ECM/PCM 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/PCM.
Checking ECM/PCM under detecting condition, if internal error is detected, ECM/PCM 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/PCM |
Enable Conditions |
•
7V < Battery voltage < 20V | |
Threshold Value |
•
ECM/PCM internal error (A/D unit error) | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
Immediately |
