1999 cadillac deville, Battery was shorted out a month prior to this problem occuring, then theft system problem displays on dash, engine will crank but not fire both the ac comp and pcm fuse are blown and when I just replace pcm fuse it will pop immediately when ign on. it had a dozen or more of error codes when checked with the on board system. These codes after clearing them out return immediately after the ign is turned on
The other modules on the vehicle have nothing to do with the PCM / ECM fuse blowing . Looking at a electrical distribution diagram to see what all the PCM/ECM fuse power's up an issolate all the thing's one at a time till the fuse doesn't blow any more . Suggest you check out a few video's on youtube on how to find a electrical short . Your best bet mite be to take it to a qualified repair shop that has the knowledge an testing equipment to diagnose this problem . Because it doesn't sound like you know much about it . All the other modules on the vehicle have their own fuse . Something the PCM/ECM power's is causing the fuse to blow . What fuse is blowing ? You don't say ? What code's did you pull an what kind of code reader did you use .
Finding active short
Electric Testing Techniques You Need to Know
ECM Inputs and Outputs Diagnosis
SOURCE: 1994 cadillace anti theft system
I just had this same problem with a '96 . do you have a vats key in your '94? you need to bypass the VATS system. read some of the blogs on this site and it will tell you how to do it. I fixed mine with a $2 resistor from radio shack.
SOURCE: shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.
Sounds like the fuel pump is shorted.
SOURCE: ECM BATT fuse keeps blowing
That fuse provides power for the fuel pump. Either your fuel pump is blowing the fuse or there is a shorted wire.
SOURCE: 1998 cadillac deville reads service ac system
Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1
SOURCE: Check engine light on, 1997 cadillac Deville.PCM codes
PO135 is oxygen sensor Bank1 sensor1. PO404 is EGR.
personally, I'd pull EGR off, clean pintle good with throttle body cleaner or carb cleaner, re-install, erase codes & try it for a while & see if it code(s) come back.
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