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. Clear the DTCs. Refer DTC CHECK/CLEAR .
5. Turn the engine switch off.
6. Turn the Techstream 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).
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