P0604 Internal Control Module Random Access Memory (RAM) Error
| General Description |
ECM is activated by power supply. Signals from several sensors, such as CKPS and APS, is inputted to ECM. Comparing inputted siganals with control LOGIC saved at micro controller and EEPROM, ECM controlls engine as actuating injectors, solenoids and relays. To guarantee accurate control, ECM performs SELF TEST, DIAGNOSIS of several sensors and actuators. And if serious trouble which affects vehicle performance occurrs, ECM sets DTCs. At certain cases, ECM shuts down whole systems in order to prevent dangerous situation due to incorrect control.
| DTC Description |
P0604 is set when error is detected during the test of EEPROM inside of ECM(reading or writing error happens) or leant IQA value is different from IQA value recognized at RAM. This code is due to ECM internal error(hardware inside of ECM failure).
| DTC Detecting Condition |
| Item | Detecting Condition | Possible cause | ||||||||
| Threshold value |
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| Check lamp |
engine speed fixed at 1300RPM.
engine stops immediately. ( injector driving inhibited — turning engine ON impossible ) |
Check lamp | ON | |||||||
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