Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

REPLACE ECM
1. Clear DTC.
2. Turn the ignition switch OFF.
3. Disconnect the battery negative terminal and wait for 1 minutes.
4. Connect the battery negative terminal.
5. Turn the ignition switch ON.
6. Check DTC.
  OK:
  
  P0604 is not present.
NG: REPLACE ECM

OK : CHECK FOR INTERMITTENT PROBLEMS