DTC P0603: Powertrain Control Module (PCM) Keep Alive Memory (KAM) Error

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch ON (II).
Clear the DTC with the HDS.
Check for Temporary DTCs or DTCs in the PGM-FI SYSTEM with the HDS.
Is DTC P0603 indicated in the PGM-FI SYSTEM?

YES -Go to the DTC P0603 troubleshooting in the PGM-FI system (see DTC P0602: ECM/PCM PROGRAMMING ERROR ).

NO -Go to step 4.
Check for DTCs in the A/T SYSTEM with the HDS.
Is DTC P0603 indicated in the A/T SYSTEM?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time.
Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a known- good PCM (see SUBSTITUTING THE PCM ).
Turn the ignition switch ON (II).
Check for DTCs the A/T SYSTEM with the HDS.
Is DTC P0603 indicated in the A/T SYSTEM?

YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step 6. If the PCM was substituted, go to step 1.

NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see ECM/PCM REPLACEMENT ). If any other DTCs were indicated, go to the INDICATED DTC'S TROUBLESHOOTING .