Diagnostic Aids
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.
Perform this test when directed by QUICK TEST. This test is only intended to diagnose the following components and circuits:
- Wiring Harness Circuit (KAPWR)
- Powertrain Control Module (PCM)
NOTE:
Installing a breakout box or disconnecting battery terminals will interrupt Keep Alive Power (KAPWR) to PCM, causing DTC P0603 to be stored in Continuous Memory.