Continuous Memory Failure

1996 PCED OBDI

SECTION 18: Diesel Diagnosis — 7.3L DI Engine

AH: Continuous Memory Failure

Note: This code may have been caused by disconnecting the PCM or the Batteries.

Was DTC P0603 present?

Yes	No
Go to AH2.	Intermittent failure, unable to duplicate. REPAIR other DTCs as necessary. If none, testing is complete. RESTORE vehicle. CLEAR DTCs and RETEST.

Key off.
Measure voltage between KAPWR (MINI Fuse 2 on F-Series) or (MINI Fuse 27 on Econoline) and battery ground.

Is battery voltage present on both sides of the fuse?

Yes	No
Go to AH3.	REPAIR short to ground on Circuit 729 (R/W) for F-Series or Circuit 37 (Y) for Econoline. RESTORE vehicle. CLEAR DTCs and RETEST.

Key off.
Install breakout box, leave PCM disconnected.
Measure voltage between PCM Test Pin 55 and ground Pins 25, 51, 76, 77, 91 and 103.

Is B+ present?

Yes	No
RESTORE vehicle; CLEAR DTC, RERUN test, If code reappears, REPLACE the PCM.	REPAIR open on KAPWR circuit. RESTORE vehicle. CLEAR DTCs and RETEST.