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Jason,
Check ground to PCM on pin "A"--check 5 volt supply on pin
"B". If you have neither, or either--check the
wiring to the PCM. If the CE light is burnt--it's part of the
circuit, and you'll need to fix that. If you have
no CE light, (could be driver circuit)--I don't have the
schematics in front of me. I just had one in the shop with
correct voltages, just couldn't get a flashed CE light or any
PCM communication--was a bad computer.
Lyndon.
What is an easy way to check to see if an ALDL
port has any data coming from it at all (if it is wired correctly etc.)? I
have a custom car I want to read the data from but a Tech 1 and a Tech 2 won't
communicate (neither will Diacom). Anything I can check with a voltmeter? What
about using the Diacom cable (parallel port) and some kind of software to see
the raw data (if any exists)? I think I might also have a serial port ALDL
cable (for some other software) that I could use.
BTW - the engine is a Cadillac Northstar engine
with a 1994 ECM (I think it is ECM part number 16197429) and a custom harness
(no Cadillac dash, no electronic throttle etc.).
Jason
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