" were done away with by the early 90's.
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Randy Johnson
3rd Registered Member 02-21-2001
First Member to Reach 10,000 Posts
First to arrive at the very first Reading Meet
Subaru Ambassador
1992 SVX PPG Pace Car Replica 110+k
1993 White Impreza L 240+K miles
2001 Legacy Outback Limited Sedan 250+K miles
2013 Deep Indigo Pearl Legacy 3.6R 49+K miles
"Reading is my favorite Holiday"
Mike Davis -- at Reading VI
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