Possible Causes
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. 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.