P0643 is set when the voltage above 5.75V - maximum voltage of sensor power supply from ECM - is detected for more than 3 sec. This code is due to the short to battery in sensor power circuit or the voltage problem inside of ECM.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal check, low | 1. sensor power supply A circuit 2. ECM component |
Enable Conditions |
•
B+ : 11V ~ 16V | |
Threshold Value |
•
5V-voltage > 5.75V | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
No MIL |
