Cadillac Repair: CODE F32, fuel mileage, default system

Question
92 DEVILLE SVS LIGHT COMING ON AS SOON AS ENGINE IS STARTED AND SES LIGHT COMES ON AND GOES OFF WHILE DRIVING. I HAVE CADILLAC SHOP MANUAL AND HAVE CHECKED CIRCUTS BETWEEN PCM AND BCM. THEY SEEM TO BE OK. REPLACED PCM AND BCM WITH IDENTICAL UNITS TO NO AVAIL. ENGINE RUNNING OK BUT MUST BE RUNNING ON DEFAULT SYSTEM IN PCM.  FUEL MILEAGE IS STAYING ON ZERO WHILE DRIVING. ALSO CANNOT GET PAST 7.0 ON DIO. SYSTEM WITH ENGINE RUNNING. CAN ACCESS DIO SYSTEM WHEN KEY IN ON POSITION. MANUAL SAYS CHECK FOR MATCHING BROADCAST CODES IN BCM + PCM. DIO SYSTEM SAYS 500 ON P2.5 CHECK SO HOW DO I CHECK OTHER UNIT TO SEE IF THEY ARE MATCHED???

Answer
when you get to .7.0

1. Push and release the OUTSIDE TEMP button and you will see BCM DATA F.8.0

2. push and release the HI button and you will see BCM DATA DISPLAY P.2.0

3. Keep pressing and releasing the LO button until P.3.3 displays the BCM prom I.D.


It is more likely that you got a new faulty PCM or BCM.