| DTC P0603: | ECM Internal Control Module Keep Alive Memory (KAM) Error |
| DTC P0605: | ECM Internal Control Module Read Only Memory (ROM) Error |
| 1. | Turn the ignition switch ON (II). |
| 2. | Do the DTC CLEAR in the CLEAR MENU with the HDS. |
| 3. | Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Is DTC P0603, P0604 and/or P0605 indicated? YES - Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.n NO - Intermittent failure, system is OK at this time.n |