Miata Mailing List: December 1997, Message #123
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From: 	Robert Ullrich <rullrich@ssl.berkeley.edu>

Subject: Re: Check Engine Light Resolved

Date: 	Mon, 1 Dec 1997 20:17:51 +0000



At 07:09 PM 01-12-97 +0000, Chuck Harris wrote:

>A few weeks ago I posted a message to the list about my check engine light

>staying on.  .......

>My baby is a '97 Touring Package, but I wanted cruise control, so the dealer

>sent the car to a local shop that does that sort of work and had it

>installed.  Apparently, there is a switch on the clutch that disengages the

>cruise control when the pedal is depressed.  The shop connected the switch

>incorrectly, and the check engine light lit up as a result.  The

>still-unexplained part of this is why the light never came on _while_ I was

>using the cruise control, but rather a day or two later, but it seems to be



Perhaps the answer lies in the way the OBDII is supposed to work.  The MIL

(malfunkshun indicator light) doesn't turn on until it senses the problem 3

times in a certain period of time of operation. I don't remember what it is

supposed to be tho'.  so it would have to occur 3 times in a weird time

period to make it light up.  Hence the observed delay.





>From the Kalevala

Robert Ullrich