DTC P0604: Random Access Memory (RAM): Procedure

CHECK DTC OUTPUT (DTC P0604)
1. Clear the DTC. Refer toDTC CHECK / CLEAR .
2. Turn the ignition switch off.
3. Disconnect the cable from the battery negative (-) terminal and wait for 1 minute.
4. Connect the cable to the battery negative (-) terminal.
5. Turn the ignition switch to ON.
6. Read DTC.
  OK
  
  P0604 is not present
NG → See step 3

OK → See step 2
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
REPLACE ECM. Refer to REMOVAL