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.
Checking ECM under detecting condition, if internal error is detected, ECM sets P0606. And MIL(Malfunction Indication Lamp) turns on.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Rationality check (The internal ROM check) | 1. Poor connection 2. ECM |
Enable Conditions |
•
7V < Battery voltage < 20V | |
Threshold Value |
•
ECM internal error (A/D unit error) | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
Immediately |
