Dead driver on '165?

[CSH-HQ]

I got a weirder feeling that even no MAF signal goes into back-up mode, but 
would still run, but with prolly a code.  Back-up  as I recall is a TPS/RPM
(Alpha-Speed)(Alpha-N), set up.
Grumpy


>I got a weird feeling, try a small fan blowing into the maf. Maybe
>without airflow, it won't kick the fuel on?
>
>BobR.
>
>Bob Valentine wrote:
>
>> Here's what I've got, and I'm suspecting either the injector drivers or
>> something else is fried in this ECM.  Note that I never actually ran it in
>> a car.  I've checked most of the sources for a schematic of the '165 and
>> haven't found any.  Is there one?  Again, this is '165 / ABYA (88 350 Camaro)
>>
>> My "test bench" consists of the ECM, all non-emissions related sensors
>> (except for VSS) and all 8 injectors (note I'm using Ford injectors which
>> tested ok on my 555 injector cleaner/tester).   I have the dist. hooked to
>> a variable speed motor, I've been "cranking" the motor at about 100-300 rpm
>> (dist speed) which corrolates to about 200-600 crank rpm.    MAF is hooked
>> up, park/neutral line is tied +12, FP is also hooked up.  TPS is set a .5v
>>
>> On "cranking" the FP comes on and stays on until "cranking" stops.   IAC
>> motor can be heard exercising slightly.   The injectors never fire, not
>> even once.  Swapped in a noid light, it doesn't come on either.   I have a
>> 555 VATS eliminator tied to pin B6, I've tried frequencies ranging from
>> about 20 to 40 hz (as determined by my o-scope).   With or without the VATS
>> makes no difference in the operation below.
>>
>> Everything seems fine except for the fact that the injectors don't fire.
>> The check-engine light (no scanner / aldl reader yet...) turns off
>> momemtarily while cranking, then comes back on.    ECM is setting a code
>> 34;  low MAF reading. This is to be expected since there's no airflow....
>> ;^>  I've checked for power at all sensors and the MAF - it's there and good.
>>
>> The only other thing is that the main heatsink in the ECM gets fairly warm
>> after about 10-15 minutes of power applied.   Is this normal?
>>
>> So are the injector drivers bad, or is there still something with the VATS?
>>
>> --> Bob Valentine
>> --> bob at tecmark.com
>