DTC P0604:00: Notes

DTC P0604:00	PCM RAM error
DETECTION CONDITION	PCM internal RAM malfunction. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Stops the idle air control. Stops the drive-by-wire control and sets to a throttle valve opening angle necessary for the minimum driveability.
POSSIBLE CAUSE	PCM internal RAM malfunction
SYSTEM WIRING DIAGRAM	-