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 the ECM has an errors or the CPU software version does not match the main CPU or real checksum does not match with the memory checksum, ECM sets P0605.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Check internal CPU, RAM |
•
Faulty ECM |
Enable Conditions |
•
- | |
Threshold value |
•
RAM has errors
•
Discordance between the real checksum and the memorized checksum
•
The version discordance among PCU S/W or Calibration | |
Diagnosis Time |
•
Continuous | |
MIL On Condition |
•
1 driving Cycle |
