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Home >> Subaru >> 2021 >> Legacy Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2.5L) (Diagnostics) (2 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0604: Internal Control Module Random Access Memory (Ram) Error >> General Description >> Diagnostic Method
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Diagnostic Method

Judge as NG when the following conditions are established.

JUDGMENT VALUE - DIAGNOSIS 1

Malfunction Criteria Threshold Value
Written value to RAM Not equal to the reading value
JUDGMENT VALUE - DIAGNOSIS 2

Malfunction Criteria Threshold Value
Check error of error correction code Detected

Time needed for diagnosis:  2 times

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.