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 PCM has errors, PCM sets P0604 and MIL(Malfunction Indication Lamp) turns on.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Check internal CPU | ● Faulty PCM |
Enable Conditions | - | |
Threshold value | ● RAM has errors | |
Diagnosis Time | - | |
MIL On Condition | ● 1 driving cycle |
