DTC P0607: Control Module Performance: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC
1. Clear DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch off.
3. Disconnect the battery negative terminal and wait for 1 minute.
4. Connect the battery negative terminal.
5. Turn the engine switch on (IG).
6. Check DTC.
  OK
  
  P0607 is not present.
NG → REPLACE ECM

OK → CHECK FOR INTERMITTENT PROBLEMS