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 PCM.
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 | ● Each check sum of several blocks (Actual check sum ≠ check sum data) | |
Diagnostic Time | ||
MIL ON Condition | ● Immediately |
