DTC P0604: Internal Control Module Random Access Memory (RAM) Error: Procedure

1. Clear DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch off.
3. Disconnect the battery negative terminal and wait for 1 minutes.
4. Connect the battery negative terminal.
5. Turn the engine switch off.
6. Check DTC.

   OK

   P0604 is not present.

NG → See step   2 

OK → CHECK FOR INTERMITTENT PROBLEMS