Subaru IMPREZA GD 2007 Series Manual page 2247

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CF:DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY
(RAM) ERROR
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of microcomputer (RAM). Judge as NG when the sum of all cleared RAM is not 0000
after zero-clearing all the usual RAM area in the initial routine.
2. ENABLE CONDITION
Secondary Parameters
Ignition switch
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 if the criteria below are met. Judge as OK and clear the NG if the conditions are not met.
Judgment Value
Malfunction Criteria
Sum of the RAM data after the data clear Cannot be read out.
Time Needed for Diagnosis: Undetermined
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
5. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS
• When the OK driving cycle is completed three times in a row
• When "Clear Memory" is performed
7. FAIL SAFE
None
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Enable Conditions
OFF → ON
Threshold Value
GD(STI)-180