Possible Causes:
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
- Battery cables
- Low battery voltage
- Charging system problem
- Power circuit and ground faults to the PCM
- PCM relay
GO to PINPOINT TEST A: VEHICLE BATTERY to diagnose a voltage concern.
NOTE:
Battery voltage below 9.5 volts may cause the scan tool to reset. If the scan tool resets during a self-test or while PID monitoring, it may be necessary to install a battery charger to maintain correct system voltage.