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Home >> Toyota >> 2025 >> GR86 Base, Automatic Trans >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission System - Diagnostic Codes (1 Of 2) >> Automatic Transmission System >> DTC P0604: Internal Control Module Random Access Memory (RAM) Error [11/2021 - ] >> Monitor Description
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Monitor Description

OUTLINE OF DIAGNOSIS 

Detect the malfunction in RAM area of the TCM.

EXECUTION CONDITION 

Secondary parameters Execution condition
12 V battery system voltage 6.5 V or more

DIAGNOSTIC METHOD 

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment value 

Malfunction Criteria Threshold Value
Written data in RAM Not read data

Time needed for diagnosis 

Immediately Continuous

Malfunction indicator light illumination 

Illuminates as soon as a malfunction occurs.