DTC check xmission light

[Ken Kelly]

Dave,
	I have mapped out the Engine and Front Lamp harness from
the 96. It sure sounds to me like the PCM is looking for a
current draw on startup to show that the Indicator light on
the dash is working. I'll look at my harness pinout to see
if it supports an indicator lamp for the Xmission. I know
there are a few in the Instrument panel ( May be LED's not
Light bulbs), I think one is defined for Skip-shift. Don't
know what the automatic would use one for? I also have the
instrument panel from the 96 Camaro that donated my engine,
I'll see if it has any indicators. I suspect that putting a
small resistor load on the right pin would quite things
down. 

		Ken

DAVE_HEMPSTEAD at HP-Andover-om3.om.hp.com wrote:
> 
> Hi,
>    Well, I modified my scanner software, and am now able to watch on my laptop
> internal ECM memory locations while the engine is running.  I've been able to
> eliminate all but one trouble code, and I don't have the data I need to solve
> this one.
> 
>    I'm running my Impala SS '96 LT-1 engine with a '95 ECM.  I have the factory
> service manuals for the engine, but not for a '95.  The trouble code is:  Check
> Transmission Light open failure'.  I can believe this, since the '96 FSM doesn't
> list a 'Check Transmission' light anywhere that I can find.  I assume the '95
> has this light, and it hooks up to the ECM somewhere.  Since I don't have this
> attached, I can expect this trouble code.
> 
>    Can anyone tell me what plug and pin in the ECM is used for the 'Check
> Transmission' light for a '95 LT-1?????
> 
> Thanks,
> Dave Hempstead