Test Ma: Continuous Memory Failure: Testing

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Ford RV Cutaway, 2002 Ford Pickup, 2002 Ford F550 Super Duty, 2002 Ford F450 Super Duty, and 2002 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION table of fault code setting condition.

FAULT CODE SETTING CONDITION

Fault Code	KOEO	KOER	Continuous Memory
P0603	MA1		MA1

NOTE: For additional testing information, see DIAGNOSTIC AIDS .

1) Confirm KOEO & Continuous Memory DTC P0603: Repeat Self-Test
DTC P0603 indicates a PCM Keep Alive Memory (KAM) error. Possible causes are:
- Battery Or PCM Has Been Disconnected
- Battery Cables Loose Or Poor Connection
- Battery Discharged
- Keep Alive Power (KAPWR) Circuit Open
- Blown KAPWR Fuse
- Faulty PCM
Clear DTCs. Cycle ignition off, then on. Repeat KOEO ON-DEMAND SELF-TEST under QUICK TEST. If Continuous Memory DTC P0603 is still present, go to next step. If Continuous Memory DTC P0603 is not present, no concern is indicated at this time. Service any other DTCs that are present. If no other DTCs are present, testing is complete.

2) Check Fuse

On Econoline, check fuse No. 4 (10-amp) in battery junction box. Battery junction box is located on left front of engine compartment. On Excursion and F250-550, check fuse No. 36 (10-amp) in central junction box. On F650-750, check fuse No. 13 (20-amp) in central junction box. On Excursion and F250-750, central junction box is located behind lower left side of instrument panel. On all models, if fuse is okay, go to next step. If fuse is blown, check for short to ground in Yellow wire (Econoline), Red/White wire (Excursion and F250-550) or Light Blue/Pink wire (F650-750) between blown fuse and PCM. See WIRING DIAGRAMS article. Repair wiring as necessary and replace fuse. Clear DTCs and retest.

3) Check Voltage To PCM

Turn ignition off. Disconnect PCM connector and inspect for damaged pins, corrosion and loose wires. PCM is located in left rear of engine compartment, near brake master cylinder. Repair connector as necessary. Install Rotunda Breakout Box (014-00950), leaving PCM disconnected. Using DVOM, measure voltage between chassis ground and test pin No. 55 at breakout box. If battery voltage is not present, locate and repair open in Yellow wire (Econoline), Red/White wire (Excursion and F250-550) or Light Blue/Pink wire (F650-750) between fuse and PCM. See WIRING DIAGRAMS article. Repair wiring as necessary and replace fuse. Clear DTCs and retest. If battery voltage is present, reconnect all connectors. Clear DTCs and repeat QUICK TEST . If DTC P0603 resets, replace PCM. Clear DTCs and retest.