strange check engine light

[monte vogt]

I did this same thing with my stock Memcal, somehow I popped the damn thing
when I was reading it with my programmer. I bought a new one at dealer and
all is well. I don't understand how going to FSM would make the car run
right, but I did it for a week.

Monte

At 02:33 AM 12/14/2000, you wrote:
>
>
>>Ok, I've got a problem I haven't seen here before. I had to transfer the 
>>ESC
>>and netres chips from a "bad" 27256 memcal to a good memcal. When I crank 
>>the
>>engine, the SES light comes on rather quick and the engine idle is way up
>>there. Sounds like the idle air control is wide open with all the hissing.
>
>This sounds like back up fuel mode.
>
>
>>When I install the field service mode jumper between ALDL A and B (engine
>>running), the light goes out and the idle drops to normal. I remove the
>>jumper and it runs fine from then on until the next crank. The code I get 
>>is
>>code 51, which I believe is an EPROM code.
>
>Yep.
>
>
>What does putting it in field
>>service mode have to do with code 51 and why does it fix it.  This is a
>>strange one.  JW
>
>
>I don't know what field service mode and backup fuel have to do with each 
>other.  But I think if you check your soldering you'll find the problem.
>
>Jeremy
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