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

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Refer to DTC CHECK / CLEAR and clear the DTCs.
5. Turn the Techstream off.
6. Turn the engine switch off.
7. Disconnect the Techstream.
8. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
9. Connect the cable to the negative (-) battery terminal.
10. Connect the Techstream to the DLC3.
11. Turn the engine switch on (IG) and wait for 16 seconds or more.
12. Turn the Techstream on.
13. Enter the following menus: Powertrain / Engine / Trouble Codes.
14. Read the DTCs.

    Result

    Result	Proceed to
    DTC is not output	A
    DTC P0604 is output	B

B → REPLACE ECM 

A → CHECK FOR INTERMITTENT PROBLEMS