DTC P0604-00: Access Error To Ram In TCM

System malfunction location	Access error to RAM in TCM
Detection condition	RAM in the TCM cannot hold/write/read data. Precondition Battery voltage is the standard or more.
Fail-safe	Inhibits AAS.
Possible cause	Control valve body malfunction (TCM malfunction) (Refer to [CONTROL VALVE BODY REMOVAL/INSTALLATION ] in service information).
Repeatability verification procedure	Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the following procedure to ensure that the DTC has been resolved: Switch the ignition ON (engine off or on).
System wiring diagram	Not applicable