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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 166 (Engine Control System (4GR-FSE) - Diagnostic Codes (4 Of 5)) >> SFI System >> DTC P0604: Internal Control Module Random Access Memory (RAM) Error [04/2013 - 08/2015] >> Monitor Description

Monitor Description

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. It is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standard, the ECM will illuminate the MIL and store this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0604 Internal Control Module Random Access Memory (RAM) Error ECM RAM error (1 trip detection logic). ECM Comes on DTC stored
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