PROCEDURE
(a) Reset the display settings (contrast and brightness) and check that the screen appears normal. OK: The display returns to normal.
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Toyota Tundra Service Manual > Sfi System: Random Access Memory (RAM) (P0604)
DESCRIPTION The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. This is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect the Random Access Memory (RAM) errors. If outputs from these CPUs are different and devi ...