DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROR
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DTC P0604 INTERNAL CONTROL MODULE RANDOM
ACCESS MEMORY (RAM) ERROR
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Detect the function abnormality of the micro-computer
(RAM).
Judge NG when either the main CPU normal
RAM or sub CPU normal RAM is abnormal. Judge OK when both of them
are normal.
At initial routine, write the data to all
area of RAM. Judge OK when same data can be read out, and judge
NG when same data cannot be read out.
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Secondary
Parameters
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Enable
Conditions
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None
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Perform the diagnosis in the initial routine.
Perform the diagnosis immediately after IG
key SW is turned ON.
Abnormality Judgment
Judge NG when the malfunction criteria below
are completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Main
CPU normal RAM abnormality
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Write
5AA5A55A, and read out. (All area of RAM)
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Cannot
be read out 5AA5A55A.
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Or
write A55A5AA5, and read out. (All area of RAM)
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Cannot
be read out A55A5AA5.
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Sub
CPU normal RAM abnormality.
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Write
5AA5, and read out. (All area of RAM)
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Cannot
be read out 5AA5.
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Or write
A55A, and read out. (All area of RAM)
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Cannot
be read out A55A.
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Time Needed for Diagnosis:
To
be determined.
Malfunction Indicator
Light Illumination:
Illuminates as soon as malfunction occurs.
Normality Judgment
Judge NG when the malfunction criteria below
are completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Main
CPU normal RAM abnormality
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Write
5AA5A55A, and read out. (All area of RAM)
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Cannot
be read out 5AA5A55A.
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Or
write A55A5AA5, and read out. (All area of RAM)
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Cannot
be read out A55A5AA5.
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Sub
CPU normal RAM abnormality.
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Write
5AA5, and read out. (All area of RAM)
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Cannot
be read out 5AA5.
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Or write
A55A, and read out. (All area of RAM)
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Cannot
be read out A55A.
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•
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When the OK idling cycle was completed 40 times
in a row
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•
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When “Clear Memory” was
performed
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MALFUNCTION
INDICATOR LIGHT CLEAR CONDITION
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When the OK driving cycle was completed 3 times
in a row
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When “Clear Memory” was
performed
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None
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
