P0642 is set when the voltage below 4240mV - minimum voltage of sensor power supply from ECM - is detected for more than 3sec. This code is due to the short to ground 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 |
•
Voltage is higher than 11 V and lower than 16V. | |
Threshold Value |
•
Reference voltage(5V) is lower than 4.24V | |
Diagnostic Time |
•
Continuous | |
MIL ON Condition |
•
No MIL |
