P0604 (U5/Low Emissions)
DTC P0604 - INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROROUTLINE OF DIAGNOSIS
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.
ENABLE CONDITION
Perform the diagnosis in the initial routine.
GENERAL DRIVING CYCLE
Perform the diagnosis immediately after IG key SW is turned ON.
DIAGNOSTIC METHOD
- Abnormality Judgment
Judge NG when the malfunction criteria are completed.
- Normality Judgment
Judge NG when the malfunction criteria are completed.
DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
FAIL SAFE
None
ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)