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

Subaru Legacy Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0604 internal control module random access memory (ram) error

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Engine does not start.

Engine stalls.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

STEPCHECKYESNO

1.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed-

Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)

Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of microcomputer (RAM).

When there is a problem in the CPU normal RAM, judge as NG.

If it is possible to write data to the whole area of RAM in the initial routine, and is possible to read the same data, it is judged as OK, and if not, NG.

2. EXECUTION CONDITION

Secondary Parameters

Execution condition

None

Diagnosis with the initial routine.

3. GENERAL DRIVING CYCLE

Perform the diagnosis as soon as the ignition switch is turned to ON.

4. DIAGNOSTIC METHOD

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

Written value to RAM

≠ Read out value

Time Needed for Diagnosis: 32 ms - 16 time(s)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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DTC DETECTING CONDITION:Immediately at fault recognitionTROUBLE SYMPTOM:Failure of engine to startCAUTION:After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPER ...

Other materials:

Disassembly
1. Remove the reservoir tank.CAUTION:Be careful not to tighten a vise excessively.(1) Place the master cylinder assembly between aluminum plates and fix it on a vise.(2) Drive out the pin using a punch and a hammer to remove the reservoir tank.2. Remove the seal from the cylinder body assembly. ...

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