P0643 is set when the voltage in 'Power #1,#2,#3' circuit is above upper limit for more than 0.12 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 |
•
APS 2 power supply circuit
•
APT power supply circuit
•
DPS power supply circuit
•
ECM component | ||
Enable Conditions |
•
IG KEY "ON" | |||
Threshold Value |
•
When the voltage is above the maximum voltage of sensor power supply. | |||
Diagnostic Time |
•
100ms | |||
Fail Safe | Fuel Cut | NO | ||
EGR Off | NO | |||
Fuel Limit | YES | |||
MIL | NO | |||
