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The powertrain control module (PCM) doesn't like the information it is getting from the ignition control module (ICM), and the PCM controls shifting, traction control, etc.If these are the only codes you are getting and the car moves, then you could assume the sensors connected to the ICM are working properly. That leaves why the PCM thinks there is a problem. I would certainly replace the ICM first, and then if the problem still exists, the PCM.
It gets power from right hand maxi fuse block , Ignition 1 fuse, 40 amp. through ignition 1 relay.
1998 Cadillac DeVille ' DeVille, Eldorado (VIN E/K) Service Manual ' Body and Accessories ' Wiring Systems ' Component Locator ' Document ID: 519143
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Engine Compartment, Near the Left Strut Tower
The fans /fans are turned on by the pcm, using input from the coolant temp sensor, as well as the HVAC system. The cts is on the right rear of the engine below the egr valve.
For 1994 Cadillac Deville 4.9L SFI 8cyl the Engine Control Computer is located front seating area, passenger side, under dash, mounted behind glove compartment cavity on firewall.
Good luck (remember to rate and comment this free answer).
Check your fuel pressure, and your spark. If you have good fuel pressure and spark, then it's probably something to do with either your ECM, ICM, or timing gear set. Autozone and O'Reilly's have a fuel pressure gauge that you can put a deposit on to use it. You can ask either if they can test your specific ICM, ECM.
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