Possible Causes
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford RV Cutaway, 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, and 2003 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
- Low battery voltage.
- Charging system problem.
- Power circuit and ground circuits to PCM.
NOTE:
Battery voltage less than 9.5 volts can cause scan tool to reset. If scan tool resets during a self-test or while PID monitoring, it may be necessary to install a battery charger to maintain correct voltage.