It's in theft mode. Unlock the front doors with the key or key fob if it has remote keyless entry. If your car does not have factory anti-theft system, a voltage spike has confused a computer into thinking it is on the car, and it self-programmed itself to need the disarm signal. Either the Body Computer or the Engine Computer can do this and, (this is important), one computer will teach it to the other one. This upgrade programming can not be undone. BOTH computers must be replaced at the same time. If you find used ones in the salvage yards, they must both come from cars that didn't have the factory anti-theft system. (The two old computers will work fine in a different car that does have the factory anti-theft system).
If you install just the Engine Computer first, as soon as you turn on the ignition switch, it will learn the anti-theft programming from the Body Computer. Next when you put the new Body Computer in, it will be upgraded by the Engine Computer when you turn on the ignition switch. You absolutely must install both computers at the same time before you turn on the ignition switch, and they must both not be programmed for the security system.
Remember, that only applies if your car didn't come with the factory anti-theft system. If it is on your car, it isn't disarming and you should see the yellow "Theft System" light flashing on the left side of the dash. Failure to disarm could be caused by a disconnected link between the switch and the lock cylinder in the door. It should disarm from the passenger front door too. Another possible cause is broken and frayed wires in the harness between the door hinges.
None of the parts listed will cause this problem. You will never solve a running problem on a Chrysler car by replacing the fuel filter, a high-mileage fuel pump might fail to start, but it will rarely stop once it's running. Regulator problems are real common on GM cars and trucks but never on a Chrysler.
No idea how to get diagnostic fault codes with a scope. Chrysler's method is WAY easier than any other brand of car. Just sit in the seat and cycle the ignition switch three times in five seconds.
One thing you should be aware of; every time you disconnect the battery, engine data is lost from the Engine Computer's memory. The engine will not idle without stalling until you relearn minimum throttle. It is also normal for engine speed to go to around 1500 rpm at startup, then drop to a normal 800 rpm within two to three seconds. Failure to do this "idle flare-up" is another indication minimum throttle must be releaned. To do that, drive at highway speed with the engine wamed up, then coast for at least seven seconds without touching the brake or gas pedals. Once you do that, the computer will know when it must be in control of idle speed.
Friday, January 29th, 2010 AT 2:47 AM