A malfunction is detected by using a checksum technique for verifying data. The digital data is composed of zeros and ones. A checksum is the total of all ones in a string of data. By comparing the checksum value with a stored value, a malfunction can be detected.
If the RAM in ECM has errors, ECM sets P0604 and MIL(Malfunction Indication Lamp) turns on.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Check internal CPU | 1. Faulty ECM |
Enable Conditions |
•
- | |
Threshold value |
•
RAM has errors | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
1 driving cycle |
