P0643 is set when the voltage above 5158mV - maximum voltage of sensor power supply 1 generates from ECM - is detected for more than 0.1 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 |
•
Voltage monitoring | 1. Sensor 1 (VSA, EGR, ACV, CRUISE, APS2) power supply circuit 2. ECM component | ||
Enable Conditions |
•
IG key ON | |||
Threshold Value |
•
When the voltage is above the maximum voltage (5158mV ) of sensor power supply. | |||
Diagnostic Time |
•
0.1 sec. | |||
Fail Safe | Fuel cut | NO |
•
Limp home mode is activated. (Engine speed is fixed at approx. 1200RPM ) | |
EGR Off | NO | |||
Fuel Limit | YES | |||
Check Lamp | OFF | |||
