My friend has a 1996 Cadillac deville it's not cranking changed fuel pump and battery and it's still not cranking starter good what else could it be

SOURCE: 2003 Caravan No Crank, 3.3L

This is a bad PCM. Try to disconnect the security system first and if it still does not start then it is the PCM.

SOURCE: 1996 CADILLAC DEVILLE, NO POWER TO FUEL PUMP

Check for a burned fusible link under the hood. If you have power at the fuel pump relay, you could have a bad ignition switch or bad oil pressure switch...accordianman

SOURCE: cannot locate sedan deville fuel filter

Under vehicle, driver side, below seating area, front of fuel tank, mounted on chassis in fuel lin.

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SOURCE: How to change the fuel pump on a 1997 Cadillac

THE 4.6L ENGINE YOU CAN REMOVE FUEL PUMP FROM THE TRUNK AREA. THE 4.9L ENGINES DROP FUEL TANK.YOU TO BUY A HAYNES REPAIR MANUAL YOU NEED TO SEE PHOTOS HOW TO DISCONNECT FUEL LINES AND SEE HOW TO REMOVE GAS TANK AND FUEL PUMP ASSEMBLY.

SOURCE: The car cranks fine (good battery) but will not

Hey all. I've had my 2003 in twice for the Crankshaft position sensor. In Feb 08 it fixed everything. My car wouldn't start when it had been running for a while. I'd pull into a gas station, then go to start it again and it would just turn over. Same thing just happened in July 2010. They replaced the crankshaft position sensor again, but now it's still doing the same thing. If I let the car sit for 20-25 minutes, it will start and run just fine. However, this time around the check engine light is on and it has never come on. I'm open to any suggestions as to what to try next. What is the PCM exactly?