Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0604 internal control module random access memory (ram) error

Subaru Legacy BN/BS (2015-2019) Service Manual / 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) Transmission Control Module (TCM)	Current condition is normal. Check for interference from noise, etc.

1. OUTLINE OF DIAGNOSIS

• Judge 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:

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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