ECM monitors errors through checksum. Every information consists of the combination of 0 and 1, checksum means summing up all values in a row. Thus, errors are recognized comparing checksum value and the memory value at ECM.
ECM detects the signal exchages between micro-processor and sensor/actuator.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Rationality check (The internal ROM check) |
•
Poor connection
•
ECM |
Enable Conditions |
•
- | |
Threshold Value |
•
Check sum fault (ROM) | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
2 driving cycle |
