The PCM controls the fuel pump based on various inputs, including the ignition switch, crankshaft position sensor, and other sensors. It doesn't have a simple on/off switch.
To troubleshoot a fuel pump issue, you should NOT try to directly access or "enable" anything within the PCM. This is a sophisticated computer that requires specialized tools and knowledge to diagnose and repair. Doing so incorrectly can cause more damage.
If you suspect a fuel pump problem (no start, weak start, sputtering), here's the proper approach:
1. Check the fuses: Start with the simplest step. Check the fuses related to the fuel pump in the fuse box (under the hood and inside the car). Your owner's manual will show you the fuse diagram.
2. Check the fuel pump relay (if applicable): Some vehicles have a separate fuel pump relay. The Crown Vic likely doesn't, but check your manual to confirm. If a relay exists, swap it with a known good one of the same amperage.
3. Have the fuel pressure tested: A qualified mechanic can use a fuel pressure gauge to determine if the fuel pump is delivering the correct pressure. This is a crucial diagnostic step.
4. Use a scan tool: An OBD-II scan tool can read diagnostic trouble codes (DTCs) from the PCM. These codes can pinpoint the source of the problem, indicating whether the PCM itself, a sensor, or the fuel pump is at fault.
5. Professional diagnosis: If you're not comfortable with auto repair, take your vehicle to a qualified mechanic. Attempting to directly interact with the PCM without proper training and equipment can lead to irreversible damage. They have the tools to diagnose the problem correctly and safely.
In short, there's no "fuel pump driver module" to enable separately; the PCM handles this function. Focus on proper diagnostic procedures instead of trying to directly manipulate the PCM.
