Subaru Crosstrek Service Manual: Dtc p0604 internal control module random access memory (ram) error

Subaru Crosstrek Service Manual / Continuously variable transmission (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0604 internal control module random access memory (ram) error

CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROR

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

TCM RAM malfunction

STEP	CHECK	YES	NO

1.CHECK DTC.

1) Perform the Clear Memory Mode using the Subaru Select Monitor. Clear Memory Mode">

2) Read the DTC.

Is DTC P0604 displayed?

Replace the TCM. Transmission Control Module (TCM)">

Current condition is normal. Check for interference from noise, etc.

1. OUTLINE OF DIAGNOSIS

• Detect the malfunction in RAM area of the TCM.

• Judge as NG if an attempt to write to RAM area failed.

2. EXECUTION CONDITION

Secondary Parameters	Execution condition
12 V battery system voltage	≥ 10 V

3. 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
Writing-check (RAM) NOTE:

Malfunction Criteria

Threshold Value

Writing-check (RAM)

NOTE:

This check is carried out about the RAM only used for CAN communication.

Error

Time Needed for Diagnosis: Immediately

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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