Originally Posted by gregintenn
Originally Posted by Swifty52
Originally Posted by gregintenn
Originally Posted by Hotrod_Lincoln
First, check the fuses. There's a "keep alive" circuit that provides unswitched battery voltage to the computer. Sometimes it's labeled "Gauges". If that one blows, the computer can't communicate with the serial data port (otherwise known as the scan tool plug). When you say "crank" do you actually mean "run"? Cranking means the starter is turning the engine. If the fuel pump relay isn't getting a signal from the computer or an oil pressure switch that tells it the engine is running, the fuel pump will shut off as soon as you release the key from the "start" position, and the engine will stall.
Jerry

You think that fuse is in the fuse box or somewhere else? I haven't found a bad fuse. The engine will turn over and fire, but immediately quit. I can hear the fuel pump when I turn the key on.


Your anti theft/ passlock needs to be reset.

30 MINUTE LEARN PROCEDURE
Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON (vehicle will not start).
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds .
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK). IMPORTANT: The vehicle learns the Passlock(TM) Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Start the engine. The vehicle has now learned the Passlock(TM) Sensor Data Code and/or password.

Tried that. The security light never goes off. It swaps from "Battery" to "Security" to "Low Fuel" and keeps going. Truck is full of gas before someone asks.


Communication errors.

There will be some high number codes.


I am MAGA.