P0643 is set when the voltage in 'Power #1' circuit is above upper limit 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. APS 2 power supply circuit short 2. APT power supply circuit 3. DPS power circuit short 4. VSA position sensor power circuit short 5. EGR position sensor power circuit short 6. Faulty ECM/PCM | |
Enable Conditions |
•
IG "ON" & Engine "ON" | ||
Threshold Value |
•
Sensor power #1 error | ||
Fail Safe | Fuel Cut |
•
NO | |
EGR Off |
•
NO | ||
Fuel Limit |
•
NO | ||
Check Lamp |
•
NO | ||
