1997 PCED OBDII-Diesel
SECTION 5C: Pinpoint Tests

AH: Continuous Memory Failure
  AH: Introduction  

 

AH1 CONTINUOUS DTC P0603 IS SET WHEN THE PCM HAS LOST KAPWR

Was DTC P0603 present?
YesNo
GO to AH2.Intermittent failure, unable to duplicate. REPAIR other DTCs as necessary. If none, testing is complete. RESTORE vehicle. CLEAR DTCs and RETEST.
 

AH2 CHECK 5 AMP FUSE (#2 FOR F-SERIES) OR (#27 FOR ECONOLINE)

Is battery voltage present on both sides of the fuse?
YesNo
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.
 

AH3 CHECK FOR VOLTAGE TO PCM

Is B+ present?
YesNo
RESTORE vehicle; CLEAR DTC, RERUN test, If code reappears, REPLACE the PCM.REPAIR open on KAPWR circuit. RESTORE vehicle. CLEAR DTCs and RETEST.