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DTC P0604-00: Pcm Ram Error: Notes

DETECTION CONDITION AND POSSIBLE CAUSE

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 
  • Restricts the upper limit of the engine speed.
  • Stops the idle air control.
  • Stops the drive-by-wire control and sets throttle valve opening to a necessary angle for minimum driveability.
POSSIBLE CAUSE 
  • PCM connector or terminals malfunction
  • PCM internal RAM malfunction
SYSTEM WIRING DIAGRAM  -
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