Subaru 2006 Legacy, Manual

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GD(H4SO U5)-173
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CC:DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY
(RAM) ERROR
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of microcomputer (RAM).
When there is a problem in the main CPU normal RAM, or the sub CPU normal RAM, judge as NG. Judge
as OK when both are operating properly.
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. ENABLE CONDITION
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
Abnormality Judgment
Judge as NG when the malfunction criteria below are met.
Time Needed for Diagnosis
: Undecided
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.
Secondary Parameters Enable Conditions
None
Judgment Value
Malfunction Criteria Threshold Value
Main CPU normal RAM abnormal
Write 5AA5A55A and then read. (Whole
area of RAM) 5AA5A55A cannot be
read.
Write A55A5AA5 and then read. (Whole
area of RAM) A55A5AA5 cannot be
read.
Sub CPU normal RAM abnormal
Write 5AA5 and then read. (Whole area
of RAM) 5AA5 cannot be read.
Write A55A and then read. (Whole area
of RAM) A55A cannot be read.
Judgment Value
Malfunction Criteria Threshold Value
Main CPU normal RAM abnormal
Write 5AA5A55A and then read. (Whole
area of RAM) 5AA5A55A can be
read.
And write A55A5AA5 and then read.
(Whole area of RAM) A55A5AA5 can be
read.
Sub CPU normal RAM abnormal
Write 5AA5 and then read. (Whole area
of RAM) 5AA5 can be read.
And write A55A and then read. (Whole
area of RAM) A55A can be read.
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