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 or CPU software version dose not accord with main CPU or real checksum does not accord with 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 | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
1 driving cycle |
